diff --git a/step21_web3_node_getbalance/.gitignore b/step21_web3_node_getbalance/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step21_web3_node_getbalance/.gitignore
+++ b/step21_web3_node_getbalance/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step21_web3_node_getbalance/EthereumAccount.ts b/step21_web3_node_getbalance/EthereumAccount.ts
index 73faccc..c2ea7f3 100644
--- a/step21_web3_node_getbalance/EthereumAccount.ts
+++ b/step21_web3_node_getbalance/EthereumAccount.ts
@@ -1,23 +1,37 @@
-import Web3 from 'web3';
+import Web3 from "web3";
+
+// Create a new project on Infura and replace PROJECT_ID
+// in the following line with your Infura project id.
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/PROJECT_ID";
 
 //https://www.typescriptlang.org/docs/handbook/2/classes.html
 export class EthereumAccount {
+  private web3: Web3;
+  private address: string;
 
-    private web3: Web3;
-    private address: string;
-   
-    // Got an Default Account Address from Etherscan: https://etherscan.io/accounts
-    public constructor(address: string = "0xDeE6238780f98c0ca2c2C28453149bEA49a3Abc9") {
-        this.address = address;
-        this.web3 = new Web3("https://mainnet.infura.io/v3/b56ef5c27bca4880844888e6a12a16ef");
-        
-    }
+  /**
+   * Instantiate an Ethereum Account object.
+   * @param address Public address of the account on Ethereum Network.
+   */
+  public constructor(address: string) {
+    this.address = address;
+    this.web3 = new Web3(RPC_ENDPOINT);
+  }
 
-    public getAddress(): string {
-      return this.address;
-    }
+  /**
+   * Get the public address of the Ethereum account.
+   * @returns public address of the Ethereum account.
+   */
+  public getAddress(): string {
+    return this.address;
+  }
 
-    public async getBalance() {
-      return await this.web3.eth.getBalance(this.address);
-    }
-  }
\ No newline at end of file
+  /**
+   * Get the number of Ethers in the Ethereum account.
+   * @returns Ethers (ETH) in the Ethereum account.
+   */
+  public async getBalance() {
+    const balance = await this.web3.eth.getBalance(this.address);
+    return this.web3.utils.fromWei(balance, "ether");
+  }
+}
diff --git a/step21_web3_node_getbalance/index.ts b/step21_web3_node_getbalance/index.ts
index 7c4d97d..ff9d043 100644
--- a/step21_web3_node_getbalance/index.ts
+++ b/step21_web3_node_getbalance/index.ts
@@ -1,8 +1,18 @@
-import { EthereumAccount } from './EthereumAccount';
+import { EthereumAccount } from "./EthereumAccount";
 
-const account : EthereumAccount = new EthereumAccount();
-
-account.getBalance().then(response => console.log(response));
+const numberFormator = new Intl.NumberFormat("us-EN", {
+  style: "currency",
+  currency: "ETH",
+});
 
+// Get any Account Address from Etherscan: https://etherscan.io/accounts
+const accountAddress = "0x53d284357ec70ce289d6d64134dfac8e511c8a3d";
 
+(async () => {
+  // Instantiate an Ethereum account instance.
+  const account = new EthereumAccount(accountAddress);
 
+  console.log("Account Address:", account.getAddress());
+  const balance = await account.getBalance();
+  console.log("Account Balance:", numberFormator.format(+balance));
+})();
diff --git a/step21_web3_node_getbalance/package-lock.json b/step21_web3_node_getbalance/package-lock.json
index 90f79cf..3d46fca 100644
--- a/step21_web3_node_getbalance/package-lock.json
+++ b/step21_web3_node_getbalance/package-lock.json
@@ -1,5423 +1,8 @@
 {
   "name": "step21_web3_node_getbalance",
   "version": "1.0.0",
-  "lockfileVersion": 2,
+  "lockfileVersion": 1,
   "requires": true,
-  "packages": {
-    "": {
-      "version": "1.0.0",
-      "license": "ISC",
-      "dependencies": {
-        "web3": "^1.5.2"
-      },
-      "devDependencies": {
-        "@types/node": "^12.20.19",
-        "nodemon": "^2.0.12",
-        "ts-node-dev": "^1.1.8",
-        "tslint": "^6.1.3"
-      }
-    },
-    "node_modules/@babel/code-frame": {
-      "version": "7.14.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
-      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
-      "dev": true,
-      "dependencies": {
-        "@babel/highlight": "^7.14.5"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.14.9",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
-      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
-      "dev": true,
-      "engines": {
-        "node": ">=6.9.0"
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-    },
-    "node_modules/@babel/highlight": {
-      "version": "7.14.5",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
-      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
-      "dev": true,
-      "dependencies": {
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-        "chalk": "^2.0.0",
-        "js-tokens": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@ethereumjs/common": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.4.0.tgz",
-      "integrity": "sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==",
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-      "dependencies": {
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-      }
-    },
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-        "@ethersproject/bignumber": "^5.0.7",
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-        "@ethersproject/logger": "^5.0.5",
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-        },
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-          "type": "individual",
-          "url": "https://www.buymeacoffee.com/ricmoo"
-        }
-      ],
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-        "@ethersproject/bytes": "^5.4.0",
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-        "@ethersproject/networks": "^5.4.0",
-        "@ethersproject/properties": "^5.4.0",
-        "@ethersproject/transactions": "^5.4.0",
-        "@ethersproject/web": "^5.4.0"
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     "@babel/code-frame": {
       "version": "7.14.5",
@@ -8572,21 +3157,6 @@
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@@ -8616,6 +3186,21 @@
         "define-properties": "^1.1.3"
       }
     },
+    "string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "requires": {
+        "safe-buffer": "~5.2.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        }
+      }
+    },
     "strip-ansi": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
@@ -8933,13 +3518,6 @@
         "is-typedarray": "^1.0.0"
       }
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-    "typescript": {
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diff --git a/step21_web3_node_getbalance/package.json b/step21_web3_node_getbalance/package.json
index b431ee6..10c58e2 100644
--- a/step21_web3_node_getbalance/package.json
+++ b/step21_web3_node_getbalance/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "Zia Khan",
   "license": "ISC",
diff --git a/step21_web3_node_getbalance/readme.md b/step21_web3_node_getbalance/readme.md
index aceb38f..c1c31e2 100644
--- a/step21_web3_node_getbalance/readme.md
+++ b/step21_web3_node_getbalance/readme.md
@@ -1,29 +1,84 @@
-# Web3.js Introduction: Get Balance
+# Step21: Web3.js Introduction: Get Balance
 
-[Watch Intro](https://www.youtube.com/watch?v=t3wM5903ty0)
+## References
 
-[Read the #1 of this Tutorial](https://www.dappuniversity.com/articles/web3-js-intro)
+1.  [Watch Intro](https://www.youtube.com/watch?v=t3wM5903ty0)
+2.  [Read the #1 of this Tutorial](https://www.dappuniversity.com/articles/web3-js-intro)
 
-[Install Node 14+ LTS](https://nodejs.org/en/)
+## Prerequisites
 
+1.  Install [Node 14+ LTS](https://nodejs.org/en/download/)
+2.  Install TypeScript globally with the following command:
+
+```bash
 npm install -g typescript
+```
+
+## Step 1
 
+Initialize a `package.json` file.
+
+```bash
 npm init
+```
+
+Add the following scripts in the `package.json`.
 
-npm install @types/node nodemon ts-node-dev tslint  --save-dev
+```json
+"scripts": {
+  "test": "echo \"Error: no test specified\" && exit 1",
+  "start": "ts-node-dev --respawn index.ts"
+}
+```
 
+Install the required npm packages.
+
+```bash
 npm install web3
+```
+
+```bash
+npm install @types/node nodemon ts-node-dev tslint --save-dev
+```
+
+## Step 2
 
 [Create tsconfig.json](https://stackoverflow.com/questions/61305578/what-typescript-configuration-produces-output-closest-to-node-js-14-capabilities/61305579#61305579)
 
 [Web3 usage with TypeScript](https://github.com/ChainSafe/web3.js#usage-with-typescript)
 
-create index.ts and EthereumAccount.ts
+## Step 3
 
-[Signup with Infura and create an Ethereum Project and get the url and put it in EthereumAccount.ts](https://infura.io/)
+Create `index.ts` and `EthereumAccount.ts` files.
 
-npm start
+## Step 4
 
+Signup on [Infura](https://infura.io/), create a new project, and replace `PROJECT_ID` in `EthereumAccount.ts` with your Infura project ID.
 
+```ts
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/PROJECT_ID";
+```
+
+## Step 5
+
+Copy any account's public address from [EtherScan](https://etherscan.io/accounts). Paste the address in `index.ts`. Or you can leave the address as it is.
+
+```ts
+const accountAddress = "0x53d284357ec70ce289d6d64134dfac8e511c8a3d";
+```
+
+## Step 6
+
+Run the project with the following commands:
+
+```bash
+npm link typescript
+npm start
+```
 
+or with these commands.
 
+```bash
+tsc
+node index
+```
diff --git a/step21_web3_node_getbalance/tsconfig.json b/step21_web3_node_getbalance/tsconfig.json
index 07d2004..a24a581 100644
--- a/step21_web3_node_getbalance/tsconfig.json
+++ b/step21_web3_node_getbalance/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step21_web3_node_getbalance/tslint.json b/step21_web3_node_getbalance/tslint.json
index 24388b8..a64df52 100644
--- a/step21_web3_node_getbalance/tslint.json
+++ b/step21_web3_node_getbalance/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step22_web3_smartcontract_read_data/.gitignore b/step22_web3_smartcontract_read_data/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step22_web3_smartcontract_read_data/.gitignore
+++ b/step22_web3_smartcontract_read_data/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step22_web3_smartcontract_read_data/ERC20Token.ts b/step22_web3_smartcontract_read_data/ERC20Token.ts
new file mode 100644
index 0000000..85ec82b
--- /dev/null
+++ b/step22_web3_smartcontract_read_data/ERC20Token.ts
@@ -0,0 +1,50 @@
+import { SmartContract } from "./SmartContract";
+
+export class ERC20Token extends SmartContract {
+  /**
+   * Get the name of the token mentioned in its smart contract.
+   * @returns name of the token.
+   */
+  public async getTokenName() {
+    return await this.contract.methods.name().call();
+  }
+
+  /**
+   * Get the symbol of the token mentioned in its smart contract.
+   * @returns symbol of the token.
+   */
+  public async getTokenSymbol() {
+    return await this.contract.methods.symbol().call();
+  }
+
+  /**
+   * Get the number of decimal places when representing DAIs.
+   * @returns number of decimal places.
+   */
+  public async getNumDecimals() {
+    return await this.contract.methods.decimals().call();
+  }
+
+  /**
+   * Get total number of tokens minted.
+   * @returns total supply of the token in the market.
+   */
+  public async getTotalSupply() {
+    const totalSupply = await this.contract.methods.totalSupply().call();
+    const numDecimals = await this.getNumDecimals();
+    return totalSupply / 10 ** numDecimals;
+  }
+
+  /**
+   * Get the number of tokens held by an account.
+   * @param accountAddress public address of the account.
+   * @returns number of tokens held by the provided account.
+   */
+  public async getAccountBalance(accountAddress: string) {
+    const balance = await this.contract.methods
+      .balanceOf(accountAddress)
+      .call();
+    const numDecimals = await this.getNumDecimals();
+    return balance / 10 ** numDecimals;
+  }
+}
diff --git a/step22_web3_smartcontract_read_data/SmartContract.ts b/step22_web3_smartcontract_read_data/SmartContract.ts
index 3843c33..317b2ca 100644
--- a/step22_web3_smartcontract_read_data/SmartContract.ts
+++ b/step22_web3_smartcontract_read_data/SmartContract.ts
@@ -1,42 +1,34 @@
-import Web3 from 'web3';
-import EthContract from 'web3-eth-contract';
+import Web3 from "web3";
+import EthContract from "web3-eth-contract";
 
-export class SmartContract {
-    private static readonly DAI_ADDRESS: string = '0x6B175474E89094C44Da98b954EedeAC495271d0F';
-    private static readonly DAI_ABI: string = '[{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"guy","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"dst","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"move","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"holder","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"bool","name":"allowed","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"pull","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"push","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]';
-    
-    private web3: Web3;
-    private contractAddress: string;
-    private abi: string;
-    private contract: EthContract.Contract;
-   
-    // Got an Default Smart Contract Address from Etherscan: https://etherscan.io/accounts
-    public constructor(contractAddress: string = SmartContract.DAI_ADDRESS, abi: string = SmartContract.DAI_ABI) {
-        this.contractAddress = contractAddress;
-        this.abi = abi;
-        this.web3 = new Web3("https://mainnet.infura.io/v3/your_account_number");
-        this.contract = new this.web3.eth.Contract(JSON.parse(this.abi), this.contractAddress);
-    }
-
-    public getContractAddress(): string {
-      return this.contractAddress;
-    }
-
-    public async getContractName() {
-      return await this.contract.methods.name().call();
-    }
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/INFURA_PROJECT_ID";
 
-    public async getContractSymbol() {
-      return await this.contract.methods.symbol().call();
-    }
-
-    public async getTotalSupply() {
-      return await this.contract.methods.totalSupply().call();
-    }
+export class SmartContract {
+  protected web3: Web3;
+  protected contractAddress: string;
+  protected abi: string;
+  protected contract: EthContract.Contract;
 
-    
-    public async getAccountBalance(accountAddress: string) {
-      return await this.contract.methods.balanceOf(accountAddress).call();
-    }
+  /**
+   * Object representing a contract on Ethereum.
+   * @param contractAddress address of the contract on Ethereum network.
+   * @param abi ABI of the contract.
+   */
+  public constructor(contractAddress: string, abi: string) {
+    this.contractAddress = contractAddress;
+    this.abi = abi;
+    this.web3 = new Web3(RPC_ENDPOINT);
+    this.contract = new this.web3.eth.Contract(
+      JSON.parse(this.abi),
+      this.contractAddress
+    );
+  }
 
-  }
\ No newline at end of file
+  /**
+   * Get the public address of the contract on Ethereum network.
+   * @returns public address of the contract.
+   */
+  public getContractAddress(): string {
+    return this.contractAddress;
+  }
+}
diff --git a/step22_web3_smartcontract_read_data/abi/dai.json b/step22_web3_smartcontract_read_data/abi/dai.json
new file mode 100644
index 0000000..025f28e
--- /dev/null
+++ b/step22_web3_smartcontract_read_data/abi/dai.json
@@ -0,0 +1,333 @@
+[
+  {
+    "inputs": [
+      { "internalType": "uint256", "name": "chainId_", "type": "uint256" }
+    ],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "guy",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Approval",
+    "type": "event"
+  },
+  {
+    "anonymous": true,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "bytes4",
+        "name": "sig",
+        "type": "bytes4"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "usr",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg1",
+        "type": "bytes32"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg2",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes",
+        "name": "data",
+        "type": "bytes"
+      }
+    ],
+    "name": "LogNote",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "dst",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Transfer",
+    "type": "event"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "DOMAIN_SEPARATOR",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "PERMIT_TYPEHASH",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      { "internalType": "address", "name": "", "type": "address" },
+      { "internalType": "address", "name": "", "type": "address" }
+    ],
+    "name": "allowance",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "approve",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "balanceOf",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "burn",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "decimals",
+    "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "deny",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "mint",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "move",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "name",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "nonces",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "holder", "type": "address" },
+      { "internalType": "address", "name": "spender", "type": "address" },
+      { "internalType": "uint256", "name": "nonce", "type": "uint256" },
+      { "internalType": "uint256", "name": "expiry", "type": "uint256" },
+      { "internalType": "bool", "name": "allowed", "type": "bool" },
+      { "internalType": "uint8", "name": "v", "type": "uint8" },
+      { "internalType": "bytes32", "name": "r", "type": "bytes32" },
+      { "internalType": "bytes32", "name": "s", "type": "bytes32" }
+    ],
+    "name": "permit",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "pull",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "push",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "rely",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "symbol",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "totalSupply",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transfer",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transferFrom",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "version",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "wards",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  }
+]
diff --git a/step22_web3_smartcontract_read_data/index.ts b/step22_web3_smartcontract_read_data/index.ts
index 3fe52fb..0f65453 100644
--- a/step22_web3_smartcontract_read_data/index.ts
+++ b/step22_web3_smartcontract_read_data/index.ts
@@ -1,15 +1,30 @@
-import { SmartContract } from './SmartContract';
+import { ERC20Token } from "./ERC20Token";
+import DAI_ABI from "./abi/dai.json";
 
-const contract : SmartContract = new SmartContract();
+const DAI_CONTRACT_ADDRESS = "0x6B175474E89094C44Da98b954EedeAC495271d0F";
+// This is the address of a random account on Ethereum that holds
+// some DAI. You may grab any other account from EtherScan.
+const DAI_HOLDER = "0x6b175474e89094c44da98b954eedeac495271d0f";
 
-contract.getContractName().then(response => console.log(response));
+const numberFormator = new Intl.NumberFormat("us-EN", {
+  style: "currency",
+  currency: "DAI",
+});
 
-contract.getContractSymbol().then(response => console.log(response));
+(async () => {
+  // Instantiate DAI Token instance from ERC20Token class.
+  const daiToken = new ERC20Token(
+    DAI_CONTRACT_ADDRESS,
+    JSON.stringify(DAI_ABI)
+  );
 
-contract.getTotalSupply().then(response => console.log(response));
-
-
-contract.getAccountBalance("0x6b175474e89094c44da98b954eedeac495271d0f").then(response => console.log(response));
+  console.log("Token Name:", await daiToken.getTokenName());
 
+  console.log("Token Symbol:", await daiToken.getTokenSymbol());
 
+  const totalSupply = await daiToken.getTotalSupply();
+  console.log("Total Supply:", numberFormator.format(totalSupply));
 
+  const balance = await daiToken.getAccountBalance(DAI_HOLDER);
+  console.log("Balance of Given Account:", numberFormator.format(balance));
+})();
diff --git a/step22_web3_smartcontract_read_data/package-lock.json b/step22_web3_smartcontract_read_data/package-lock.json
index 90f79cf..3d46fca 100644
--- a/step22_web3_smartcontract_read_data/package-lock.json
+++ b/step22_web3_smartcontract_read_data/package-lock.json
@@ -1,5423 +1,8 @@
 {
   "name": "step21_web3_node_getbalance",
   "version": "1.0.0",
-  "lockfileVersion": 2,
+  "lockfileVersion": 1,
   "requires": true,
-  "packages": {
-    "": {
-      "version": "1.0.0",
-      "license": "ISC",
-      "dependencies": {
-        "web3": "^1.5.2"
-      },
-      "devDependencies": {
-        "@types/node": "^12.20.19",
-        "nodemon": "^2.0.12",
-        "ts-node-dev": "^1.1.8",
-        "tslint": "^6.1.3"
-      }
-    },
-    "node_modules/@babel/code-frame": {
-      "version": "7.14.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
-      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
-      "dev": true,
-      "dependencies": {
-        "@babel/highlight": "^7.14.5"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
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-      "engines": {
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-      }
-    }
-  },
   "dependencies": {
     "@babel/code-frame": {
       "version": "7.14.5",
@@ -8572,21 +3157,6 @@
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@@ -8616,6 +3186,21 @@
         "define-properties": "^1.1.3"
       }
     },
+    "string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
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+        }
+      }
+    },
     "strip-ansi": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
@@ -8933,13 +3518,6 @@
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diff --git a/step22_web3_smartcontract_read_data/readme.md b/step22_web3_smartcontract_read_data/readme.md
index 9b4fbf6..c8e220a 100644
--- a/step22_web3_smartcontract_read_data/readme.md
+++ b/step22_web3_smartcontract_read_data/readme.md
@@ -1,27 +1,42 @@
-# Read Data From Smart Contract
+# Step 22: Read Data From a Deployed Smart Contract
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=tu92jcqdn6s&t=2s)
+## References:
 
-[Read the #2 of this Tutorial](https://www.dappuniversity.com/articles/web3-js-intro)
+1.  Watch [Video Tutorial](https://www.youtube.com/watch?v=tu92jcqdn6s&t=2s)
+2.  Read the #2 of this [Tutorial](https://www.dappuniversity.com/articles/web3-js-intro)
 
+## Step 1
 
-We are going to use Dai ABI from here:
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code
+## Step 2
 
-Also get the address of someone who holds Dai from the Holders tab
+Go to EtherScan, and grab [ABI of DAI Token](https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code). ABI is the JSON representation of a smart contract. Also, copy the address of the DAI's smart contract from there. Now, create `./abi/dai.json` for saving DAI's ABI.
 
-Create SmartContract.ts, and index.ts
+## Step 3
 
+Create `SmartContract.ts`, `ERC20Token.ts` and `index.ts` files. ERC20 is a set of standards that defines how an ERC20 Token should behave. Any smart contract that implements ERC20 standards can be classified as an ERC20 Token. It is a perfect case of inheritance. That's why we have implemented a SmartContract class and an ERC20Token class that inherits from the former. DAI is also an ERC20Token.
 
-npm start
+In `SmartContract.ts`, replace INFURA_PROJECT_ID with your Infura project ID.
 
-or
+```ts
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/INFURA_PROJECT_ID";
+```
 
-tsc
+In `index.ts`, we use the ABI and address of DAI to instantiate an ERC20Token object, and then, play with it.
 
-node index
+## Step 4
 
+Run the project with the following commands:
 
+```bash
+npm link typescript
+npm start
+```
 
+or with these commands.
 
+```bash
+tsc
+node index
+```
diff --git a/step22_web3_smartcontract_read_data/tsconfig.json b/step22_web3_smartcontract_read_data/tsconfig.json
index 07d2004..a24a581 100644
--- a/step22_web3_smartcontract_read_data/tsconfig.json
+++ b/step22_web3_smartcontract_read_data/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step22_web3_smartcontract_read_data/tslint.json b/step22_web3_smartcontract_read_data/tslint.json
index 24388b8..a64df52 100644
--- a/step22_web3_smartcontract_read_data/tslint.json
+++ b/step22_web3_smartcontract_read_data/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step23_web3_smartcontract_read_data_typechain/.gitignore b/step23_web3_smartcontract_read_data_typechain/.gitignore
index 6b99dca..d77410f 100644
--- a/step23_web3_smartcontract_read_data_typechain/.gitignore
+++ b/step23_web3_smartcontract_read_data_typechain/.gitignore
@@ -1,3 +1,8 @@
+# Node packages
 node_modules
+
+# Build files created by TypeScript Compiler
+*.js
+
+# TypeScript bindings generated by TypeChain
 types
-*.js
\ No newline at end of file
diff --git a/step23_web3_smartcontract_read_data_typechain/DaiToken.ts b/step23_web3_smartcontract_read_data_typechain/DaiToken.ts
new file mode 100644
index 0000000..b221443
--- /dev/null
+++ b/step23_web3_smartcontract_read_data_typechain/DaiToken.ts
@@ -0,0 +1,78 @@
+import Web3 from "web3";
+import { Dai } from "./types/web3-v1-contracts/dai";
+import daiAbi from "./abi/dai.json";
+
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/INFURA_PROJECT_ID";
+
+export class DaiToken {
+  private static readonly DAI_ADDRESS =
+    "0x6B175474E89094C44Da98b954EedeAC495271d0F";
+  private static readonly DAI_ABI = JSON.stringify(daiAbi);
+
+  private web3: Web3;
+  private dai: Dai;
+
+  /**
+   * Object representing the Dai Token Contract on Ethereum.
+   */
+  public constructor() {
+    this.web3 = new Web3(RPC_ENDPOINT);
+    this.dai = new this.web3.eth.Contract(
+      JSON.parse(DaiToken.DAI_ABI),
+      DaiToken.DAI_ADDRESS
+    ) as any as Dai;
+  }
+
+  /**
+   * Get the public address of the contract on Ethereum network.
+   * @returns public address of the contract.
+   */
+  public getContractAddress(): string {
+    return DaiToken.DAI_ADDRESS;
+  }
+
+  /**
+   * Get full name of DAI token mentioned in its smart contract.
+   * @returns full name of DAI token.
+   */
+  public async getTokenName() {
+    return await this.dai.methods.name().call();
+  }
+
+  /**
+   * Get the symbol of DAI token mentioned in its smart contract.
+   * @returns symbol of DAI token.
+   */
+  public async getTokenSymbol() {
+    return await this.dai.methods.symbol().call();
+  }
+
+  /**
+   * Get the number of decimal places when representing DAIs.
+   * @returns number of decimal places.
+   */
+  public async getNumDecimals() {
+    return await this.dai.methods.decimals().call();
+  }
+
+  /**
+   * Get total number of DAIs minted.
+   * @returns total supply of DAIs in the market.
+   */
+  public async getTotalSupply() {
+    const totalSupply = await this.dai.methods.totalSupply().call();
+    const numDecimals = await this.getNumDecimals();
+    return +totalSupply / 10 ** +numDecimals;
+  }
+
+  /**
+   * Get the number of DAIs held by an account.
+   * @param accountAddress public address of the account.
+   * @returns number of DAIs held by the provided account.
+   */
+  public async getAccountBalance(accountAddress: string) {
+    const balance = await this.dai.methods.balanceOf(accountAddress).call();
+    const numDecimals = await this.getNumDecimals();
+    return +balance / 10 ** +numDecimals;
+  }
+}
diff --git a/step23_web3_smartcontract_read_data_typechain/SmartContract.ts b/step23_web3_smartcontract_read_data_typechain/SmartContract.ts
deleted file mode 100644
index ccdb965..0000000
--- a/step23_web3_smartcontract_read_data_typechain/SmartContract.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-import Web3 from 'web3';
-import EthContract from 'web3-eth-contract';
-
-import { Dai } from './types/web3-v1-contracts/dai'
-const dai_abi = require('./abi/dai.json')
-
-export class SmartContract {
-    private static readonly DAI_ADDRESS: string = '0x6B175474E89094C44Da98b954EedeAC495271d0F';
-    
-    private web3: Web3;
-    private contractAddress: string;
-    private dai: Dai;
-   
-    // Got an Default Smart Contract Address from Etherscan: https://etherscan.io/accounts
-    public constructor(contractAddress: string = SmartContract.DAI_ADDRESS) {
-        this.contractAddress = contractAddress;
-        this.web3 = new Web3("https://mainnet.infura.io/v3/your_url");
-        this.dai = (new this.web3.eth.Contract(dai_abi, this.contractAddress) as any) as Dai
-    }
-
-    public getContractAddress(): string {
-      return this.contractAddress;
-    }
-
-    public async getContractName() {
-      return await this.dai.methods.name().call();
-    }
-
-    public async getContractSymbol() {
-      return await this.dai.methods.symbol().call();
-    }
-
-    public async getTotalSupply() {
-      return await this.dai.methods.totalSupply().call();
-    }
-
-    
-    public async getAccountBalance(accountAddress: string) {
-      return await this.dai.methods.balanceOf(accountAddress).call()
-
-    }
-
-  }
\ No newline at end of file
diff --git a/step23_web3_smartcontract_read_data_typechain/abi/dai.json b/step23_web3_smartcontract_read_data_typechain/abi/dai.json
index 7dc4219..025f28e 100644
--- a/step23_web3_smartcontract_read_data_typechain/abi/dai.json
+++ b/step23_web3_smartcontract_read_data_typechain/abi/dai.json
@@ -1,277 +1,333 @@
 [
-
-    {
-      "inputs": [{ "internalType": "uint256", "name": "chainId_", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        { "indexed": true, "internalType": "address", "name": "src", "type": "address" },
-        { "indexed": true, "internalType": "address", "name": "guy", "type": "address" },
-        { "indexed": false, "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "Approval",
-      "type": "event"
-    },
-    {
-      "anonymous": true,
-      "inputs": [
-        { "indexed": true, "internalType": "bytes4", "name": "sig", "type": "bytes4" },
-        { "indexed": true, "internalType": "address", "name": "usr", "type": "address" },
-        { "indexed": true, "internalType": "bytes32", "name": "arg1", "type": "bytes32" },
-        { "indexed": true, "internalType": "bytes32", "name": "arg2", "type": "bytes32" },
-        { "indexed": false, "internalType": "bytes", "name": "data", "type": "bytes" }
-      ],
-      "name": "LogNote",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        { "indexed": true, "internalType": "address", "name": "src", "type": "address" },
-        { "indexed": true, "internalType": "address", "name": "dst", "type": "address" },
-        { "indexed": false, "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "Transfer",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "DOMAIN_SEPARATOR",
-      "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "PERMIT_TYPEHASH",
-      "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        { "internalType": "address", "name": "", "type": "address" },
-        { "internalType": "address", "name": "", "type": "address" }
-      ],
-      "name": "allowance",
-      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "usr", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "approve",
-      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
-      "name": "balanceOf",
-      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "usr", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "burn",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "decimals",
-      "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
-      "name": "deny",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "usr", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "mint",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "src", "type": "address" },
-        { "internalType": "address", "name": "dst", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "move",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "name",
-      "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
-      "name": "nonces",
-      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "holder", "type": "address" },
-        { "internalType": "address", "name": "spender", "type": "address" },
-        { "internalType": "uint256", "name": "nonce", "type": "uint256" },
-        { "internalType": "uint256", "name": "expiry", "type": "uint256" },
-        { "internalType": "bool", "name": "allowed", "type": "bool" },
-        { "internalType": "uint8", "name": "v", "type": "uint8" },
-        { "internalType": "bytes32", "name": "r", "type": "bytes32" },
-        { "internalType": "bytes32", "name": "s", "type": "bytes32" }
-      ],
-      "name": "permit",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "usr", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "pull",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "usr", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "push",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
-      "name": "rely",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "symbol",
-      "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "totalSupply",
-      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "dst", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "transfer",
-      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        { "internalType": "address", "name": "src", "type": "address" },
-        { "internalType": "address", "name": "dst", "type": "address" },
-        { "internalType": "uint256", "name": "wad", "type": "uint256" }
-      ],
-      "name": "transferFrom",
-      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "version",
-      "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
-      "name": "wards",
-      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    }
-  ]
\ No newline at end of file
+  {
+    "inputs": [
+      { "internalType": "uint256", "name": "chainId_", "type": "uint256" }
+    ],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "guy",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Approval",
+    "type": "event"
+  },
+  {
+    "anonymous": true,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "bytes4",
+        "name": "sig",
+        "type": "bytes4"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "usr",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg1",
+        "type": "bytes32"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg2",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes",
+        "name": "data",
+        "type": "bytes"
+      }
+    ],
+    "name": "LogNote",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "dst",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Transfer",
+    "type": "event"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "DOMAIN_SEPARATOR",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "PERMIT_TYPEHASH",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      { "internalType": "address", "name": "", "type": "address" },
+      { "internalType": "address", "name": "", "type": "address" }
+    ],
+    "name": "allowance",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "approve",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "balanceOf",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "burn",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "decimals",
+    "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "deny",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "mint",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "move",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "name",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "nonces",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "holder", "type": "address" },
+      { "internalType": "address", "name": "spender", "type": "address" },
+      { "internalType": "uint256", "name": "nonce", "type": "uint256" },
+      { "internalType": "uint256", "name": "expiry", "type": "uint256" },
+      { "internalType": "bool", "name": "allowed", "type": "bool" },
+      { "internalType": "uint8", "name": "v", "type": "uint8" },
+      { "internalType": "bytes32", "name": "r", "type": "bytes32" },
+      { "internalType": "bytes32", "name": "s", "type": "bytes32" }
+    ],
+    "name": "permit",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "pull",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "push",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "rely",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "symbol",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "totalSupply",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transfer",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transferFrom",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "version",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "wards",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  }
+]
diff --git a/step23_web3_smartcontract_read_data_typechain/index.ts b/step23_web3_smartcontract_read_data_typechain/index.ts
index 3fe52fb..4b60d16 100644
--- a/step23_web3_smartcontract_read_data_typechain/index.ts
+++ b/step23_web3_smartcontract_read_data_typechain/index.ts
@@ -1,15 +1,25 @@
-import { SmartContract } from './SmartContract';
+import { DaiToken } from "./DaiToken";
 
-const contract : SmartContract = new SmartContract();
+// This is the address of a random account on Ethereum that holds
+// some DAI. You may grab any other account from EtherScan.
+const DAI_HOLDER = "0x6b175474e89094c44da98b954eedeac495271d0f";
 
-contract.getContractName().then(response => console.log(response));
+const numberFormator = new Intl.NumberFormat("us-EN", {
+  style: "currency",
+  currency: "DAI",
+});
 
-contract.getContractSymbol().then(response => console.log(response));
+(async () => {
+  // Instantiate DAI Token instance from ERC20Token class.
+  const daiToken = new DaiToken();
 
-contract.getTotalSupply().then(response => console.log(response));
-
-
-contract.getAccountBalance("0x6b175474e89094c44da98b954eedeac495271d0f").then(response => console.log(response));
+  console.log("Token Name:", await daiToken.getTokenName());
 
+  console.log("Token Symbol:", await daiToken.getTokenSymbol());
 
+  const totalSupply = await daiToken.getTotalSupply();
+  console.log("Total Supply:", numberFormator.format(totalSupply));
 
+  const balance = await daiToken.getAccountBalance(DAI_HOLDER);
+  console.log("Balance of Given Account:", numberFormator.format(balance));
+})();
diff --git a/step23_web3_smartcontract_read_data_typechain/package-lock.json b/step23_web3_smartcontract_read_data_typechain/package-lock.json
index 15bb790..e305325 100644
--- a/step23_web3_smartcontract_read_data_typechain/package-lock.json
+++ b/step23_web3_smartcontract_read_data_typechain/package-lock.json
@@ -7,6 +7,7 @@
     "": {
       "name": "step21_web3_node_getbalance",
       "version": "1.0.0",
+      "hasInstallScript": true,
       "license": "ISC",
       "dependencies": {
         "web3": "^1.5.2"
diff --git a/step23_web3_smartcontract_read_data_typechain/package.json b/step23_web3_smartcontract_read_data_typechain/package.json
index a7dfc87..254dc5c 100644
--- a/step23_web3_smartcontract_read_data_typechain/package.json
+++ b/step23_web3_smartcontract_read_data_typechain/package.json
@@ -4,10 +4,10 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "generate-types": "typechain --target=web3-v1 \"/abi/*.json\"" ,
+    "generate-types": "typechain --target=web3-v1 \"abi/*.json\"",
     "postinstall": "yarn generate-types",
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "Zia Khan",
   "license": "ISC",
diff --git a/step23_web3_smartcontract_read_data_typechain/readme.md b/step23_web3_smartcontract_read_data_typechain/readme.md
index 3e9d031..fb6e38b 100644
--- a/step23_web3_smartcontract_read_data_typechain/readme.md
+++ b/step23_web3_smartcontract_read_data_typechain/readme.md
@@ -1,49 +1,70 @@
-# Read Data From Smart Contract using TypeChain
+# Step 23: Read Data From Smart Contract Using TypeChain
 
-TypeChain is a TypeScript binding for Ethereum smart contracts
+## References
 
-[Introducing TypeChain — Typescript bindings for Ethereum smart contracts](https://blog.neufund.org/introducing-typechain-typescript-bindings-for-ethereum-smart-contracts-839fc2becf22)
+1.  [Introducing TypeChain — Typescript bindings for Ethereum smart contracts](https://blog.neufund.org/introducing-typechain-typescript-bindings-for-ethereum-smart-contracts-839fc2becf22)
 
+2.  [TypeChain Repo](https://github.com/ethereum-ts/TypeChain)
 
-[We will follow this TypeChain Web3 Example](https://github.com/ethereum-ts/TypeChain/tree/master/examples/web3-v1)
+3.  [We will follow this TypeChain Web3 Example](https://github.com/ethereum-ts/TypeChain/tree/master/examples/web3-v1)
 
-npm install --save-dev typechain @typechain/web3-v1 @types/bn.js
+## Step 1
 
-Add scripts generate-types and postinstall in package.json
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-We are going to use Dai ABI from here and create a file abi/dai.json:
+[TypeChain](https://github.com/ethereum-ts/TypeChain) is a library that generates TypeScript bindings for Ethereum smart contracts. It will provide us with intellisense and type-checking for the methods we call on smart contract objects. Install TypeChain and other peer dependencies.
 
-https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code
+```
+npm install --save-dev typechain @typechain/web3-v1 @types/bn.js
+```
 
-npm run generate-types
+Add scripts `generate-types` and `postinstall` in package.json
 
-Notice that two files generated in types/web3-v1-contracts directory
+```json
+"scripts": {
+  "generate-types": "typechain --target=web3-v1 \"abi/*.json\"",
+  "postinstall": "yarn generate-types",
+  "test": "echo \"Error: no test specified\" && exit 1",
+  "start": "ts-node-dev --respawn index.ts"
+}
+```
 
-Note:
+## Step 2
 
-This generates typechain outputs on macos and linux but NOT on windows
+Go to EtherScan, and grab [ABI of DAI Token](https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code). ABI is the JSON representation of a smart contract. Also, copy the address of the DAI's smart contract from there. Now, create `./abi/dai.json` for saving DAI's ABI.
 
+## Step 3
+
+Run the following command. Notice that it generates two files in `types/web3-v1-contracts` directory.
+
+```
+npm run generate-types
+```
 
-[Windows Work Around](https://github.com/ethereum-ts/TypeChain/issues/271)
+## Step 4
 
-use  "generate-types": "typechain --target=web3-v1 \"./src/abi/*.json\"" ,
-in pakage.json
+Create `DaiToken.ts` and `index.ts` files. In `DaiToken.ts`, we have implemented DaiToken class that exposes some of the basic functions implemented in DAI's smart contract. This time coding this class was a lot easier thanks to the types generated by TypeChain.
 
+In `DaiToken.ts`, replace INFURA_PROJECT_ID with your Infura project ID.
 
+```ts
+const RPC_ENDPOINT = "https://mainnet.infura.io/v3/INFURA_PROJECT_ID";
+```
 
-Also get the address of someone who holds Dai from the Holders tab
+In `index.ts`, we instantiate a `DaiToken` object, and then, play with it.
 
-Create SmartContract.ts, and index.ts
+## Step 5
 
+Run the project with the following commands:
 
+```bash
+npm link typescript
 npm start
+```
 
-or
+or with these commands.
 
+```bash
 tsc
-
 node index
-
-
-
-
+```
diff --git a/step23_web3_smartcontract_read_data_typechain/tsconfig.json b/step23_web3_smartcontract_read_data_typechain/tsconfig.json
index f472cb4..a24a581 100644
--- a/step23_web3_smartcontract_read_data_typechain/tsconfig.json
+++ b/step23_web3_smartcontract_read_data_typechain/tsconfig.json
@@ -1,18 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
-    
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step23_web3_smartcontract_read_data_typechain/tslint.json b/step23_web3_smartcontract_read_data_typechain/tslint.json
index 24388b8..a64df52 100644
--- a/step23_web3_smartcontract_read_data_typechain/tslint.json
+++ b/step23_web3_smartcontract_read_data_typechain/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step24_web3_send_transaction_unlocked_account/.gitignore b/step24_web3_send_transaction_unlocked_account/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step24_web3_send_transaction_unlocked_account/.gitignore
+++ b/step24_web3_send_transaction_unlocked_account/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step24_web3_send_transaction_unlocked_account/EthreumAccount.ts b/step24_web3_send_transaction_unlocked_account/EthreumAccount.ts
new file mode 100755
index 0000000..e66085e
--- /dev/null
+++ b/step24_web3_send_transaction_unlocked_account/EthreumAccount.ts
@@ -0,0 +1,50 @@
+import Web3 from "web3";
+
+// URL of Ganache localhost.
+const RPC_ENDPOINT = "http://127.0.0.1:7545";
+
+export class EthereumAccount {
+  private web3: Web3;
+  private address: string;
+
+  /**
+   * Instantiate an Ethereum Account object.
+   * @param address public address of an Ethereum account.
+   */
+  constructor(address: string) {
+    this.address = address;
+    this.web3 = new Web3(RPC_ENDPOINT);
+  }
+
+  /**
+   * Get the public address of the Ethereum account.
+   * @returns public address of the account.
+   */
+  getAddress = () => this.address;
+
+  /**
+   * Get the Ethers balance of the account.
+   * @returns Ethers in the account.
+   */
+  getBalance = async () => {
+    return await this.web3.eth
+      .getBalance(this.address)
+      .then(wei => this.web3.utils.fromWei(wei, "ether"));
+  };
+
+  /**
+   * Send Ethers from this account to another one.
+   * @param ethersAmount amount of Ethers to send.
+   * @param receiverAddress public address of receiver's account.
+   * @returns transaction object for sending Ethers.
+   */
+  sendEthers = async (ethersAmount: number, receiverAddress: string) => {
+    return await this.web3.eth.sendTransaction({
+      from: this.address,
+      to: receiverAddress,
+      value: this.web3.utils.toWei(ethersAmount.toString(), "ether"),
+      gas: 21000,
+      gasPrice: this.web3.utils.toWei(this.web3.utils.toBN(10), "gwei"),
+    });
+  };
+}
diff --git a/step24_web3_send_transaction_unlocked_account/images/Screenshot of Ganache.png b/step24_web3_send_transaction_unlocked_account/images/Screenshot of Ganache.png
new file mode 100644
index 0000000..f3844d4
Binary files /dev/null and b/step24_web3_send_transaction_unlocked_account/images/Screenshot of Ganache.png differ
diff --git a/step24_web3_send_transaction_unlocked_account/index.ts b/step24_web3_send_transaction_unlocked_account/index.ts
index 41285e7..9eafb28 100644
--- a/step24_web3_send_transaction_unlocked_account/index.ts
+++ b/step24_web3_send_transaction_unlocked_account/index.ts
@@ -1,11 +1,25 @@
-import { Transaction } from './transaction';
+import { EthereumAccount } from "./EthreumAccount";
 
-const transaction : Transaction = new Transaction();
+// Get any two addresses from Ganache.
+const account1Address = "ACCOUNT_1_ADDRESS";
+const account2Address = "ACCOUNT_2_ADDRESS";
 
+// Wrap in a function so we can use async/await.
+(async () => {
+  // Instantiate two Ethereum account objects with the above addresses.
+  const account1 = new EthereumAccount(account1Address);
+  const account2 = new EthereumAccount(account2Address);
 
-transaction.getAccountBalance('AddPublicAddress').then(response => console.log(response));
-
-// send 1 ether from account 1 to account 2
-transaction.sendTransaction('Account1','Account2',1).then(response => console.log(response))
+  // Balance of the two accounts before the transaction
+  console.log("Before Transaction:");
+  console.log("Account 1 Balance ==>", await account1.getBalance(), "ETH");
+  console.log("Account 2 Balance ==>", await account2.getBalance(), "ETH");
 
+  console.log("Sending 5 Ethers from Accout 1 to Account 2...");
+  await account1.sendEthers(5, account2.getAddress());
 
+  // Status of the two accounts after the transaction
+  console.log("After Transaction:");
+  console.log("Account 1 Balance ==>", await account1.getBalance(), "ETH");
+  console.log("Account 2 Balance ==>", await account2.getBalance(), "ETH");
+})();
diff --git a/step24_web3_send_transaction_unlocked_account/package-lock.json b/step24_web3_send_transaction_unlocked_account/package-lock.json
index 90f79cf..8cfc435 100644
--- a/step24_web3_send_transaction_unlocked_account/package-lock.json
+++ b/step24_web3_send_transaction_unlocked_account/package-lock.json
@@ -1,10 +1,11 @@
 {
-  "name": "step21_web3_node_getbalance",
+  "name": "step24",
   "version": "1.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
+      "name": "step24",
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
@@ -61,6 +62,35 @@
         "ethereumjs-util": "^7.1.0"
       }
     },
+    "node_modules/@ethereumjs/common/node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@ethereumjs/common/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+      "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "ethjs-util": "0.1.6",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@ethereumjs/tx": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.3.0.tgz",
@@ -70,6 +100,35 @@
         "ethereumjs-util": "^7.1.0"
       }
     },
+    "node_modules/@ethereumjs/tx/node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@ethereumjs/tx/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@ethereumjs/tx/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+      "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "ethjs-util": "0.1.6",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@ethersproject/abi": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.0.7.tgz",
@@ -273,9 +332,9 @@
       }
     },
     "node_modules/@ethersproject/logger": {
-      "version": "5.4.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.4.0.tgz",
-      "integrity": "sha512-xYdWGGQ9P2cxBayt64d8LC8aPFJk6yWCawQi/4eJ4+oJdMMjEBMrIcIMZ9AxhwpPVmnBPrsB10PcXGmGAqgUEQ==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.4.1.tgz",
+      "integrity": "sha512-DZ+bRinnYLPw1yAC64oRl0QyVZj43QeHIhVKfD/+YwSz4wsv1pfwb5SOFjz+r710YEWzU6LrhuSjpSO+6PeE4A==",
       "funding": [
         {
           "type": "individual",
@@ -306,9 +365,9 @@
       }
     },
     "node_modules/@ethersproject/properties": {
-      "version": "5.4.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/properties/-/properties-5.4.0.tgz",
-      "integrity": "sha512-7jczalGVRAJ+XSRvNA6D5sAwT4gavLq3OXPuV/74o3Rd2wuzSL035IMpIMgei4CYyBdialJMrTqkOnzccLHn4A==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/properties/-/properties-5.4.1.tgz",
+      "integrity": "sha512-cyCGlF8wWlIZyizsj2PpbJ9I7rIlUAfnHYwy/T90pdkSn/NFTa5YWZx2wTJBe9V7dD65dcrrEMisCRUJiq6n3w==",
       "funding": [
         {
           "type": "individual",
@@ -461,9 +520,9 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "12.20.19",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.20.19.tgz",
-      "integrity": "sha512-niAuZrwrjKck4+XhoCw6AAVQBENHftpXw9F4ryk66fTgYaKQ53R4FI7c9vUGGw5vQis1HKBHDR1gcYI/Bq1xvw=="
+      "version": "12.20.21",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.20.21.tgz",
+      "integrity": "sha512-Qk7rOvV2A4vNgXNS88vEvbJE1NDFPCQ8AU+pNElrU2bA4yrRDef3fg3SUe+xkwyin3Bpg/Xh5JkNWTlsOcS2tA=="
     },
     "node_modules/@types/pbkdf2": {
       "version": "3.1.0",
@@ -793,6 +852,19 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/body-parser/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/body-parser/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
     "node_modules/boxen": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/boxen/-/boxen-4.2.0.tgz",
@@ -978,25 +1050,6 @@
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
       "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
     },
-    "node_modules/browserify-sign/node_modules/safe-buffer": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ]
-    },
     "node_modules/bs58": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/bs58/-/bs58-4.0.1.tgz",
@@ -1316,6 +1369,11 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/content-disposition/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+    },
     "node_modules/content-hash": {
       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/content-hash/-/content-hash-2.5.2.tgz",
@@ -1475,11 +1533,12 @@
       }
     },
     "node_modules/debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
+      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+      "dev": true,
       "dependencies": {
-        "ms": "2.0.0"
+        "ms": "^2.1.1"
       }
     },
     "node_modules/decode-uri-component": {
@@ -1832,35 +1891,6 @@
         "setimmediate": "^1.0.5"
       }
     },
-    "node_modules/ethereumjs-util": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
-      "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
-      "dependencies": {
-        "@types/bn.js": "^5.1.0",
-        "bn.js": "^5.1.2",
-        "create-hash": "^1.1.2",
-        "ethereum-cryptography": "^0.1.3",
-        "ethjs-util": "0.1.6",
-        "rlp": "^2.2.4"
-      },
-      "engines": {
-        "node": ">=10.0.0"
-      }
-    },
-    "node_modules/ethereumjs-util/node_modules/@types/bn.js": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
-      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
-      "dependencies": {
-        "@types/node": "*"
-      }
-    },
-    "node_modules/ethereumjs-util/node_modules/bn.js": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
-      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
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diff --git a/step24_web3_send_transaction_unlocked_account/package.json b/step24_web3_send_transaction_unlocked_account/package.json
index 96c7751..0e2a21c 100644
--- a/step24_web3_send_transaction_unlocked_account/package.json
+++ b/step24_web3_send_transaction_unlocked_account/package.json
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+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "Waris Hasan",
   "license": "ISC",
   "dependencies": {
-    "ethereumjs-tx": "^2.1.2",
     "web3": "^1.5.2"
   },
   "devDependencies": {
diff --git a/step24_web3_send_transaction_unlocked_account/readme.md b/step24_web3_send_transaction_unlocked_account/readme.md
index 5d59e0e..8f2a21b 100644
--- a/step24_web3_send_transaction_unlocked_account/readme.md
+++ b/step24_web3_send_transaction_unlocked_account/readme.md
@@ -1,30 +1,46 @@
-# Send Transaction From Unlocked Account
+# Step 24: Send Transaction From Unlocked Account
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=uFdjZ-B3GCM&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=3)
+## References:
 
+1.  We will follow the first 10 minutes of this [video tutorial](https://www.youtube.com/watch?v=uFdjZ-B3GCM&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=3) in this step.
 
-This step covers the initial part of the video.
+## Step 1
 
-We are creating a transaction using web3js to send ethers from account1 to account2.
-In this example we are creating transactions using ganache, therefore all the public addresses are unlocked and the node takes care of signing of the transaction.
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-You can download ganache from 
+## Step 2
 
-https://www.trufflesuite.com/ganache
+[Ganache](https://www.trufflesuite.com/ganache) is a tool which creates a local Ethereum blockchain and serves it through a localhost. This local blockchain has nothing to do with the Ethereum Mainnet. It generates 10 accounts, each having a balance of 100 ETH. Public addresses and private keys of all the accounts are also available; so, you can play around with the accounts without spending a penny. All of the accounts on Ganache are unlocked: so, you need not sign any transaction. [Download Ganache](https://www.trufflesuite.com/ganache).
 
+## Step 3
 
-Ganache creates many public addresses for you. You can use them
+Create `EthereumAccount.ts` and `index.ts` files. In `EthereumAccount.ts`, we are using Ganache localhost URL as RPC_ENDPOINT.
 
-npm link typescript
+```ts
+const RPC_ENDPOINT = "http://127.0.0.1:7545";
+```
 
-npm start
+From Ganache's UI copy any two public addresses, and in `index.ts`, use them to instantiate two `EthereumAccount` objects.
 
-or
+```ts
+const account1Address = "ACCOUNT_1_ADDRESS";
+const account2Address = "ACCOUNT_2_ADDRESS";
+```
 
-tsc
+## Step 4
 
-node index
+Run the project with the following command:
 
+```bash
+npm link typescript
+npm start
+```
 
+or with these commands.
 
+```bash
+tsc
+node index
+```
 
+After the transaction, the balances of the two accounts used will be updated in Ganache's UI too.
diff --git a/step24_web3_send_transaction_unlocked_account/transaction.ts b/step24_web3_send_transaction_unlocked_account/transaction.ts
deleted file mode 100644
index 6d8ae17..0000000
--- a/step24_web3_send_transaction_unlocked_account/transaction.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import Web3 from 'web3';
-import EthContract from 'web3-eth-contract';
-
-export class Transaction {
-    private web3: Web3
-   
-    public constructor() {
-
-      // use ganache rpc server endpoint here
-
-      // ganache is a block chain that runs on your local machine. You can download it from https://www.trufflesuite.com/ganache
-        this.web3 = new Web3("http://127.0.0.1:7545");
-    }
-
-
-    // get account balance
-    public async getAccountBalance(account:string) {
-      const balance =  await this.web3.eth.getBalance(account)
-      return this.web3.utils.fromWei(balance,'ether')
-    }
-
-    // send transaction for unlocked account (the node takes care of the signing) - only secure if you trust the node.
-    public async sendTransaction(sender:string, reciever:string,ethers:number) {
-      return await this.web3.eth.sendTransaction({from:sender,to:reciever,value:this.web3.utils.toWei(ethers.toString(),'ether')})
-    }
-
-   
-
-  }
\ No newline at end of file
diff --git a/step24_web3_send_transaction_unlocked_account/tsconfig.json b/step24_web3_send_transaction_unlocked_account/tsconfig.json
index 07d2004..a24a581 100644
--- a/step24_web3_send_transaction_unlocked_account/tsconfig.json
+++ b/step24_web3_send_transaction_unlocked_account/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step24_web3_send_transaction_unlocked_account/yarn.lock b/step24_web3_send_transaction_unlocked_account/yarn.lock
deleted file mode 100644
index 7b89b82..0000000
--- a/step24_web3_send_transaction_unlocked_account/yarn.lock
+++ /dev/null
@@ -1,3632 +0,0 @@
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-  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
-  integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
-
-mkdirp@^0.5.3, mkdirp@^0.5.5:
-  version "0.5.5"
-  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.5.tgz#d91cefd62d1436ca0f41620e251288d420099def"
-  integrity sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==
-  dependencies:
-    minimist "^1.2.5"
-
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-  version "4.14.0"
-  resolved "https://registry.yarnpkg.com/mock-fs/-/mock-fs-4.14.0.tgz#ce5124d2c601421255985e6e94da80a7357b1b18"
-  integrity sha512-qYvlv/exQ4+svI3UOvPUpLDF0OMX5euvUH0Ny4N5QyRyhNdgAgUrVH3iUINSzEPLvx0kbo/Bp28GJKIqvE7URw==
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
-  integrity sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=
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-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
-  integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
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-  version "2.1.3"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.3.tgz#574c8138ce1d2b5861f0b44579dbadd60c6615b2"
-  integrity sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==
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-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/multibase/-/multibase-0.7.0.tgz#1adfc1c50abe05eefeb5091ac0c2728d6b84581b"
-  integrity sha512-TW8q03O0f6PNFTQDvh3xxH03c8CjGaaYrjkl9UQPG6rz53TQzzxJVCIWVjzcbN/Q5Y53Zd0IBQBMVktVgNx4Fg==
-  dependencies:
-    base-x "^3.0.8"
-    buffer "^5.5.0"
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-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/multibase/-/multibase-0.6.1.tgz#b76df6298536cc17b9f6a6db53ec88f85f8cc12b"
-  integrity sha512-pFfAwyTjbbQgNc3G7D48JkJxWtoJoBMaR4xQUOuB8RnCgRqaYmWNFeJTTvrJ2w51bjLq2zTby6Rqj9TQ9elSUw==
-  dependencies:
-    base-x "^3.0.8"
-    buffer "^5.5.0"
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-  version "0.5.7"
-  resolved "https://registry.yarnpkg.com/multicodec/-/multicodec-0.5.7.tgz#1fb3f9dd866a10a55d226e194abba2dcc1ee9ffd"
-  integrity sha512-PscoRxm3f+88fAtELwUnZxGDkduE2HD9Q6GHUOywQLjOGT/HAdhjLDYNZ1e7VR0s0TP0EwZ16LNUTFpoBGivOA==
-  dependencies:
-    varint "^5.0.0"
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/multicodec/-/multicodec-1.0.4.tgz#46ac064657c40380c28367c90304d8ed175a714f"
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-    buffer "^5.6.0"
-    varint "^5.0.0"
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-  version "0.4.21"
-  resolved "https://registry.yarnpkg.com/multihashes/-/multihashes-0.4.21.tgz#dc02d525579f334a7909ade8a122dabb58ccfcb5"
-  integrity sha512-uVSvmeCWf36pU2nB4/1kzYZjsXD9vofZKpgudqkceYY5g2aZZXJ5r9lxuzoRLl1OAp28XljXsEJ/X/85ZsKmKw==
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-    buffer "^5.5.0"
-    multibase "^0.7.0"
-    varint "^5.0.0"
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-nano-json-stream-parser@^0.1.2:
-  version "0.1.2"
-  resolved "https://registry.yarnpkg.com/nano-json-stream-parser/-/nano-json-stream-parser-0.1.2.tgz#0cc8f6d0e2b622b479c40d499c46d64b755c6f5f"
-  integrity sha1-DMj20OK2IrR5xA1JnEbWS3Vcb18=
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-negotiator@0.6.2:
-  version "0.6.2"
-  resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
-  integrity sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/next-tick/-/next-tick-1.0.0.tgz#ca86d1fe8828169b0120208e3dc8424b9db8342c"
-  integrity sha1-yobR/ogoFpsBICCOPchCS524NCw=
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-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/node-addon-api/-/node-addon-api-2.0.2.tgz#432cfa82962ce494b132e9d72a15b29f71ff5d32"
-  integrity sha512-Ntyt4AIXyaLIuMHF6IOoTakB3K+RWxwtsHNRxllEoA6vPwP9o4866g6YWDLUdnucilZhmkxiHwHr11gAENw+QA==
-
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-  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/node-gyp-build/-/node-gyp-build-4.2.3.tgz#ce6277f853835f718829efb47db20f3e4d9c4739"
-  integrity sha512-MN6ZpzmfNCRM+3t57PTJHgHyw/h4OWnZ6mR8P5j/uZtqQr46RRuDE/P+g3n0YR/AiYXeWixZZzaip77gdICfRg==
-
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-  version "2.0.12"
-  resolved "https://registry.yarnpkg.com/nodemon/-/nodemon-2.0.12.tgz#5dae4e162b617b91f1873b3bfea215dd71e144d5"
-  integrity sha512-egCTmNZdObdBxUBw6ZNwvZ/xzk24CKRs5K6d+5zbmrMr7rOpPmfPeF6OxM3DDpaRx331CQRFEktn+wrFFfBSOA==
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-    chokidar "^3.2.2"
-    debug "^3.2.6"
-    ignore-by-default "^1.0.1"
-    minimatch "^3.0.4"
-    pstree.remy "^1.1.7"
-    semver "^5.7.1"
-    supports-color "^5.5.0"
-    touch "^3.1.0"
-    undefsafe "^2.0.3"
-    update-notifier "^4.1.0"
-
-nopt@~1.0.10:
-  version "1.0.10"
-  resolved "https://registry.yarnpkg.com/nopt/-/nopt-1.0.10.tgz#6ddd21bd2a31417b92727dd585f8a6f37608ebee"
-  integrity sha1-bd0hvSoxQXuScn3Vhfim83YI6+4=
-  dependencies:
-    abbrev "1"
-
-normalize-path@^3.0.0, normalize-path@~3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
-  integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
-
-normalize-url@^4.1.0:
-  version "4.5.1"
-  resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-4.5.1.tgz#0dd90cf1288ee1d1313b87081c9a5932ee48518a"
-  integrity sha512-9UZCFRHQdNrfTpGg8+1INIg93B6zE0aXMVFkw1WFwvO4SlZywU6aLg5Of0Ap/PgcbSw4LNxvMWXMeugwMCX0AA==
-
-number-to-bn@1.7.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/number-to-bn/-/number-to-bn-1.7.0.tgz#bb3623592f7e5f9e0030b1977bd41a0c53fe1ea0"
-  integrity sha1-uzYjWS9+X54AMLGXe9QaDFP+HqA=
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-    bn.js "4.11.6"
-    strip-hex-prefix "1.0.0"
-
-oauth-sign@~0.9.0:
-  version "0.9.0"
-  resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.9.0.tgz#47a7b016baa68b5fa0ecf3dee08a85c679ac6455"
-  integrity sha512-fexhUFFPTGV8ybAtSIGbV6gOkSv8UtRbDBnAyLQw4QPKkgNlsH2ByPGtMUqdWkos6YCRmAqViwgZrJc/mRDzZQ==
-
-object-assign@^4, object-assign@^4.1.0, object-assign@^4.1.1:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
-  integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
-
-object-inspect@^1.11.0, object-inspect@^1.9.0:
-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.11.0.tgz#9dceb146cedd4148a0d9e51ab88d34cf509922b1"
-  integrity sha512-jp7ikS6Sd3GxQfZJPyH3cjcbJF6GZPClgdV+EFygjFLQ5FmW/dRUnTd9PQ9k0JhoNDabWFbpF1yCdSWCC6gexg==
-
-object-keys@^1.0.12, object-keys@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.1.1.tgz#1c47f272df277f3b1daf061677d9c82e2322c60e"
-  integrity sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==
-
-object.assign@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/object.assign/-/object.assign-4.1.2.tgz#0ed54a342eceb37b38ff76eb831a0e788cb63940"
-  integrity sha512-ixT2L5THXsApyiUPYKmW+2EHpXXe5Ii3M+f4e+aJFAHao5amFRW6J0OO6c/LU8Be47utCx2GL89hxGB6XSmKuQ==
-  dependencies:
-    call-bind "^1.0.0"
-    define-properties "^1.1.3"
-    has-symbols "^1.0.1"
-    object-keys "^1.1.1"
-
-oboe@2.1.5:
-  version "2.1.5"
-  resolved "https://registry.yarnpkg.com/oboe/-/oboe-2.1.5.tgz#5554284c543a2266d7a38f17e073821fbde393cd"
-  integrity sha1-VVQoTFQ6ImbXo48X4HOCH73jk80=
-  dependencies:
-    http-https "^1.0.0"
-
-on-finished@~2.3.0:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/on-finished/-/on-finished-2.3.0.tgz#20f1336481b083cd75337992a16971aa2d906947"
-  integrity sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=
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-    ee-first "1.1.1"
-
-once@^1.3.0, once@^1.3.1, once@^1.4.0:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
-  integrity sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
-  dependencies:
-    wrappy "1"
-
-p-cancelable@^0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/p-cancelable/-/p-cancelable-0.3.0.tgz#b9e123800bcebb7ac13a479be195b507b98d30fa"
-  integrity sha512-RVbZPLso8+jFeq1MfNvgXtCRED2raz/dKpacfTNxsx6pLEpEomM7gah6VeHSYV3+vo0OAi4MkArtQcWWXuQoyw==
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/p-cancelable/-/p-cancelable-1.1.0.tgz#d078d15a3af409220c886f1d9a0ca2e441ab26cc"
-  integrity sha512-s73XxOZ4zpt1edZYZzvhqFa6uvQc1vwUa0K0BdtIZgQMAJj9IbebH+JkgKZc9h+B05PKHLOTl4ajG1BmNrVZlw==
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
-  integrity sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4=
-
-p-timeout@^1.1.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/p-timeout/-/p-timeout-1.2.1.tgz#5eb3b353b7fce99f101a1038880bb054ebbea386"
-  integrity sha1-XrOzU7f86Z8QGhA4iAuwVOu+o4Y=
-  dependencies:
-    p-finally "^1.0.0"
-
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-  version "6.5.0"
-  resolved "https://registry.yarnpkg.com/package-json/-/package-json-6.5.0.tgz#6feedaca35e75725876d0b0e64974697fed145b0"
-  integrity sha512-k3bdm2n25tkyxcjSKzB5x8kfVxlMdgsbPr0GkZcwHsLpba6cBjqCt1KlcChKEvxHIcTB1FVMuwoijZ26xex5MQ==
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-    registry-auth-token "^4.0.0"
-    registry-url "^5.0.0"
-    semver "^6.2.0"
-
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-  version "5.1.6"
-  resolved "https://registry.yarnpkg.com/parse-asn1/-/parse-asn1-5.1.6.tgz#385080a3ec13cb62a62d39409cb3e88844cdaed4"
-  integrity sha512-RnZRo1EPU6JBnra2vGHj0yhp6ebyjBZpmUCLHWiFhxlzvBCCpAuZ7elsBp1PVAbQN0/04VD/19rfzlBSwLstMw==
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-    browserify-aes "^1.0.0"
-    evp_bytestokey "^1.0.0"
-    pbkdf2 "^3.0.3"
-    safe-buffer "^5.1.1"
-
-parse-headers@^2.0.0:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/parse-headers/-/parse-headers-2.0.4.tgz#9eaf2d02bed2d1eff494331ce3df36d7924760bf"
-  integrity sha512-psZ9iZoCNFLrgRjZ1d8mn0h9WRqJwFxM9q3x7iUjN/YT2OksthDJ5TiPCu2F38kS4zutqfW+YdVVkBZZx3/1aw==
-
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-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.3.tgz#9da19e7bee8d12dff0513ed5b76957793bc2e8d4"
-  integrity sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==
-
-path-is-absolute@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
-  integrity sha1-F0uSaHNVNP+8es5r9TpanhtcX18=
-
-path-parse@^1.0.6:
-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.7.tgz#fbc114b60ca42b30d9daf5858e4bd68bbedb6735"
-  integrity sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==
-
-path-to-regexp@0.1.7:
-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
-  integrity sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=
-
-pbkdf2@^3.0.17, pbkdf2@^3.0.3:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.1.2.tgz#dd822aa0887580e52f1a039dc3eda108efae3075"
-  integrity sha512-iuh7L6jA7JEGu2WxDwtQP1ddOpaJNC4KlDEFfdQajSGgGPNi4OyDc2R7QnbY2bR9QjBVGwgvTdNJZoE7RaxUMA==
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-    safe-buffer "^5.0.1"
-    sha.js "^2.4.8"
-
-performance-now@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
-  integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
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-picomatch@^2.0.4, picomatch@^2.2.1:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.0.tgz#f1f061de8f6a4bf022892e2d128234fb98302972"
-  integrity sha512-lY1Q/PiJGC2zOv/z391WOTD+Z02bCgsFfvxoXXf6h7kv9o+WmsmzYqrAwY63sNgOxE4xEdq0WyUnXfKeBrSvYw==
-
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
-  integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
-
-prepend-http@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
-  integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/printj/-/printj-1.1.2.tgz#d90deb2975a8b9f600fb3a1c94e3f4c53c78a222"
-  integrity sha512-zA2SmoLaxZyArQTOPj5LXecR+RagfPSU5Kw1qP+jkWeNlrq+eJZyY2oS68SU1Z/7/myXM4lo9716laOFAVStCQ==
-
-process@^0.11.10:
-  version "0.11.10"
-  resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
-  integrity sha1-czIwDoQBYb2j5podHZGn1LwW8YI=
-
-proxy-addr@~2.0.5:
-  version "2.0.7"
-  resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.7.tgz#f19fe69ceab311eeb94b42e70e8c2070f9ba1025"
-  integrity sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==
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-psl@^1.1.28:
-  version "1.8.0"
-  resolved "https://registry.yarnpkg.com/psl/-/psl-1.8.0.tgz#9326f8bcfb013adcc005fdff056acce020e51c24"
-  integrity sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ==
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-pstree.remy@^1.1.7:
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-  integrity sha512-quTtTeQJHYSxAwIBOCGEcQtqdVcFWX6mCFNoqnp+mRbq+Hxbs8CGgO/6oqfBx4OvxIOfCpgJWYVHswRXnbEu9Q==
-  dependencies:
-    bn.js "^4.11.9"
-    eth-lib "0.2.8"
-    ethereum-bloom-filters "^1.0.6"
-    ethjs-unit "0.1.6"
-    number-to-bn "1.7.0"
-    randombytes "^2.1.0"
-    utf8 "3.0.0"
-
-web3@^1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3/-/web3-1.5.2.tgz#736ca2f39048c63964203dd811f519400973e78d"
-  integrity sha512-aapKLdO8t7Cos6tZLeeQUtCJvTiPMlLcHsHHDLSBZ/VaJEucSTxzun32M8sp3BmF4waDEmhY+iyUM1BKvtAcVQ==
-  dependencies:
-    web3-bzz "1.5.2"
-    web3-core "1.5.2"
-    web3-eth "1.5.2"
-    web3-eth-personal "1.5.2"
-    web3-net "1.5.2"
-    web3-shh "1.5.2"
-    web3-utils "1.5.2"
-
-websocket@^1.0.32:
-  version "1.0.34"
-  resolved "https://registry.yarnpkg.com/websocket/-/websocket-1.0.34.tgz#2bdc2602c08bf2c82253b730655c0ef7dcab3111"
-  integrity sha512-PRDso2sGwF6kM75QykIesBijKSVceR6jL2G8NGYyq2XrItNC2P5/qL5XeR056GhA+Ly7JMFvJb9I312mJfmqnQ==
-  dependencies:
-    bufferutil "^4.0.1"
-    debug "^2.2.0"
-    es5-ext "^0.10.50"
-    typedarray-to-buffer "^3.1.5"
-    utf-8-validate "^5.0.2"
-    yaeti "^0.0.6"
-
-which-boxed-primitive@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"
-  integrity sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==
-  dependencies:
-    is-bigint "^1.0.1"
-    is-boolean-object "^1.1.0"
-    is-number-object "^1.0.4"
-    is-string "^1.0.5"
-    is-symbol "^1.0.3"
-
-which-typed-array@^1.1.2:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/which-typed-array/-/which-typed-array-1.1.6.tgz#f3713d801da0720a7f26f50c596980a9f5c8b383"
-  integrity sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==
-  dependencies:
-    available-typed-arrays "^1.0.4"
-    call-bind "^1.0.2"
-    es-abstract "^1.18.5"
-    foreach "^2.0.5"
-    has-tostringtag "^1.0.0"
-    is-typed-array "^1.1.6"
-
-widest-line@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/widest-line/-/widest-line-3.1.0.tgz#8292333bbf66cb45ff0de1603b136b7ae1496eca"
-  integrity sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==
-  dependencies:
-    string-width "^4.0.0"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
-
-write-file-atomic@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-3.0.3.tgz#56bd5c5a5c70481cd19c571bd39ab965a5de56e8"
-  integrity sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==
-  dependencies:
-    imurmurhash "^0.1.4"
-    is-typedarray "^1.0.0"
-    signal-exit "^3.0.2"
-    typedarray-to-buffer "^3.1.5"
-
-ws@^3.0.0:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-3.3.3.tgz#f1cf84fe2d5e901ebce94efaece785f187a228f2"
-  integrity sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==
-  dependencies:
-    async-limiter "~1.0.0"
-    safe-buffer "~5.1.0"
-    ultron "~1.1.0"
-
-xdg-basedir@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz#4bc8d9984403696225ef83a1573cbbcb4e79db13"
-  integrity sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==
-
-xhr-request-promise@^0.1.2:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz#2d5f4b16d8c6c893be97f1a62b0ed4cf3ca5f96c"
-  integrity sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==
-  dependencies:
-    xhr-request "^1.1.0"
-
-xhr-request@^1.0.1, xhr-request@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr-request/-/xhr-request-1.1.0.tgz#f4a7c1868b9f198723444d82dcae317643f2e2ed"
-  integrity sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==
-  dependencies:
-    buffer-to-arraybuffer "^0.0.5"
-    object-assign "^4.1.1"
-    query-string "^5.0.1"
-    simple-get "^2.7.0"
-    timed-out "^4.0.1"
-    url-set-query "^1.0.0"
-    xhr "^2.0.4"
-
-xhr2-cookies@1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz#7d77449d0999197f155cb73b23df72505ed89d48"
-  integrity sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=
-  dependencies:
-    cookiejar "^2.1.1"
-
-xhr@^2.0.4, xhr@^2.3.3:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/xhr/-/xhr-2.6.0.tgz#b69d4395e792b4173d6b7df077f0fc5e4e2b249d"
-  integrity sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==
-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
-  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
-
-yaeti@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
-
-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step25_web3_send_transaction_signed/.env.example b/step25_web3_send_transaction_signed/.env.example
new file mode 100755
index 0000000..ffd94fb
--- /dev/null
+++ b/step25_web3_send_transaction_signed/.env.example
@@ -0,0 +1,5 @@
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
+ACCOUNT2_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_2_PUBLIC_ADDRESS
+
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+ACCOUNT2_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_2_PRIVATE_KEY
diff --git a/step25_web3_send_transaction_signed/.gitignore b/step25_web3_send_transaction_signed/.gitignore
index 3dcb37e..ec308a9 100644
--- a/step25_web3_send_transaction_signed/.gitignore
+++ b/step25_web3_send_transaction_signed/.gitignore
@@ -1,2 +1,8 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
+
+# Environment Variables
+.env
diff --git a/step25_web3_send_transaction_signed/EthreumAccount.ts b/step25_web3_send_transaction_signed/EthreumAccount.ts
new file mode 100755
index 0000000..0ce4e4b
--- /dev/null
+++ b/step25_web3_send_transaction_signed/EthreumAccount.ts
@@ -0,0 +1,83 @@
+import Web3 from "web3";
+import { Transaction, TxData } from "ethereumjs-tx";
+
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class EthereumAccount {
+  private web3: Web3;
+  private privateKey?: string;
+  private address: string;
+
+  /**
+   * Instantiate an Ethereum Account object.
+   * @param address public address of the Ethereum account.
+   * @param privateKey (Optional) private key of the Ethereum account
+   */
+  constructor(address: string, privateKey?: string) {
+    this.address = address;
+    this.privateKey = privateKey;
+    this.web3 = new Web3(RPC_ENDPOINT);
+  }
+
+  /**
+   * Get the public address of the Ethereum account.
+   * @returns public address of the account.
+   */
+  getAddress = () => this.address;
+
+  /**
+   * Get the Ethers balance of the account.
+   * @returns Ethers in the account.
+   */
+  getBalance = async () => {
+    return await this.web3.eth
+      .getBalance(this.address)
+      .then(wei => this.web3.utils.fromWei(wei, "ether"));
+  };
+
+  /**
+   * Send Ethers from this account to another one with a signed transaction.
+   * @param receiverAddress public address of receiver's account.
+   * @param ethersAmount amount of Ethers to send.
+   * @param gasLimit maximumm amount of gas you want to allow for this transaction.
+   * @param gasPriceGwei gasPrice in Gwei you want to pay for this transaction.
+   * @returns transaction object for sending Ethers.
+   */
+  sendSignedTransaction = async (
+    receiverAddress: string,
+    ethersAmount: number,
+    gasLimit: number,
+    gasPriceGwei: number
+  ) => {
+    if (!this.privateKey) {
+      console.error("Private Key not provided!");
+      return;
+    }
+
+    // Build the transaction
+    const txCount = await this.web3.eth.getTransactionCount(this.address);
+    const txData: TxData = {
+      nonce: this.web3.utils.toHex(txCount),
+      to: receiverAddress,
+      value: this.web3.utils.toHex(
+        this.web3.utils.toWei(ethersAmount.toString(), "ether")
+      ),
+      gasLimit: this.web3.utils.toHex(gasLimit),
+      gasPrice: this.web3.utils.toHex(
+        this.web3.utils.toWei(gasPriceGwei.toString(), "gwei")
+      ),
+    };
+
+    // Sign the transaction
+    const tx = new Transaction(txData, { chain: "ropsten" });
+    tx.sign(Buffer.from(this.privateKey, "hex"));
+    const serializedTx = tx.serialize();
+    const rawTx = "0x" + serializedTx.toString("hex");
+
+    // Broadcast the transaction
+    return await this.web3.eth.sendSignedTransaction(rawTx);
+  };
+}
diff --git a/step25_web3_send_transaction_signed/images/changing_network_in_metamask.png b/step25_web3_send_transaction_signed/images/changing_network_in_metamask.png
new file mode 100644
index 0000000..c8d7e09
Binary files /dev/null and b/step25_web3_send_transaction_signed/images/changing_network_in_metamask.png differ
diff --git a/step25_web3_send_transaction_signed/images/screenshot_of_tx_ropsten.png b/step25_web3_send_transaction_signed/images/screenshot_of_tx_ropsten.png
new file mode 100644
index 0000000..0f20490
Binary files /dev/null and b/step25_web3_send_transaction_signed/images/screenshot_of_tx_ropsten.png differ
diff --git a/step25_web3_send_transaction_signed/index.ts b/step25_web3_send_transaction_signed/index.ts
index 6084460..38e5581 100644
--- a/step25_web3_send_transaction_signed/index.ts
+++ b/step25_web3_send_transaction_signed/index.ts
@@ -1,13 +1,43 @@
-import { SignedTransaction } from './signedTransaction';
+import { EthereumAccount } from "./EthreumAccount";
+import dotenv from "dotenv";
 
-const tx : SignedTransaction = new SignedTransaction();
+// Create a file named ".env" and write the environment variables as mentioned in ".env.example"
+dotenv.config({ path: "./.env" });
 
+const account1Address = process.env.ACCOUNT1_PUBLIC_ADDRESS;
+const account2Address = process.env.ACCOUNT2_PUBLIC_ADDRESS;
+const account1PrivateKey = process.env.ACCOUNT1_PRIVATE_KEY;
+const account2PrivateKey = process.env.ACCOUNT2_PRIVATE_KEY;
 
-tx.getAccountBalance('publicAddress').then(response => console.log(response));
+if (!account1Address || !account2Address) {
+  throw new Error(
+    "Account addresses must be provided as environment variables."
+  );
+}
 
+// Wrap in a function so we can use async/await.
+(async () => {
+  // Instantiate two Ethereum account objects with the given addresses.
+  const account1Obj = new EthereumAccount(account1Address, account1PrivateKey);
+  const account2Obj = new EthereumAccount(account2Address, account2PrivateKey);
 
-// send signed transaction from account 1 to account 2
-// You may want to save your private key in an env file
-tx.sendSignedTransaction('publicAddressAccount1','PrivateKeyAccount1','publicAddressAccount2',0.1,21000,10).then(response => console.log(response))
+  console.log("Before Transaction:");
+  console.log("Account 1 Balance ==>", await account1Obj.getBalance());
+  console.log("Account 2 Balance ==>", await account2Obj.getBalance());
 
+  console.log("Sending 1 Ether from Accout 1 to Account 2...");
+  const txData = await account1Obj.sendSignedTransaction(
+    account2Obj.getAddress(),
+    1,
+    21000,
+    10
+  );
+  console.log(
+    "Transaction on EtherScan:",
+    `https://ropsten.etherscan.io/tx/${txData?.transactionHash}`
+  );
 
+  console.log("After Transaction:");
+  console.log("Account 1 Balance ==>", await account1Obj.getBalance());
+  console.log("Account 2 Balance ==>", await account2Obj.getBalance());
+})();
diff --git a/step25_web3_send_transaction_signed/package-lock.json b/step25_web3_send_transaction_signed/package-lock.json
index 90f79cf..f12ea1e 100644
--- a/step25_web3_send_transaction_signed/package-lock.json
+++ b/step25_web3_send_transaction_signed/package-lock.json
@@ -1,17 +1,20 @@
 {
-  "name": "step21_web3_node_getbalance",
+  "name": "step25",
   "version": "1.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
+      "name": "step25",
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "ethereumjs-tx": "^2.1.2",
         "web3": "^1.5.2"
       },
       "devDependencies": {
         "@types/node": "^12.20.19",
+        "dotenv": "^10.0.0",
         "nodemon": "^2.0.12",
         "ts-node-dev": "^1.1.8",
         "tslint": "^6.1.3"
@@ -61,6 +64,35 @@
         "ethereumjs-util": "^7.1.0"
       }
     },
+    "node_modules/@ethereumjs/common/node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@ethereumjs/common/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+      "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "ethjs-util": "0.1.6",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@ethereumjs/tx": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.3.0.tgz",
@@ -70,6 +102,35 @@
         "ethereumjs-util": "^7.1.0"
       }
     },
+    "node_modules/@ethereumjs/tx/node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@ethereumjs/tx/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@ethereumjs/tx/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+      "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "ethjs-util": "0.1.6",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@ethersproject/abi": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.0.7.tgz",
@@ -273,9 +334,9 @@
       }
     },
     "node_modules/@ethersproject/logger": {
-      "version": "5.4.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.4.0.tgz",
-      "integrity": "sha512-xYdWGGQ9P2cxBayt64d8LC8aPFJk6yWCawQi/4eJ4+oJdMMjEBMrIcIMZ9AxhwpPVmnBPrsB10PcXGmGAqgUEQ==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.4.1.tgz",
+      "integrity": "sha512-DZ+bRinnYLPw1yAC64oRl0QyVZj43QeHIhVKfD/+YwSz4wsv1pfwb5SOFjz+r710YEWzU6LrhuSjpSO+6PeE4A==",
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     "hash.js": {
@@ -7659,12 +7888,13 @@
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     },
     "keccak": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/keccak/-/keccak-3.0.1.tgz",
-      "integrity": "sha512-epq90L9jlFWCW7+pQa6JOnKn2Xgl2mtI664seYR6MHskvI9agt7AnDqmAlp9TqU4/caMYbA08Hi5DMZAl5zdkA==",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/keccak/-/keccak-3.0.2.tgz",
+      "integrity": "sha512-PyKKjkH53wDMLGrvmRGSNWgmSxZOUqbnXwKL9tmgbFYA1iAYqW21kfR7mZXV0MlESiefxQQE9X9fTa3X+2MPDQ==",
       "requires": {
         "node-addon-api": "^2.0.0",
-        "node-gyp-build": "^4.2.0"
+        "node-gyp-build": "^4.2.0",
+        "readable-stream": "^3.6.0"
       }
     },
     "keyv": {
@@ -7837,9 +8067,10 @@
       "integrity": "sha512-qYvlv/exQ4+svI3UOvPUpLDF0OMX5euvUH0Ny4N5QyRyhNdgAgUrVH3iUINSzEPLvx0kbo/Bp28GJKIqvE7URw=="
     },
     "ms": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true
     },
     "multibase": {
       "version": "0.6.1",
@@ -7920,23 +8151,6 @@
         "touch": "^3.1.0",
         "undefsafe": "^2.0.3",
         "update-notifier": "^4.1.0"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "3.2.7",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
-          "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
-          "dev": true,
-          "requires": {
-            "ms": "^2.1.1"
-          }
-        },
-        "ms": {
-          "version": "2.1.3",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-          "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-          "dev": true
-        }
       }
     },
     "nopt": {
@@ -8377,9 +8591,9 @@
       }
     },
     "safe-buffer": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
     },
     "safer-buffer": {
       "version": "2.1.2",
@@ -8444,6 +8658,21 @@
         "statuses": "~1.5.0"
       },
       "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          },
+          "dependencies": {
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+            }
+          }
+        },
         "ms": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
@@ -8578,13 +8807,6 @@
       "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
       "requires": {
         "safe-buffer": "~5.2.0"
-      },
-      "dependencies": {
-        "safe-buffer": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
-        }
       }
     },
     "string-width": {
@@ -8739,11 +8961,6 @@
           "requires": {
             "minimist": "^1.2.5"
           }
-        },
-        "safe-buffer": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
         }
       }
     },
@@ -8934,9 +9151,9 @@
       }
     },
     "typescript": {
-      "version": "4.3.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
-      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.4.2.tgz",
+      "integrity": "sha512-gzP+t5W4hdy4c+68bfcv0t400HVJMMd2+H9B7gae1nQlBzCqvrXX+6GL/b3GAgyTH966pzrZ70/fRjwAtZksSQ==",
       "dev": true,
       "peer": true
     },
@@ -8963,6 +9180,23 @@
       "dev": true,
       "requires": {
         "debug": "^2.2.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
+        }
       }
     },
     "unique-string": {
@@ -9278,6 +9512,14 @@
         "web3-utils": "1.5.2"
       },
       "dependencies": {
+        "@types/bn.js": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+          "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+          "requires": {
+            "@types/node": "*"
+          }
+        },
         "eth-lib": {
           "version": "0.2.8",
           "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.8.tgz",
@@ -9288,6 +9530,26 @@
             "xhr-request-promise": "^0.1.2"
           }
         },
+        "ethereumjs-util": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+          "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+          "requires": {
+            "@types/bn.js": "^5.1.0",
+            "bn.js": "^5.1.2",
+            "create-hash": "^1.1.2",
+            "ethereum-cryptography": "^0.1.3",
+            "ethjs-util": "0.1.6",
+            "rlp": "^2.2.4"
+          },
+          "dependencies": {
+            "bn.js": {
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+              "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+            }
+          }
+        },
         "uuid": {
           "version": "3.3.2",
           "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
@@ -9433,6 +9695,21 @@
         "typedarray-to-buffer": "^3.1.5",
         "utf-8-validate": "^5.0.2",
         "yaeti": "^0.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        }
       }
     },
     "which-boxed-primitive": {
@@ -9494,6 +9771,13 @@
         "async-limiter": "~1.0.0",
         "safe-buffer": "~5.1.0",
         "ultron": "~1.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
       }
     },
     "xdg-basedir": {
diff --git a/step25_web3_send_transaction_signed/package.json b/step25_web3_send_transaction_signed/package.json
index 0bcaf56..b1c1d77 100644
--- a/step25_web3_send_transaction_signed/package.json
+++ b/step25_web3_send_transaction_signed/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
@@ -15,6 +15,7 @@
   },
   "devDependencies": {
     "@types/node": "^12.20.19",
+    "dotenv": "^10.0.0",
     "nodemon": "^2.0.12",
     "ts-node-dev": "^1.1.8",
     "tslint": "^6.1.3"
diff --git a/step25_web3_send_transaction_signed/readme.md b/step25_web3_send_transaction_signed/readme.md
index 00f9dde..89191f7 100644
--- a/step25_web3_send_transaction_signed/readme.md
+++ b/step25_web3_send_transaction_signed/readme.md
@@ -1,25 +1,77 @@
-# Send Signed Transaction
+# Step 25: Send Signed Transaction
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=uFdjZ-B3GCM&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=3)
+## References:
 
-This step covers the latter part of the video.
+1.  We will follow the latter part of this [video tutorial](https://www.youtube.com/watch?v=uFdjZ-B3GCM&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=3) in this step.
 
-In this step we are sending ethers from account 1 to account 2 on ropston network. 
+## Step 1
 
-You can create an account using metamask for this step and load it with test ethers from a ropston faucet like https://faucet.ropsten.be/
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
+
+Add `ethereumjs-tx` for signing the transactions and `dotenv` for working with environment variables.
+
+```bash
+npm i ethereumjs-tx
+npm i -D dotenv
+```
+
+## Step 2
+
+Download MetaMask wallet (for Chrome use this [extension](https://chrome.google.com/webstore/detail/metamask/nkbihfbeogaeaoehlefnkodbefgpgknn)) and create two accounts in the wallet (one account will be created automatically when first creating the wallet). Get some fake ETH from a faucet for one of your accounts. Following are some of the faucets available on Ropsten Public Test Network:
+
+1.  [Ropsten Ethereum (rETH) Faucet](https://faucet.dimensions.network/)
+2.  [Throttled Testnet Faucet](https://ipfs.io/ipfs/QmVAwVKys271P5EQyEfVSxm7BJDKWt42A2gHvNmxLjZMps/)
+3.  [Ropsten Ethereum Faucet](https://faucet.ropsten.be/)
+
+Connect your MetaMask wallet to Ropsten Test Network (as in the following figure) to check if you have received ETH.
+
+
+   +
+
+
+## Step 3
+
+Create a `.env` file and save some environment variables in it in the format given in `.env.example`.
+
+```
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
+ACCOUNT2_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_2_PUBLIC_ADDRESS
+
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+ACCOUNT2_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_2_PRIVATE_KEY
+```
+
+## Step 4
+
+Create `EthereumAccount.ts` and `index.ts` files. In `EthereumAccount.ts`, replace INFURA_PROJECT_ID with your Infura project ID.
+
+```ts
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
 
 You will see in the code that here we have explicitly signed our transaction using the private key. This is how you should go about sending transactions in a public block chain where the nodes cannot be trusted with your private keys.
 
-npm link typescript
+## Step 5
 
+Run the project with the following command:
+
+```bash
+npm link typescript
 npm start
+```
 
-or
+or with these commands.
 
+```bash
 tsc
-
 node index
+```
 
+After the transaction, the balances of the two accounts used will be updated in MetaMask wallet as well. In the console, a link to [ropsten.etherscan.io](https://ropsten.etherscan.io/) will be printed. You can see that this transaction is now a part of Ropsten Public Test Network.
 
-
-
+
+   +
+
diff --git a/step25_web3_send_transaction_signed/signedTransaction.ts b/step25_web3_send_transaction_signed/signedTransaction.ts
deleted file mode 100644
index e6119ae..0000000
--- a/step25_web3_send_transaction_signed/signedTransaction.ts
+++ /dev/null
@@ -1,54 +0,0 @@
-import Web3 from 'web3';
-import {Transaction} from 'ethereumjs-tx'
-
-export class SignedTransaction {
-    private web3: Web3
-   
-    public constructor() {
-
-      // use ropsten endpoint here (dont use main because we are just sending ethers for testing)
-        this.web3 = new Web3("USE_ROPSTON_ENDPOINT");
-    }
-
-
-    // check account balance for any account
-    public async getAccountBalance(account:string) {
-      const balance =  await this.web3.eth.getBalance(account)
-      return this.web3.utils.fromWei(balance,'ether')
-    }
-
-
-    public async sendSignedTransaction(senderPublicAddress:string,senderPrivateKey:string, recieverPublicAddress:string,ethers:number,gasLimit:number,gasPriceGwei:number) {
-
-      //----------------create transaction 
-
-      // we are getting the last transaction number for nonce
-     const senderTransactionCount = await this.web3.eth.getTransactionCount(senderPublicAddress)
-
-     // everything needs to be in hex
-     const txObject = {
-       nonce: this.web3.utils.toHex(senderTransactionCount),
-       to: recieverPublicAddress,
-       value: this.web3.utils.toHex(this.web3.utils.toWei(ethers.toString(),'ether')),
-       gasLimit: this.web3.utils.toHex(gasLimit),
-       gasPrice: this.web3.utils.toHex(this.web3.utils.toWei(gasPriceGwei.toString(),'gwei'))
-
-     }
-
-     //-----------------sign the transaction
-
-     const tx = new Transaction(txObject, {chain: 'ropsten'})
-     tx.sign(Buffer.from(senderPrivateKey,'hex'))
-     const serializeTx = tx.serialize()
-     const rawTx = '0x' + serializeTx.toString('hex')
-
-     //------------------broadcast the transaction 
-
-    return await this.web3.eth.sendSignedTransaction(rawTx)
-
-    }
-
-   
-
-  }
-
diff --git a/step25_web3_send_transaction_signed/tsconfig.json b/step25_web3_send_transaction_signed/tsconfig.json
index 07d2004..a24a581 100644
--- a/step25_web3_send_transaction_signed/tsconfig.json
+++ b/step25_web3_send_transaction_signed/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step25_web3_send_transaction_signed/tslint.json b/step25_web3_send_transaction_signed/tslint.json
index 24388b8..a64df52 100644
--- a/step25_web3_send_transaction_signed/tslint.json
+++ b/step25_web3_send_transaction_signed/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step25_web3_send_transaction_signed/yarn.lock b/step25_web3_send_transaction_signed/yarn.lock
deleted file mode 100644
index 7b89b82..0000000
--- a/step25_web3_send_transaction_signed/yarn.lock
+++ /dev/null
@@ -1,3632 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@babel/code-frame@^7.0.0":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.14.5.tgz#23b08d740e83f49c5e59945fbf1b43e80bbf4edb"
-  integrity sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==
-  dependencies:
-    "@babel/highlight" "^7.14.5"
-
-"@babel/helper-validator-identifier@^7.14.5":
-  version "7.14.9"
-  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz#6654d171b2024f6d8ee151bf2509699919131d48"
-  integrity sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==
-
-"@babel/highlight@^7.14.5":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.14.5.tgz#6861a52f03966405001f6aa534a01a24d99e8cd9"
-  integrity sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==
-  dependencies:
-    "@babel/helper-validator-identifier" "^7.14.5"
-    chalk "^2.0.0"
-    js-tokens "^4.0.0"
-
-"@ethereumjs/common@^2.3.0", "@ethereumjs/common@^2.4.0":
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/@ethereumjs/common/-/common-2.4.0.tgz#2d67f6e6ba22246c5c89104e6b9a119fb3039766"
-  integrity sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==
-  dependencies:
-    crc-32 "^1.2.0"
-    ethereumjs-util "^7.1.0"
-
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-  integrity sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==
-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
-  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
-
-yaeti@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
-
-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step26_web3_deploy_contract/.env.example b/step26_web3_deploy_contract/.env.example
new file mode 100755
index 0000000..ffd94fb
--- /dev/null
+++ b/step26_web3_deploy_contract/.env.example
@@ -0,0 +1,5 @@
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
+ACCOUNT2_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_2_PUBLIC_ADDRESS
+
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+ACCOUNT2_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_2_PRIVATE_KEY
diff --git a/step26_web3_deploy_contract/.gitignore b/step26_web3_deploy_contract/.gitignore
index 0e3a4c6..ec308a9 100644
--- a/step26_web3_deploy_contract/.gitignore
+++ b/step26_web3_deploy_contract/.gitignore
@@ -1,3 +1,8 @@
+# Node packages
 node_modules
+
+# Build files created by TypeScript Compiler
 *.js
-types
\ No newline at end of file
+
+# Environment Variables
+.env
diff --git a/step26_web3_deploy_contract/EthreumAccount.ts b/step26_web3_deploy_contract/EthreumAccount.ts
new file mode 100755
index 0000000..a985e65
--- /dev/null
+++ b/step26_web3_deploy_contract/EthreumAccount.ts
@@ -0,0 +1,117 @@
+import Web3 from "web3";
+import { Transaction, TxData } from "ethereumjs-tx";
+
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class EthereumAccount {
+  private web3: Web3;
+  private privateKey?: string;
+  private address: string;
+
+  /**
+   * Instantiate an Ethereum Account object.
+   * @param address public address of the Ethereum account.
+   * @param privateKey (Optional) private key of the Ethereum account
+   */
+  constructor(address: string, privateKey?: string) {
+    this.address = address;
+    this.privateKey = privateKey;
+    this.web3 = new Web3(RPC_ENDPOINT);
+  }
+
+  /**
+   * Get the public address of the Ethereum account.
+   * @returns public address of the account.
+   */
+  getAddress = () => this.address;
+
+  /**
+   * Get the Ethers balance of the account.
+   * @returns Ethers in the account.
+   */
+  getBalance = async () => {
+    return await this.web3.eth
+      .getBalance(this.address)
+      .then(wei => this.web3.utils.fromWei(wei, "ether"));
+  };
+
+  /**
+   * Signs and sends the transaction to Ethereum block chain.
+   * @param txDataParam data for the transaction.
+   * @returns transaction object for the transaction.
+   */
+  private signAndSendTransaction = async (
+    txDataParam: Omit
+  ) => {
+    if (!this.privateKey) {
+      console.error("Private Key not provided!");
+      return;
+    }
+
+    // Build the transaction
+    const txCount = await this.web3.eth.getTransactionCount(this.address);
+    const txData: TxData = {
+      ...txDataParam,
+      nonce: this.web3.utils.toHex(txCount),
+    };
+
+    // Sign the transaction
+    const tx = new Transaction(txData, { chain: "ropsten" });
+    tx.sign(Buffer.from(this.privateKey, "hex"));
+    const serializedTx = tx.serialize();
+    const rawTx = "0x" + serializedTx.toString("hex");
+
+    // Broadcast the transaction
+    return await this.web3.eth.sendSignedTransaction(rawTx);
+  };
+
+  /**
+   * Send Ethers from this account to another one with a signed transaction.
+   * @param receiverAddress public address of receiver's account.
+   * @param ethersAmount amount of Ethers to send.
+   * @param gasLimit maximumm amount of gas you want to allow for this transaction.
+   * @param gasPriceGwei gasPrice in Gwei you want to pay for this transaction.
+   * @returns transaction object for sending Ethers.
+   */
+  sendSignedTransaction = async (
+    receiverAddress: string,
+    ethersAmount: number,
+    gasLimit: number,
+    gasPriceGwei: number
+  ) => {
+    return await this.signAndSendTransaction({
+      to: receiverAddress,
+      value: this.web3.utils.toHex(
+        this.web3.utils.toWei(ethersAmount.toString(), "ether")
+      ),
+      gasLimit: this.web3.utils.toHex(gasLimit),
+      gasPrice: this.web3.utils.toHex(
+        this.web3.utils.toWei(gasPriceGwei.toString(), "gwei")
+      ),
+    });
+  };
+
+  /**
+   * Deploy a smart contract to Ethereum block chain.
+   * @param smartContractByteCode bytecode of the compiled smart contract.
+   * @param gasLimit maximumm amount of gas you want to allow for this transaction.
+   * @param gasPriceGwei gasPrice in Gwei you want to pay for this transaction.
+   * @returns transaction object for deploying the smart contract.
+   */
+  deploySmartContract = async (
+    smartContractByteCode: string,
+    gasLimit: number,
+    gasPriceGwei: number
+  ) => {
+    return await this.signAndSendTransaction({
+      gasLimit: this.web3.utils.toHex(gasLimit),
+      gasPrice: this.web3.utils.toHex(
+        this.web3.utils.toWei(gasPriceGwei.toString(), "gwei")
+      ),
+      data: smartContractByteCode,
+    });
+  };
+}
diff --git a/step26_web3_deploy_contract/SmartContract.ts b/step26_web3_deploy_contract/SmartContract.ts
new file mode 100644
index 0000000..04456a5
--- /dev/null
+++ b/step26_web3_deploy_contract/SmartContract.ts
@@ -0,0 +1,45 @@
+import Web3 from "web3";
+import EthContract from "web3-eth-contract";
+
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class SmartContract {
+  protected web3: Web3;
+  protected contractAddress: string;
+  protected abi: string;
+  protected contract: EthContract.Contract;
+
+  /**
+   * Object representing a contract on Ethereum.
+   * @param contractAddress address of the contract on Ethereum network.
+   * @param abi ABI of the contract.
+   */
+  public constructor(contractAddress: string, abi: string) {
+    this.contractAddress = contractAddress;
+    this.abi = abi;
+    this.web3 = new Web3(RPC_ENDPOINT);
+    this.contract = new this.web3.eth.Contract(
+      JSON.parse(this.abi),
+      this.contractAddress
+    );
+  }
+
+  /**
+   * Get the public address of the contract on Ethereum network.
+   * @returns public address of the contract.
+   */
+  public getContractAddress(): string {
+    return this.contractAddress;
+  }
+
+  /**
+   * Get the public address of current owner of the smart contract.
+   * @returns public address of current owner of the smart contract.
+   */
+  getContractOwner = async () => {
+    return await this.contract.methods.getOwner().call();
+  };
+}
diff --git a/step26_web3_deploy_contract/abi/contractABI.json b/step26_web3_deploy_contract/abi/contractABI.json
new file mode 100755
index 0000000..3a48176
--- /dev/null
+++ b/step26_web3_deploy_contract/abi/contractABI.json
@@ -0,0 +1,52 @@
+[
+  {
+    "inputs": [],
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "oldOwner",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "OwnerSet",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "changeOwner",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "getOwner",
+    "outputs": [
+      {
+        "internalType": "address",
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  }
+]
diff --git a/step26_web3_deploy_contract/deploySmartContract.ts b/step26_web3_deploy_contract/deploySmartContract.ts
deleted file mode 100644
index 0c5dad4..0000000
--- a/step26_web3_deploy_contract/deploySmartContract.ts
+++ /dev/null
@@ -1,60 +0,0 @@
-import Web3 from 'web3';
-import {Transaction} from 'ethereumjs-tx'
-
-
-export class DeploySmartContract {
-    private web3: Web3
-   
-    public constructor() {
-
-      // use ropsten endpoint here (dont use main because we are just sending ethers for testing)
-        this.web3 = new Web3("Your ropsten endpoint");
-    }
-
-
-    public async deploy(publicAddress:string,PrivateKey:string,gasLimit:number,gasPriceGwei:number,data:string) {
-
-      //----------------create transaction 
-
-      // we are getting the last transaction number for nonce
-     const senderTransactionCount = await this.web3.eth.getTransactionCount(publicAddress)
-
-
-     // everything needs to be in hex
-     const txObject = {
-       nonce: this.web3.utils.toHex(senderTransactionCount),
-       gasLimit: this.web3.utils.toHex(gasLimit),
-       gasPrice: this.web3.utils.toHex(this.web3.utils.toWei(gasPriceGwei.toString(),'gwei')),
-       data: data
-
-     }
-
-     //-----------------sign the transaction
-
-     const tx = new Transaction(txObject, {chain: 'ropsten'})
-     tx.sign(Buffer.from(PrivateKey,'hex'))
-     const serializeTx = tx.serialize()
-     const rawTx = '0x' + serializeTx.toString('hex')
-
-     //------------------broadcast the transaction 
-
-    return await this.web3.eth.sendSignedTransaction(rawTx)
-
-    }
-
-
-    public interact(contractAddress:string,contractAbi:any) {
-
-      
-      return new this.web3.eth.Contract(contractAbi,contractAddress);
-
-
-
-    }
-
-
-    
-   
-
-  }
-
diff --git a/step26_web3_deploy_contract/imgs/after_compilation.png b/step26_web3_deploy_contract/imgs/after_compilation.png
new file mode 100644
index 0000000..ec236be
Binary files /dev/null and b/step26_web3_deploy_contract/imgs/after_compilation.png differ
diff --git a/step26_web3_deploy_contract/imgs/after_deploying_contract.png b/step26_web3_deploy_contract/imgs/after_deploying_contract.png
new file mode 100644
index 0000000..b44c23f
Binary files /dev/null and b/step26_web3_deploy_contract/imgs/after_deploying_contract.png differ
diff --git a/step26_web3_deploy_contract/imgs/compilationDetails.png b/step26_web3_deploy_contract/imgs/compilationDetails.png
deleted file mode 100644
index 201b137..0000000
Binary files a/step26_web3_deploy_contract/imgs/compilationDetails.png and /dev/null differ
diff --git a/step26_web3_deploy_contract/imgs/compileSmartContract.png b/step26_web3_deploy_contract/imgs/compileSmartContract.png
index 0d71a60..ec24815 100644
Binary files a/step26_web3_deploy_contract/imgs/compileSmartContract.png and b/step26_web3_deploy_contract/imgs/compileSmartContract.png differ
diff --git a/step26_web3_deploy_contract/imgs/compiledSmartContract.png b/step26_web3_deploy_contract/imgs/compiledSmartContract.png
deleted file mode 100644
index 9b3d574..0000000
Binary files a/step26_web3_deploy_contract/imgs/compiledSmartContract.png and /dev/null differ
diff --git a/step26_web3_deploy_contract/imgs/open_2_owner.png b/step26_web3_deploy_contract/imgs/open_2_owner.png
new file mode 100644
index 0000000..4af69ad
Binary files /dev/null and b/step26_web3_deploy_contract/imgs/open_2_owner.png differ
diff --git a/step26_web3_deploy_contract/index.ts b/step26_web3_deploy_contract/index.ts
index 05a8bd8..fffb82b 100644
--- a/step26_web3_deploy_contract/index.ts
+++ b/step26_web3_deploy_contract/index.ts
@@ -1,32 +1,55 @@
-import { DeploySmartContract } from './deploySmartContract';
-
-const contract : DeploySmartContract = new DeploySmartContract();
-
-
-// first of all write your smart contract in solidity and compile it. You can do this in remix IDE
-
-// enter the hexadecimal of your binary code of smart contract. You can complile your smart contract in remix ide and get this from there.
-const data:string= 'enter data of your smart contract (hexadecimal string of binary code)' 
-
-
-//You may want to save your private key in an env file
-contract.deploy('publicAddressOfOwnerOfSmartContract','OwnerPrivateKey',1000000,10,data).then(response => console.log(response))
-
-
-
-// after you have deployed your contract you can uncomment the code below and enter your contract's ABI and public address to interact with it.
-
-
-/*
- const contractAbi = "enter your contract's abi"
- const contract_obj = contract.interact('contractPublicAddress',contractAbi)
-
-
- // you can now use contract_obj to call methods on your contract, for example:
- contract_obj.methods.name().call().then((res:string)=>console.log(res))
- 
- */
- 
-
- 
-
+import dotenv from "dotenv";
+import { EthereumAccount } from "./EthreumAccount";
+import { SmartContract } from "./SmartContract";
+import CONTRACT_ABI from "./abi/contractABI.json";
+
+// Create a file named ".env" and write the environment variables as mentioned in ".env.example"
+dotenv.config({ path: "./.env" });
+
+const publicAddress = process.env.ACCOUNT1_PUBLIC_ADDRESS;
+const privateKey = process.env.ACCOUNT1_PRIVATE_KEY;
+const smartContractByteCode =
+  "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";
+
+if (!publicAddress || !privateKey) {
+  throw new Error(
+    "Account address and private key must be provided as environment variables."
+  );
+}
+
+// Wrap in a function so we can use async/await.
+/* *************************************************** */
+/* **** Following code deploys the smart contract **** */
+/* *************************************************** */
+(async () => {
+  // Instantiate Ethereum account object.
+  const accountObj = new EthereumAccount(publicAddress, privateKey);
+
+  console.log("Deploying the smart contract to Ropsten Test Network...");
+  const txData = await accountObj.deploySmartContract(
+    smartContractByteCode,
+    // Deploying a smart contract requires a lot more gas than sending ethers.
+    1000000,
+    10
+  );
+  console.log(
+    "EtherScan Link:",
+    `https://ropsten.etherscan.io/tx/${txData?.transactionHash}`
+  );
+  console.log("Contract Address:", txData?.contractAddress);
+})();
+
+/* ********************************************************************* */
+/* ***** Interact with the smart contract (Uncomment the following ***** */
+/* ****************** and comment the above function) ****************** */
+/* ********************************************************************* */
+// (async () => {
+//   const contractAddress = "CONTRACT_ADDRESS";
+//   const contractObj = new SmartContract(
+//     contractAddress,
+//     JSON.stringify(CONTRACT_ABI)
+//   );
+
+//   console.log("Contract Address:", await contractObj.getContractAddress());
+//   console.log("Contract Owner:", await contractObj.getContractOwner());
+// })();
diff --git a/step26_web3_deploy_contract/package-lock.json b/step26_web3_deploy_contract/package-lock.json
index 29aafaf..c3af108 100644
--- a/step26_web3_deploy_contract/package-lock.json
+++ b/step26_web3_deploy_contract/package-lock.json
@@ -1,8 +1,5544 @@
 {
-  "name": "step25",
+  "name": "step26",
   "version": "1.0.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "step26",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "ethereumjs-tx": "^2.1.2",
+        "web3": "^1.5.2"
+      },
+      "devDependencies": {
+        "@types/node": "^12.20.19",
+        "dotenv": "^10.0.0",
+        "nodemon": "^2.0.12",
+        "ts-node-dev": "^1.1.8",
+        "tslint": "^6.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.14.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
+      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@ethereumjs/common": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.4.0.tgz",
+      "integrity": "sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==",
+      "dependencies": {
+        "crc-32": "^1.2.0",
+        "ethereumjs-util": "^7.1.0"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
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@@ -3397,27 +8970,6 @@
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-      "integrity": "sha1-Edpv9nDzRxpztiXKTz/c97t0gpE=",
-      "dev": true,
-      "requires": {
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       "resolved": "https://registry.npmjs.org/timed-out/-/timed-out-4.0.1.tgz",
@@ -3466,12 +9018,6 @@
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       "dev": true
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-    "ts-essentials": {
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-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-9.1.1.tgz",
@@ -3596,58 +9142,6 @@
         "mime-types": "~2.1.24"
       }
     },
-    "typechain": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/typechain/-/typechain-5.1.2.tgz",
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-      "dev": true,
-      "requires": {
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-        "debug": "^4.1.1",
-        "fs-extra": "^7.0.0",
-        "glob": "^7.1.6",
-        "js-sha3": "^0.8.0",
-        "lodash": "^4.17.15",
-        "mkdirp": "^1.0.4",
-        "prettier": "^2.1.2",
-        "ts-essentials": "^7.0.1"
-      },
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-            "jsonfile": "^4.0.0",
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-          "dev": true
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-          "dev": true
-        }
-      }
-    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -3656,11 +9150,12 @@
         "is-typedarray": "^1.0.0"
       }
     },
-    "typical": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
-      "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0=",
-      "dev": true
+    "typescript": {
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.4.2.tgz",
+      "integrity": "sha512-gzP+t5W4hdy4c+68bfcv0t400HVJMMd2+H9B7gae1nQlBzCqvrXX+6GL/b3GAgyTH966pzrZ70/fRjwAtZksSQ==",
+      "dev": true,
+      "peer": true
     },
     "ultron": {
       "version": "1.1.1",
@@ -3685,6 +9180,23 @@
       "dev": true,
       "requires": {
         "debug": "^2.2.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
+        }
       }
     },
     "unique-string": {
@@ -4000,6 +9512,14 @@
         "web3-utils": "1.5.2"
       },
       "dependencies": {
+        "@types/bn.js": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+          "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+          "requires": {
+            "@types/node": "*"
+          }
+        },
         "eth-lib": {
           "version": "0.2.8",
           "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.8.tgz",
@@ -4010,6 +9530,26 @@
             "xhr-request-promise": "^0.1.2"
           }
         },
+        "ethereumjs-util": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+          "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+          "requires": {
+            "@types/bn.js": "^5.1.0",
+            "bn.js": "^5.1.2",
+            "create-hash": "^1.1.2",
+            "ethereum-cryptography": "^0.1.3",
+            "ethjs-util": "0.1.6",
+            "rlp": "^2.2.4"
+          },
+          "dependencies": {
+            "bn.js": {
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+              "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+            }
+          }
+        },
         "uuid": {
           "version": "3.3.2",
           "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
@@ -4155,6 +9695,21 @@
         "typedarray-to-buffer": "^3.1.5",
         "utf-8-validate": "^5.0.2",
         "yaeti": "^0.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        }
       }
     },
     "which-boxed-primitive": {
@@ -4170,16 +9725,16 @@
       }
     },
     "which-typed-array": {
-      "version": "1.1.6",
-      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.6.tgz",
-      "integrity": "sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==",
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.7.tgz",
+      "integrity": "sha512-vjxaB4nfDqwKI0ws7wZpxIlde1XrLX5uB0ZjpfshgmapJMD7jJWhZI+yToJTqaFByF0eNBcYxbjmCzoRP7CfEw==",
       "requires": {
-        "available-typed-arrays": "^1.0.4",
+        "available-typed-arrays": "^1.0.5",
         "call-bind": "^1.0.2",
         "es-abstract": "^1.18.5",
         "foreach": "^2.0.5",
         "has-tostringtag": "^1.0.0",
-        "is-typed-array": "^1.1.6"
+        "is-typed-array": "^1.1.7"
       }
     },
     "widest-line": {
@@ -4216,6 +9771,13 @@
         "async-limiter": "~1.0.0",
         "safe-buffer": "~5.1.0",
         "ultron": "~1.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
       }
     },
     "xdg-basedir": {
diff --git a/step26_web3_deploy_contract/package.json b/step26_web3_deploy_contract/package.json
index 20f1321..6e95157 100644
--- a/step26_web3_deploy_contract/package.json
+++ b/step26_web3_deploy_contract/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
@@ -15,6 +15,7 @@
   },
   "devDependencies": {
     "@types/node": "^12.20.19",
+    "dotenv": "^10.0.0",
     "nodemon": "^2.0.12",
     "ts-node-dev": "^1.1.8",
     "tslint": "^6.1.3"
diff --git a/step26_web3_deploy_contract/readme.md b/step26_web3_deploy_contract/readme.md
index f93bbf6..38202d9 100644
--- a/step26_web3_deploy_contract/readme.md
+++ b/step26_web3_deploy_contract/readme.md
@@ -1,45 +1,103 @@
-# Deploy Smart Contract
+# Step 26: Deploy Smart Contract
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=msT3tpwnyv8&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=4)
+## References:
 
+1.  We will follow this [video tutorial](https://www.youtube.com/watch?v=msT3tpwnyv8&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=4) in this step.
 
-In this step we are deploying a smart contract from web3js. 
+## Step 1
 
-## step 1:
-Write a smart contract in remix ide. Remix also provides you with some sample smart contracts you can just use them.
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-## step 2:
-Compile the smart contract on remix.
+Add `ethereumjs-tx` for signing the transactions and `dotenv` for working with environment variables.
 
->
+```bash
+npm i ethereumjs-tx
+npm i -D dotenv
+```
 
-## step3:
-click on compilation details.
+## Step 2
 
->
+In [Step 25](../step25_web3_send_transaction_signed), you created a MetaMask wallet. We will use the same account in this step. Make sure that your account has some fake ETH for Ropsten Public Test Network.
 
-## step 4:
-The text in the green box is your smart contract's ABI and the blue box shows you the data of your smart contract (hexadecimal string of the binary code of smart contract). You will need the ABI and Data in this step to deploy your smart contract from web3js. 
+## Step 3
 
->
+Create a `.env` file and save some environment variables in it in the format given in `.env.example`. In this step, we need only one account.
 
+```
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
 
-You can create an account using metamask for this step and load it with test ethers from a ropston faucet like https://faucet.ropsten.be/
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+```
 
-You will see in the code that here we have explicitly signed our transaction (smart contract creation) using the private key. This is how you should go about sending transactions in a public block chain where the nodes cannot be trusted with your private keys. 
+## Step 4:
 
-Note: This is the fully manual way of signing and deploying your smart contract. If you want to sign your transaction with metamask then you have to provide your private key like this. Metamask handles everything for you and the code for signing with metamask is also slightly different.
+Write a smart contract in [Remix IDE](https://remix.ethereum.org/). Remix also provides you with some sample smart contracts. Here, we will use the `2_Owner.sol` sample contract provided by Remix IDE. Open the contract from the file explorer section like in the figure below.
 
-npm link typescript
+
+   +
+
+
+From the toolbar on the left, open `Solidity Comiler`. Now, compile `2_Owner.sol` smart contract as shown below.
+
+
+   +
+
+
+After compilation you can copy the smart contract ABI and Bytecode as highlighted below.
+
+
+   +
+
+
+Create `contractABI.json`, and paste the ABI there.
+
+## Step 5
+
+Create `EthereumAccount.ts`, `SmartContract.ts` and `index.ts` files. You can see this time we have added two methods in `EthereumAccount` class in `EthereumAccount.ts` file. One is the `deploySmartContract` method which deploys the smart contract. The other one is a private method `signAndSendTransaction`. This method signs and sends the transaction to Ethereum. It is created just to avoid code duplication in `deploySmartContract` and `sendSignedTransaction`.
+
+In both `EthereumAccount.ts` and `SmartContract.ts`, replace INFURA_PROJECT_ID with your Infura project ID.
 
+```ts
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
+
+In `index.ts`, paste the contract bytecode.
+
+```ts
+const smartContractByteCode = "PASTE_CONTRACT_BYTECODE";
+```
+
+## Step 5
+
+Run the project with the following command:
+
+```bash
+npm link typescript
 npm start
+```
 
-or
+or with these commands.
 
+```bash
 tsc
-
 node index
+```
+
+In the console, a link to [ropsten.etherscan.io](https://ropsten.etherscan.io/) will be printed. You can see that this transaction that deployed the smart contract is now a part of Ropsten Public Test Network. Contract Address will also be printed on the console.
+
+
+   +
+
 
+## Step 6
 
+In `index.ts`, comment the first function and uncomment the second one. Paste the address of the deployed contract from Step 5.
 
+```ts
+const contractAddress = "CONTRACT_ADDRESS";
+```
 
+Run the project again with `npm start` command. This time `getOwner` method on the contract will be called and address of the owner of the contract (the account you used to deploy the contract) will be printed in the console.
diff --git a/step26_web3_deploy_contract/tsconfig.json b/step26_web3_deploy_contract/tsconfig.json
index 07d2004..a24a581 100644
--- a/step26_web3_deploy_contract/tsconfig.json
+++ b/step26_web3_deploy_contract/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step26_web3_deploy_contract/tslint.json b/step26_web3_deploy_contract/tslint.json
index 24388b8..a64df52 100644
--- a/step26_web3_deploy_contract/tslint.json
+++ b/step26_web3_deploy_contract/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step26_web3_deploy_contract/yarn.lock b/step26_web3_deploy_contract/yarn.lock
deleted file mode 100644
index 7b89b82..0000000
--- a/step26_web3_deploy_contract/yarn.lock
+++ /dev/null
@@ -1,3632 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@babel/code-frame@^7.0.0":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.14.5.tgz#23b08d740e83f49c5e59945fbf1b43e80bbf4edb"
-  integrity sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==
-  dependencies:
-    "@babel/highlight" "^7.14.5"
-
-"@babel/helper-validator-identifier@^7.14.5":
-  version "7.14.9"
-  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz#6654d171b2024f6d8ee151bf2509699919131d48"
-  integrity sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==
-
-"@babel/highlight@^7.14.5":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.14.5.tgz#6861a52f03966405001f6aa534a01a24d99e8cd9"
-  integrity sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==
-  dependencies:
-    "@babel/helper-validator-identifier" "^7.14.5"
-    chalk "^2.0.0"
-    js-tokens "^4.0.0"
-
-"@ethereumjs/common@^2.3.0", "@ethereumjs/common@^2.4.0":
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/@ethereumjs/common/-/common-2.4.0.tgz#2d67f6e6ba22246c5c89104e6b9a119fb3039766"
-  integrity sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==
-  dependencies:
-    crc-32 "^1.2.0"
-    ethereumjs-util "^7.1.0"
-
-"@ethereumjs/tx@^3.2.1":
-  version "3.3.0"
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-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
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-
-yaeti@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
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-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/.env.example b/step27_web3_invoke_smartContract_with_signed_functions/.env.example
new file mode 100755
index 0000000..ffd94fb
--- /dev/null
+++ b/step27_web3_invoke_smartContract_with_signed_functions/.env.example
@@ -0,0 +1,5 @@
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
+ACCOUNT2_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_2_PUBLIC_ADDRESS
+
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+ACCOUNT2_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_2_PRIVATE_KEY
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/.gitignore b/step27_web3_invoke_smartContract_with_signed_functions/.gitignore
index 0e3a4c6..ec308a9 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/.gitignore
+++ b/step27_web3_invoke_smartContract_with_signed_functions/.gitignore
@@ -1,3 +1,8 @@
+# Node packages
 node_modules
+
+# Build files created by TypeScript Compiler
 *.js
-types
\ No newline at end of file
+
+# Environment Variables
+.env
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/SmartContract.ts b/step27_web3_invoke_smartContract_with_signed_functions/SmartContract.ts
new file mode 100644
index 0000000..6a06004
--- /dev/null
+++ b/step27_web3_invoke_smartContract_with_signed_functions/SmartContract.ts
@@ -0,0 +1,85 @@
+import Web3 from "web3";
+import EthContract from "web3-eth-contract";
+import { Transaction, TxData } from "ethereumjs-tx";
+
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class SmartContract {
+  protected web3: Web3;
+  protected contractAddress: string;
+  protected abi: string;
+  protected contract: EthContract.Contract;
+
+  /**
+   * Object representing a contract on Ethereum.
+   * @param contractAddress address of the contract on Ethereum network.
+   * @param abi ABI of the contract.
+   */
+  public constructor(contractAddress: string, abi: string) {
+    this.contractAddress = contractAddress;
+    this.abi = abi;
+    this.web3 = new Web3(RPC_ENDPOINT);
+    this.contract = new this.web3.eth.Contract(
+      JSON.parse(this.abi),
+      this.contractAddress
+    );
+  }
+
+  /**
+   * Get the public address of the contract on Ethereum network.
+   * @returns public address of the contract.
+   */
+  public getContractAddress(): string {
+    return this.contractAddress;
+  }
+
+  /**
+   * Get the public address of current owner of the smart contract.
+   * @returns public address of current owner of the smart contract.
+   */
+  getContractOwner = async () => {
+    return await this.contract.methods.getOwner().call();
+  };
+
+  /**
+   * Transfer the ownership of the smart contract to some other Ethereum account.
+   * @param newOwnerAddress public address of the new owner.
+   * @param previousOwnerPrivateKey privateKey of the previous owner.
+   * @param gasLimit maximumm amount of gas you want to allow for this transaction.
+   * @param gasPriceGwei gasPrice in Gwei you want to pay for this transaction.
+   * @returns transaction object for transferring the ownership.
+   */
+  changeContractOwner = async (
+    newOwnerAddress: string,
+    previousOwnerPrivateKey: string,
+    gasLimit: number,
+    gasPriceGwei: number
+  ) => {
+    const previousOwnerAddress = await this.getContractOwner();
+    // Build the transaction
+    const txCount = await this.web3.eth.getTransactionCount(
+      previousOwnerAddress
+    );
+    const txData: TxData = {
+      nonce: this.web3.utils.toHex(txCount),
+      to: this.contractAddress,
+      data: this.contract.methods.changeOwner(newOwnerAddress).encodeABI(),
+      gasLimit: this.web3.utils.toHex(gasLimit),
+      gasPrice: this.web3.utils.toHex(
+        this.web3.utils.toWei(gasPriceGwei.toString(), "gwei")
+      ),
+    };
+
+    // Sign the transaction
+    const tx = new Transaction(txData, { chain: "ropsten" });
+    tx.sign(Buffer.from(previousOwnerPrivateKey, "hex"));
+    const serializedTx = tx.serialize();
+    const rawTx = "0x" + serializedTx.toString("hex");
+
+    // Broadcast the transaction
+    return await this.web3.eth.sendSignedTransaction(rawTx);
+  };
+}
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/abi/contractABI.json b/step27_web3_invoke_smartContract_with_signed_functions/abi/contractABI.json
new file mode 100755
index 0000000..3a48176
--- /dev/null
+++ b/step27_web3_invoke_smartContract_with_signed_functions/abi/contractABI.json
@@ -0,0 +1,52 @@
+[
+  {
+    "inputs": [],
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "oldOwner",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "OwnerSet",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "changeOwner",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "getOwner",
+    "outputs": [
+      {
+        "internalType": "address",
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  }
+]
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/imgs/abi.png b/step27_web3_invoke_smartContract_with_signed_functions/imgs/abi.png
deleted file mode 100644
index b7700fc..0000000
Binary files a/step27_web3_invoke_smartContract_with_signed_functions/imgs/abi.png and /dev/null differ
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/index.ts b/step27_web3_invoke_smartContract_with_signed_functions/index.ts
index a088b51..6100fbd 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/index.ts
+++ b/step27_web3_invoke_smartContract_with_signed_functions/index.ts
@@ -1,16 +1,43 @@
-import { RunSmartContract } from './runSmartContract';
-
-const contract : RunSmartContract = new RunSmartContract();
-
-// we will use owner_sol smart contract for this example. It is one of the example contracts in remix IDE.
-
-
-// We have already added the contract ABI for 'owner_sol' smart contract in the variable below
-const contractAbi = [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerSet","type":"event"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"changeOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]
-
-
-//You may want to save your private key in an env file
-contract.changeOwnerFunction('CurrentOwnerPublicAddress','currentOwnerPrivateKey','smartContractAddress',1000000,10,contractAbi,'newOwnerPublicAddress').then(response => console.log(response))
-
-
-
+import dotenv from "dotenv";
+import { SmartContract } from "./SmartContract";
+import CONTRACT_ABI from "./abi/contractABI.json";
+
+// Create a file named ".env" and write the environment variables as mentioned in ".env.example"
+dotenv.config({ path: "./.env" });
+
+const contractAddress = "CONTRACT_ADDRESS";
+
+// Credentials of the previous owner
+const account1PrivateKey = process.env.ACCOUNT1_PRIVATE_KEY;
+// Credentials of the new owner
+const account2Address = process.env.ACCOUNT2_PUBLIC_ADDRESS;
+
+if (!account1PrivateKey || !account2Address) {
+  throw new Error(
+    "Account address of previous owner and private key of new owner must be provided as environment variables."
+  );
+}
+
+(async () => {
+  // Instantiate smart contract object.
+  const contract = new SmartContract(
+    contractAddress,
+    JSON.stringify(CONTRACT_ABI)
+  );
+
+  console.log("Previous Owner:", await contract.getContractOwner());
+
+  console.log("Changing Owner...");
+  const txData = await contract.changeContractOwner(
+    account2Address,
+    account1PrivateKey,
+    1_000_000,
+    10
+  );
+  console.log(
+    "EtherScan Link:",
+    `https://ropsten.etherscan.io/tx/${txData?.transactionHash}`
+  );
+
+  console.log("New Owner:", await contract.getContractOwner());
+})();
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/package-lock.json b/step27_web3_invoke_smartContract_with_signed_functions/package-lock.json
index 29aafaf..08364a7 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/package-lock.json
+++ b/step27_web3_invoke_smartContract_with_signed_functions/package-lock.json
@@ -1,8 +1,5544 @@
 {
-  "name": "step25",
+  "name": "step27",
   "version": "1.0.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "step27",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "ethereumjs-tx": "^2.1.2",
+        "web3": "^1.5.2"
+      },
+      "devDependencies": {
+        "@types/node": "^12.20.19",
+        "dotenv": "^10.0.0",
+        "nodemon": "^2.0.12",
+        "ts-node-dev": "^1.1.8",
+        "tslint": "^6.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.14.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
+      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@ethereumjs/common": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.4.0.tgz",
+      "integrity": "sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==",
+      "dependencies": {
+        "crc-32": "^1.2.0",
+        "ethereumjs-util": "^7.1.0"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/@types/bn.js": {
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+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@ethereumjs/common/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
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+        "create-hash": "^1.1.2",
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+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/@ethereumjs/tx": {
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+      }
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+      }
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+    },
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+        "ethereum-cryptography": "^0.1.3",
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+      },
+      "engines": {
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+      }
+    },
+    "node_modules/@ethersproject/abi": {
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+      "funding": [
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+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
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+          "url": "https://www.buymeacoffee.com/ricmoo"
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+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
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+    },
+    "node_modules/@ethersproject/address": {
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+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/keccak256": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/rlp": "^5.4.0"
+      }
+    },
+    "node_modules/@ethersproject/base64": {
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+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+          "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+          "requires": {
+            "@types/node": "*"
+          }
+        },
         "eth-lib": {
           "version": "0.2.8",
           "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.8.tgz",
@@ -4010,6 +9530,26 @@
             "xhr-request-promise": "^0.1.2"
           }
         },
+        "ethereumjs-util": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
+          "integrity": "sha512-kR+vhu++mUDARrsMMhsjjzPduRVAeundLGXucGRHF3B4oEltOUspfgCVco4kckucj3FMlLaZHUl9n7/kdmr6Tw==",
+          "requires": {
+            "@types/bn.js": "^5.1.0",
+            "bn.js": "^5.1.2",
+            "create-hash": "^1.1.2",
+            "ethereum-cryptography": "^0.1.3",
+            "ethjs-util": "0.1.6",
+            "rlp": "^2.2.4"
+          },
+          "dependencies": {
+            "bn.js": {
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+              "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+            }
+          }
+        },
         "uuid": {
           "version": "3.3.2",
           "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
@@ -4155,6 +9695,21 @@
         "typedarray-to-buffer": "^3.1.5",
         "utf-8-validate": "^5.0.2",
         "yaeti": "^0.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        }
       }
     },
     "which-boxed-primitive": {
@@ -4170,16 +9725,16 @@
       }
     },
     "which-typed-array": {
-      "version": "1.1.6",
-      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.6.tgz",
-      "integrity": "sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==",
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.7.tgz",
+      "integrity": "sha512-vjxaB4nfDqwKI0ws7wZpxIlde1XrLX5uB0ZjpfshgmapJMD7jJWhZI+yToJTqaFByF0eNBcYxbjmCzoRP7CfEw==",
       "requires": {
-        "available-typed-arrays": "^1.0.4",
+        "available-typed-arrays": "^1.0.5",
         "call-bind": "^1.0.2",
         "es-abstract": "^1.18.5",
         "foreach": "^2.0.5",
         "has-tostringtag": "^1.0.0",
-        "is-typed-array": "^1.1.6"
+        "is-typed-array": "^1.1.7"
       }
     },
     "widest-line": {
@@ -4216,6 +9771,13 @@
         "async-limiter": "~1.0.0",
         "safe-buffer": "~5.1.0",
         "ultron": "~1.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
       }
     },
     "xdg-basedir": {
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/package.json b/step27_web3_invoke_smartContract_with_signed_functions/package.json
index 419f77f..ff35fd1 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/package.json
+++ b/step27_web3_invoke_smartContract_with_signed_functions/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
@@ -15,6 +15,7 @@
   },
   "devDependencies": {
     "@types/node": "^12.20.19",
+    "dotenv": "^10.0.0",
     "nodemon": "^2.0.12",
     "ts-node-dev": "^1.1.8",
     "tslint": "^6.1.3"
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/readme.md b/step27_web3_invoke_smartContract_with_signed_functions/readme.md
index 3e968c5..34b1066 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/readme.md
+++ b/step27_web3_invoke_smartContract_with_signed_functions/readme.md
@@ -1,21 +1,50 @@
-# Invoke Smart Contract Functions with Signed Transaction
+# Step 27: Invoke Smart Contract Functions with Signed Transaction
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=6HlHwCaAZKQ&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=5)
+## References:
 
-Uptill now in all the previous steps we have interacted with our deployed smart contracts using the folliowing code. 
-Note that we are not signing any request or transaction in the code below and therefore it can only be used to invoke functions that can be run by anyone and does not need any authentication. 
+1.  We will follow this [video tutorial](https://www.youtube.com/watch?v=6HlHwCaAZKQ&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=5) in this step.
 
-Functions that could only be invoked by certain users could not be invoked by the following code. Such functions need to be invoked by a signed transaction.
+## Step 1
 
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
+
+Add `ethereumjs-tx` for signing the transactions and `dotenv` for working with environment variables.
+
+```bash
+npm i ethereumjs-tx
+npm i -D dotenv
 ```
-    const contract = new this.web3.eth.Contract(contractAbi, contractAddress);
-    await contract.methods.name.call()
+
+## Step 2
+
+In [Step 25](../step25_web3_send_transaction_signed) and [Step 26](../step26_web3_deploy_contract), you created a MetaMask wallet. We will use the same accounts in this step. Make sure that your account has some fake ETH for Ropsten Public Test Network.
+
+## Step 3
+
+Create a `.env` file and save some environment variables in it in the format given in `.env.example`. In this step, we need only need account 1 (previous owner) private key and account 2 (new owner) public key.
+
 ```
+ACCOUNT1_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_1_PUBLIC_ADDRESS
+ACCOUNT2_PUBLIC_ADDRESS = REPLACE_WITH_YOUR_ACCOUNT_2_PUBLIC_ADDRESS
 
+ACCOUNT1_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_1_PRIVATE_KEY
+ACCOUNT2_PRIVATE_KEY = REPLACE_WITH_YOUR_ACCOUNT_2_PRIVATE_KEY
+```
 
-In this step we will use the 'owner.sol' example smart contract which is provided in remix IDE. If you cannot find this example in remix IDE you can copy paste the code below. 
+## Step 4:
 
+We will interact with the same smart contract as in [Step 26](../step26_web3_deploy_contract). So, copy its ABI file from there and place it in `abi` directory.
+
+Until now, in all the previous steps, we have interacted with smart contracts using the methods that don't require a signed transaction (as shown below).
+
+```ts
+const contract = new this.web3.eth.Contract(contractAddress, contractAbi);
+await contract.methods.name.call();
 ```
+
+Note: The smart contract given below has two methods: `getOwner` and `changeOwner`. We will call the method `changeOwner` in this step that can only be called by the current owner of the contract. In order to verify that the caller of the method is the owner of the contract, the transaction calling the method must be signed by the caller.
+
+```sol
 // SPDX-License-Identifier: GPL-3.0
 
 pragma solidity >=0.7.0 <0.9.0;
@@ -25,87 +54,77 @@ pragma solidity >=0.7.0 <0.9.0;
  * @dev Set & change owner
  */
 contract Owner {
-
-    address private owner;
-    
-    // event for EVM logging
-    event OwnerSet(address indexed oldOwner, address indexed newOwner);
-    
-    // modifier to check if caller is owner
-    modifier isOwner() {
-        // If the first argument of 'require' evaluates to 'false', execution terminates and all
-        // changes to the state and to Ether balances are reverted.
-        // This used to consume all gas in old EVM versions, but not anymore.
-        // It is often a good idea to use 'require' to check if functions are called correctly.
-        // As a second argument, you can also provide an explanation about what went wrong.
-        require(msg.sender == owner, "Caller is not owner");
-        _;
-    }
-    
-    /**
-     * @dev Set contract deployer as owner
-     */
-    constructor() {
-        owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
-        emit OwnerSet(address(0), owner);
-    }
-
-    /**
-     * @dev Change owner
-     * @param newOwner address of new owner
-     */
-    function changeOwner(address newOwner) public isOwner {
-        emit OwnerSet(owner, newOwner);
-        owner = newOwner;
-    }
-
-    /**
-     * @dev Return owner address 
-     * @return address of owner
-     */
-    function getOwner() external view returns (address) {
-        return owner;
-    }
+  address private owner;
+
+  // event for EVM logging
+  event OwnerSet(address indexed oldOwner, address indexed newOwner);
+
+  // modifier to check if caller is owner
+  modifier isOwner() {
+    require(msg.sender == owner, "Caller is not owner");
+    _;
+  }
+
+  /**
+   * @dev Set contract deployer as owner
+   */
+  constructor() {
+    owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
+    emit OwnerSet(address(0), owner);
+  }
+
+  /**
+   * @dev Change owner
+   * @param newOwner address of new owner
+   */
+  function changeOwner(address newOwner) public isOwner {
+    emit OwnerSet(owner, newOwner);
+    owner = newOwner;
+  }
+
+  /**
+   * @dev Return owner address
+   * @return address of owner
+   */
+  function getOwner() external view returns (address) {
+    return owner;
+  }
 }
 ```
 
+## Step 5
 
-Note: There are two functions in this smart contract 
-
-1) getOwner(): This function can be invoked by anyone and therefore it does not need a signed transaction to be invoked
-2) changeOwner(): This function can only be invoked by the current owner of the smart contract (we have added a condition using modifier) and therefore the invocation of this function needs to be signed.
-
+Create `SmartContract.ts` and `index.ts` files. In `SmartContract.ts` file, there is a method `changeContractOwner`. It creates and signes the transaction using previous owner's private key, and sends the new owner's pulic address as a parameter.
 
-## step 1:
+In `SmartContract.ts`, replace INFURA_PROJECT_ID with your Infura project ID.
 
-compile the 'owner.sol' smart contract on remix IDE and then deploy it on ropsten network as we did in step 26.
-
-## step 2:
-
-get the ABI of contract from remix IDE as shown below and also get the smart contract address from ropsten ether scan. You will need these two things to run the code in this example.
-
->
-
-
-
-This step runs the 'changeOwner()' function of the smart contract through a signed invocation of the smart contract.
+```ts
+// Ropsten Test Network endpoint.
+const network = "ropsten";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
 
+In `index.ts`, paste the address of the deployed contract from [Step 26](../step26_web3_deploy_contract).
 
+```ts
+const contractAddress = "CONTRACT_ADDRESS";
+```
 
-You can create accounts using metamask for this step and load it with test ethers from a ropston faucet like https://faucet.ropsten.be/
+## Step 5
 
-You will see in the code that here we have explicitly signed our transaction using the private key. This is how you should go about sending transactions in a public block chain where the nodes cannot be trusted with your private keys.
+Run the project with the following command:
 
+```bash
 npm link typescript
-
 npm start
+```
 
-or
+or with these commands.
 
+```bash
 tsc
-
 node index
+```
 
-
-
-
+In the console, a link to [ropsten.etherscan.io](https://ropsten.etherscan.io/) will be printed. You can see that this transaction that changed the smart contract owner is now a part of Ropsten Public Test Network. Previous and new owner addresses will also be printed on the console.
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/runSmartContract.ts b/step27_web3_invoke_smartContract_with_signed_functions/runSmartContract.ts
deleted file mode 100644
index b220678..0000000
--- a/step27_web3_invoke_smartContract_with_signed_functions/runSmartContract.ts
+++ /dev/null
@@ -1,63 +0,0 @@
-import Web3 from 'web3';
-import { Transaction } from 'ethereumjs-tx'
-
-
-export class RunSmartContract {
-  private web3: Web3
-
-  public constructor() {
-
-    // use ropsten endpoint here (dont use main because we are just sending ethers for testing)
-    this.web3 = new Web3("your_ropsten_endpoint");
-  }
-
-
-  public async changeOwnerFunction(publicAddress: string, PrivateKey: string, contractAddress: string, gasLimit: number, gasPriceGwei: number, contractAbi: any, newOwner: string) {
-
-    // we are getting the last transaction number for nonce
-    const senderTransactionCount = await this.web3.eth.getTransactionCount(publicAddress)
-
-
-    // get contract reference
-    const contract = new this.web3.eth.Contract(contractAbi, contractAddress);
-
-
-    // everything needs to be in hex
-    const txObject = {
-      nonce: this.web3.utils.toHex(senderTransactionCount),
-      gasLimit: this.web3.utils.toHex(gasLimit),
-      gasPrice: this.web3.utils.toHex(this.web3.utils.toWei(gasPriceGwei.toString(), 'gwei')),
-      data: contract.methods.changeOwner(newOwner).encodeABI(), // ABI encoded function that you need to run
-      to: contractAddress // transaction to your deployed contract
-    }
-
-    //-----------------sign the transaction
-
-    const tx = new Transaction(txObject, { chain: 'ropsten' })
-    tx.sign(Buffer.from(PrivateKey, 'hex'))
-    const serializeTx = tx.serialize()
-    const rawTx = '0x' + serializeTx.toString('hex')
-
-    //------------------broadcast the transaction 
-
-    const prevOwner = await contract.methods.getOwner().call()
-
-    console.log('prevOwner', prevOwner)
-
-    const txSent = await this.web3.eth.sendSignedTransaction(rawTx)
-
-    const getOwner = await contract.methods.getOwner().call()
-
-    console.log('newOwner', getOwner)
-
-    return txSent
-
-  }
-
-
-
-
-
-
-}
-
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/tsconfig.json b/step27_web3_invoke_smartContract_with_signed_functions/tsconfig.json
index 07d2004..a24a581 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/tsconfig.json
+++ b/step27_web3_invoke_smartContract_with_signed_functions/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/tslint.json b/step27_web3_invoke_smartContract_with_signed_functions/tslint.json
index 24388b8..a64df52 100644
--- a/step27_web3_invoke_smartContract_with_signed_functions/tslint.json
+++ b/step27_web3_invoke_smartContract_with_signed_functions/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step27_web3_invoke_smartContract_with_signed_functions/yarn.lock b/step27_web3_invoke_smartContract_with_signed_functions/yarn.lock
deleted file mode 100644
index 7b89b82..0000000
--- a/step27_web3_invoke_smartContract_with_signed_functions/yarn.lock
+++ /dev/null
@@ -1,3632 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@babel/code-frame@^7.0.0":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.14.5.tgz#23b08d740e83f49c5e59945fbf1b43e80bbf4edb"
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-  dependencies:
-    "@babel/highlight" "^7.14.5"
-
-"@babel/helper-validator-identifier@^7.14.5":
-  version "7.14.9"
-  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz#6654d171b2024f6d8ee151bf2509699919131d48"
-  integrity sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==
-
-"@babel/highlight@^7.14.5":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.14.5.tgz#6861a52f03966405001f6aa534a01a24d99e8cd9"
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-  dependencies:
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-    chalk "^2.0.0"
-    js-tokens "^4.0.0"
-
-"@ethereumjs/common@^2.3.0", "@ethereumjs/common@^2.4.0":
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/@ethereumjs/common/-/common-2.4.0.tgz#2d67f6e6ba22246c5c89104e6b9a119fb3039766"
-  integrity sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==
-  dependencies:
-    crc-32 "^1.2.0"
-    ethereumjs-util "^7.1.0"
-
-"@ethereumjs/tx@^3.2.1":
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/@ethereumjs/tx/-/tx-3.3.0.tgz#14ed1b7fa0f28e1cd61e3ecbdab824205f6a4378"
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-  dependencies:
-    "@ethereumjs/common" "^2.4.0"
-    ethereumjs-util "^7.1.0"
-
-"@ethersproject/abi@5.0.7":
-  version "5.0.7"
-  resolved "https://registry.yarnpkg.com/@ethersproject/abi/-/abi-5.0.7.tgz#79e52452bd3ca2956d0e1c964207a58ad1a0ee7b"
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-  dependencies:
-    "@ethersproject/address" "^5.0.4"
-    "@ethersproject/bignumber" "^5.0.7"
-    "@ethersproject/bytes" "^5.0.4"
-    "@ethersproject/constants" "^5.0.4"
-    "@ethersproject/hash" "^5.0.4"
-    "@ethersproject/keccak256" "^5.0.3"
-    "@ethersproject/logger" "^5.0.5"
-    "@ethersproject/properties" "^5.0.3"
-    "@ethersproject/strings" "^5.0.4"
-
-"@ethersproject/abstract-provider@^5.4.0":
-  version "5.4.1"
-  resolved "https://registry.yarnpkg.com/@ethersproject/abstract-provider/-/abstract-provider-5.4.1.tgz#e404309a29f771bd4d28dbafadcaa184668c2a6e"
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-  dependencies:
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-    "@ethersproject/bytes" "^5.4.0"
-    "@ethersproject/logger" "^5.4.0"
-    "@ethersproject/networks" "^5.4.0"
-    "@ethersproject/properties" "^5.4.0"
-    "@ethersproject/transactions" "^5.4.0"
-    "@ethersproject/web" "^5.4.0"
-
-"@ethersproject/abstract-signer@^5.4.0":
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-  version "1.0.1"
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-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
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-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
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-  version "0.11.10"
-  resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
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-  resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.7.tgz#f19fe69ceab311eeb94b42e70e8c2070f9ba1025"
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-  version "1.8.0"
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-  resolved "https://registry.yarnpkg.com/pstree.remy/-/pstree.remy-1.1.8.tgz#c242224f4a67c21f686839bbdb4ac282b8373d3a"
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-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/public-encrypt/-/public-encrypt-4.0.3.tgz#4fcc9d77a07e48ba7527e7cbe0de33d0701331e0"
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-  version "3.0.0"
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.0.tgz#5f863edc89b96db09074bad7947bf09056ca4e7d"
-  integrity sha1-X4Y+3Im5bbCQdLrXlHvwkFbKTn0=
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-  resolved "https://registry.yarnpkg.com/pupa/-/pupa-2.1.1.tgz#f5e8fd4afc2c5d97828faa523549ed8744a20d62"
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-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.7.0.tgz#41dc1a015e3d581f1621776be31afb2876a9b1bc"
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-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step28_web3_fetch_events/.gitignore b/step28_web3_fetch_events/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step28_web3_fetch_events/.gitignore
+++ b/step28_web3_fetch_events/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step28_web3_fetch_events/SmartContract.ts b/step28_web3_fetch_events/SmartContract.ts
new file mode 100755
index 0000000..4225ca7
--- /dev/null
+++ b/step28_web3_fetch_events/SmartContract.ts
@@ -0,0 +1,65 @@
+import Web3 from "web3";
+import EthContract from "web3-eth-contract";
+
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class SmartContract {
+  protected web3: Web3;
+  protected contractAddress: string;
+  protected abi: string;
+  protected contract: EthContract.Contract;
+
+  /**
+   * Object representing a contract on Ethereum.
+   * @param contractAddress address of the contract on Ethereum network.
+   * @param abi ABI of the contract.
+   */
+  public constructor(contractAddress: string, abi: string) {
+    this.contractAddress = contractAddress;
+    this.abi = abi;
+    this.web3 = new Web3(RPC_ENDPOINT);
+    this.contract = new this.web3.eth.Contract(
+      JSON.parse(this.abi),
+      this.contractAddress
+    );
+  }
+
+  /**
+   * Get the public address of the contract on Ethereum network.
+   * @returns public address of the contract.
+   */
+  public getContractAddress = () => this.contractAddress;
+
+  /**
+   * Get events of a specific type within a range of blocks of Ethereum.
+   * @param params parameters for configuring the function.
+   * @returns
+   */
+  getEvents = async (params: GetEventsParams) => {
+    const fromBlock = params.fromBlock;
+    const toBlock = params.toBlock ?? "latest";
+    const eventType = params.eventType ?? "AllEvents";
+
+    return await this.contract.getPastEvents(eventType, {
+      fromBlock,
+      toBlock,
+    });
+  };
+}
+
+type GetEventsParams = {
+  /**
+   * starting block number.
+   */
+  fromBlock: number | string;
+  /**
+   * (Optional) ending block number. Default is `latest`.
+   */
+  toBlock?: number | string;
+  /**
+   * (Optional) type of the events you want to fetch. Default is `AllEvents`.
+   */
+  eventType?: string;
+};
diff --git a/step28_web3_fetch_events/abi/dai.json b/step28_web3_fetch_events/abi/dai.json
new file mode 100755
index 0000000..17056ff
--- /dev/null
+++ b/step28_web3_fetch_events/abi/dai.json
@@ -0,0 +1,333 @@
+[
+  {
+    "inputs": [
+      { "internalType": "uint256", "name": "chainId_", "type": "uint256" }
+    ],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "guy",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Approval",
+    "type": "event"
+  },
+  {
+    "anonymous": true,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "bytes4",
+        "name": "sig",
+        "type": "bytes4"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "usr",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg1",
+        "type": "bytes32"
+      },
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "arg2",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes",
+        "name": "data",
+        "type": "bytes"
+      }
+    ],
+    "name": "LogNote",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "src",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "dst",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "wad",
+        "type": "uint256"
+      }
+    ],
+    "name": "Transfer",
+    "type": "event"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "DOMAIN_SEPARATOR",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "PERMIT_TYPEHASH",
+    "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      { "internalType": "address", "name": "", "type": "address" },
+      { "internalType": "address", "name": "", "type": "address" }
+    ],
+    "name": "allowance",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "approve",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "balanceOf",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "burn",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "decimals",
+    "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "deny",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "mint",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "move",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "name",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "nonces",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "holder", "type": "address" },
+      { "internalType": "address", "name": "spender", "type": "address" },
+      { "internalType": "uint256", "name": "nonce", "type": "uint256" },
+      { "internalType": "uint256", "name": "expiry", "type": "uint256" },
+      { "internalType": "bool", "name": "allowed", "type": "bool" },
+      { "internalType": "uint8", "name": "v", "type": "uint8" },
+      { "internalType": "bytes32", "name": "r", "type": "bytes32" },
+      { "internalType": "bytes32", "name": "s", "type": "bytes32" }
+    ],
+    "name": "permit",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "pull",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "usr", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "push",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [{ "internalType": "address", "name": "guy", "type": "address" }],
+    "name": "rely",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "symbol",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "totalSupply",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transfer",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      { "internalType": "address", "name": "src", "type": "address" },
+      { "internalType": "address", "name": "dst", "type": "address" },
+      { "internalType": "uint256", "name": "wad", "type": "uint256" }
+    ],
+    "name": "transferFrom",
+    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "version",
+    "outputs": [{ "internalType": "string", "name": "", "type": "string" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [{ "internalType": "address", "name": "", "type": "address" }],
+    "name": "wards",
+    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  }
+]
diff --git a/step28_web3_fetch_events/getEventsDai.ts b/step28_web3_fetch_events/getEventsDai.ts
deleted file mode 100644
index 673ba3b..0000000
--- a/step28_web3_fetch_events/getEventsDai.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-import Web3 from 'web3';
-
-
-export class GetEventsDai {
-  private web3: Web3
-  private daiAddress: string
-  private daiABI: any
-
-
-  public constructor() {
-
-    // use mainnet endpoint here 
-    this.web3 = new Web3("YOUR_Mainnet_RPC_ENDPOINT");
-
-    // dai contract address
-    this.daiAddress = "0x6b175474e89094c44da98b954eedeac495271d0f";
-
-    // dai ABI
-    this.daiABI = [{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"guy","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"dst","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"move","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"holder","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"bool","name":"allowed","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"pull","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"push","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]
-  }
-
-
-  public async getEvents() {
-
-    // get contract reference
-    const contract = new this.web3.eth.Contract(this.daiABI, this.daiAddress);
-
-    // right now we are fetching all events. You can also fetch a particular type of event like for example incase of 
-    //erc20 tokens 'transfer' event
-
-    // we are fetching events from block 13081417 to the latest block of DAI.
-    const events = await contract.getPastEvents('AllEvents',{fromBlock:13081417,toBlock:'latest'})
-
-    //logging the events
-    console.log(events)
-
-
-  }
-
-
-
-
-
-
-}
-
diff --git a/step28_web3_fetch_events/index.ts b/step28_web3_fetch_events/index.ts
index ab3bdc0..bdbad6e 100644
--- a/step28_web3_fetch_events/index.ts
+++ b/step28_web3_fetch_events/index.ts
@@ -1,8 +1,32 @@
-import { GetEventsDai } from './getEventsDai';
+import { SmartContract } from "./SmartContract";
+import DAI_ABI from "./abi/dai.json";
 
-const contract : GetEventsDai = new GetEventsDai();
+const DAI_ADDRESS = "0x6B175474E89094C44Da98b954EedeAC495271d0F";
 
-contract.getEvents().then((res)=>console.log(res))
+(async () => {
+  // Instantiate smart contract object.
+  const contract = new SmartContract(DAI_ADDRESS, JSON.stringify(DAI_ABI));
 
+  // If the difference between `fromBlock` and `toBlock` is too large,
+  // your console may overwhelm with events.
+  const fromBlock = 13134800;
+  const toBlock = 13134820;
 
+  // #1 All Events
+  const allEvents = await contract.getEvents({
+    fromBlock,
+    toBlock,
+  });
+  console.log("All Events Count:", allEvents.length);
 
+  // #2 Transfer Events Only
+  const transferEvents = await contract.getEvents({
+    fromBlock,
+    toBlock,
+    eventType: "Transfer",
+  });
+  console.log("Transfer Events Count:", transferEvents.length);
+
+  // #3 Latest Event generated by DAI's contract.
+  console.log("Latest Event:", allEvents.pop());
+})();
diff --git a/step28_web3_fetch_events/package-lock.json b/step28_web3_fetch_events/package-lock.json
new file mode 100644
index 0000000..b4c0110
--- /dev/null
+++ b/step28_web3_fetch_events/package-lock.json
@@ -0,0 +1,9715 @@
+{
+  "name": "step28",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "step28",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "web3": "^1.5.2"
+      },
+      "devDependencies": {
+        "@types/node": "^12.20.19",
+        "nodemon": "^2.0.12",
+        "ts-node-dev": "^1.1.8",
+        "tslint": "^6.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
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diff --git a/step28_web3_fetch_events/package.json b/step28_web3_fetch_events/package.json
index b729bfa..9c52d4c 100644
--- a/step28_web3_fetch_events/package.json
+++ b/step28_web3_fetch_events/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
diff --git a/step28_web3_fetch_events/readme.md b/step28_web3_fetch_events/readme.md
index 54628d8..058ade1 100644
--- a/step28_web3_fetch_events/readme.md
+++ b/step28_web3_fetch_events/readme.md
@@ -1,27 +1,42 @@
-# Reading events from Smart Contracts
+# Step 28: Reading events from Smart Contracts
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=CX2QOE0FcEo&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=6)
+## References:
 
-In this example we will learn how to read events generated by smart contracts.
+1.  We will follow this [video tutorial](https://www.youtube.com/watch?v=CX2QOE0FcEo&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=6) in this step.
 
-We are reading events from DAI token. 
+In this example we will learn how to read events generated by smart contracts. We will read events from DAI token.
 
+## Step 1
 
-As you can see in the code below we are reading events from block number 13081417 to the latest block. You may want to change the values of these block depending on when you run this code so that you dont get over flooded with events
-```
-    const events = await contract.getPastEvents('AllEvents',{fromBlock:13081417,toBlock:'latest'})
-```
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-npm link typescript
+## Step 2
 
-npm start
+Go to [Dai Smart Contract](https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code) on EtherScan. Copy Dai's ABI and contract address. Save the ABI in `abi/dai.json`. On the same page, under the [_events_](https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#events) tab, you can see all the latest events generated by Dai's contract. We will fetch these events to our app in the steps to follow.
 
-or
+## Step 3
 
-tsc
+Create `SmartContract.ts` and `index.ts` files. In `SmartContract.ts` file, replace INFURA_PROJECT_ID with your Infura project ID.
 
-node index
+```ts
+// Ropsten Test Network endpoint.
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
 
+## Step 4
 
+Run the project with the following command:
 
+```bash
+npm link typescript
+npm start
+```
+
+or with these commands.
 
+```bash
+tsc
+node index
+```
diff --git a/step28_web3_fetch_events/tsconfig.json b/step28_web3_fetch_events/tsconfig.json
index 07d2004..a24a581 100644
--- a/step28_web3_fetch_events/tsconfig.json
+++ b/step28_web3_fetch_events/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step28_web3_fetch_events/tslint.json b/step28_web3_fetch_events/tslint.json
index 24388b8..a64df52 100644
--- a/step28_web3_fetch_events/tslint.json
+++ b/step28_web3_fetch_events/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step28_web3_fetch_events/yarn.lock b/step28_web3_fetch_events/yarn.lock
deleted file mode 100644
index 573e692..0000000
--- a/step28_web3_fetch_events/yarn.lock
+++ /dev/null
@@ -1,3606 +0,0 @@
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-  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
-  integrity sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=
-
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-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.1.2.tgz#dd822aa0887580e52f1a039dc3eda108efae3075"
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-    create-hmac "^1.1.4"
-    ripemd160 "^2.0.1"
-    safe-buffer "^5.0.1"
-    sha.js "^2.4.8"
-
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
-  integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
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-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.0.tgz#f1f061de8f6a4bf022892e2d128234fb98302972"
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-
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
-  integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
-  integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/printj/-/printj-1.1.2.tgz#d90deb2975a8b9f600fb3a1c94e3f4c53c78a222"
-  integrity sha512-zA2SmoLaxZyArQTOPj5LXecR+RagfPSU5Kw1qP+jkWeNlrq+eJZyY2oS68SU1Z/7/myXM4lo9716laOFAVStCQ==
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-  version "0.11.10"
-  resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
-  integrity sha1-czIwDoQBYb2j5podHZGn1LwW8YI=
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-  version "2.0.7"
-  resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.7.tgz#f19fe69ceab311eeb94b42e70e8c2070f9ba1025"
-  integrity sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==
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-    ipaddr.js "1.9.1"
-
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-  version "1.8.0"
-  resolved "https://registry.yarnpkg.com/psl/-/psl-1.8.0.tgz#9326f8bcfb013adcc005fdff056acce020e51c24"
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-  version "1.1.8"
-  resolved "https://registry.yarnpkg.com/pstree.remy/-/pstree.remy-1.1.8.tgz#c242224f4a67c21f686839bbdb4ac282b8373d3a"
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-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/public-encrypt/-/public-encrypt-4.0.3.tgz#4fcc9d77a07e48ba7527e7cbe0de33d0701331e0"
-  integrity sha512-zVpa8oKZSz5bTMTFClc1fQOnyyEzpl5ozpi1B5YcvBrdohMjH2rfsBtyXcuNuwjsDIXmBYlF2N5FlJYhR29t8Q==
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-    browserify-rsa "^4.0.0"
-    create-hash "^1.1.0"
-    parse-asn1 "^5.0.0"
-    randombytes "^2.0.1"
-    safe-buffer "^5.1.2"
-
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-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/pump/-/pump-3.0.0.tgz#b4a2116815bde2f4e1ea602354e8c75565107a64"
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-  dependencies:
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-    once "^1.3.1"
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.0.tgz#5f863edc89b96db09074bad7947bf09056ca4e7d"
-  integrity sha1-X4Y+3Im5bbCQdLrXlHvwkFbKTn0=
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-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
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-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/pupa/-/pupa-2.1.1.tgz#f5e8fd4afc2c5d97828faa523549ed8744a20d62"
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-  dependencies:
-    escape-goat "^2.0.0"
-
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-  version "6.7.0"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.7.0.tgz#41dc1a015e3d581f1621776be31afb2876a9b1bc"
-  integrity sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==
-
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-  version "6.5.2"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
-  integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
-
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-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/query-string/-/query-string-5.1.1.tgz#a78c012b71c17e05f2e3fa2319dd330682efb3cb"
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-    object-assign "^4.1.0"
-    strict-uri-encode "^1.0.0"
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/randomfill/-/randomfill-1.0.4.tgz#c92196fc86ab42be983f1bf31778224931d61458"
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-    safe-buffer "^5.1.0"
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-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.1.tgz#3cf37023d199e1c24d1a55b84800c2f3e6468031"
-  integrity sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==
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-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.4.0.tgz#a1ce6fb9c9bc356ca52e89256ab59059e13d0332"
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-    http-errors "1.7.2"
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-    unpipe "1.0.0"
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-  version "1.2.8"
-  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
-  integrity sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==
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-    ini "~1.3.0"
-    minimist "^1.2.0"
-    strip-json-comments "~2.0.1"
-
-readable-stream@^3.6.0:
-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
-  integrity sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
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-    string_decoder "^1.1.1"
-    util-deprecate "^1.0.1"
-
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-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.6.0.tgz#74a370bd857116e245b29cc97340cd431a02a6c7"
-  integrity sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==
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-
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-  version "4.2.1"
-  resolved "https://registry.yarnpkg.com/registry-auth-token/-/registry-auth-token-4.2.1.tgz#6d7b4006441918972ccd5fedcd41dc322c79b250"
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-  dependencies:
-    rc "^1.2.8"
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-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/registry-url/-/registry-url-5.1.0.tgz#e98334b50d5434b81136b44ec638d9c2009c5009"
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-  dependencies:
-    rc "^1.2.8"
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-  version "2.88.2"
-  resolved "https://registry.yarnpkg.com/request/-/request-2.88.2.tgz#d73c918731cb5a87da047e207234146f664d12b3"
-  integrity sha512-MsvtOrfG9ZcrOwAW+Qi+F6HbD0CWXEh9ou77uOb7FM2WPhwT7smM833PzanhJLsgXjN89Ir6V2PczXNnMpwKhw==
-  dependencies:
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-    aws4 "^1.8.0"
-    caseless "~0.12.0"
-    combined-stream "~1.0.6"
-    extend "~3.0.2"
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-    har-validator "~5.1.3"
-    http-signature "~1.2.0"
-    is-typedarray "~1.0.0"
-    isstream "~0.1.2"
-    json-stringify-safe "~5.0.1"
-    mime-types "~2.1.19"
-    oauth-sign "~0.9.0"
-    performance-now "^2.1.0"
-    qs "~6.5.2"
-    safe-buffer "^5.1.2"
-    tough-cookie "~2.5.0"
-    tunnel-agent "^0.6.0"
-    uuid "^3.3.2"
-
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-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.20.0.tgz#629a013fb3f70755d6f0b7935cc1c2c5378b1975"
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-    path-parse "^1.0.6"
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/responselike/-/responselike-1.0.2.tgz#918720ef3b631c5642be068f15ade5a46f4ba1e7"
-  integrity sha1-kYcg7ztjHFZCvgaPFa3lpG9Loec=
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-    lowercase-keys "^1.0.0"
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-  version "2.7.1"
-  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
-  integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
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-
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-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/ripemd160/-/ripemd160-2.0.2.tgz#a1c1a6f624751577ba5d07914cbc92850585890c"
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-    inherits "^2.0.1"
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-  version "2.2.6"
-  resolved "https://registry.yarnpkg.com/rlp/-/rlp-2.2.6.tgz#c80ba6266ac7a483ef1e69e8e2f056656de2fb2c"
-  integrity sha512-HAfAmL6SDYNWPUOJNrM500x4Thn4PZsEy5pijPh40U9WfNk0z15hUYzO9xVIMAdIHdFtD8CBDHd75Td1g36Mjg==
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-    bn.js "^4.11.1"
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-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
-  integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
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-  version "5.2.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
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-  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
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-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-3.0.1.tgz#d314a57c2aef69d1ad98a138a21fe9eafa9ee312"
-  integrity sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA==
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-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/secp256k1/-/secp256k1-4.0.2.tgz#15dd57d0f0b9fdb54ac1fa1694f40e5e9a54f4a1"
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-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/semver-diff/-/semver-diff-3.1.1.tgz#05f77ce59f325e00e2706afd67bb506ddb1ca32b"
-  integrity sha512-GX0Ix/CJcHyB8c4ykpHGIAvLyOwOobtM/8d+TQkAd81/bEjgPHrfba41Vpesr7jX/t8Uh+R3EX9eAS5be+jQYg==
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-  version "5.7.1"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
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-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
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-  version "0.17.1"
-  resolved "https://registry.yarnpkg.com/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"
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-    web3-core-method "1.5.2"
-    web3-net "1.5.2"
-    web3-utils "1.5.2"
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-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-eth/-/web3-eth-1.5.2.tgz#0f6470df60a2a7d04df4423ca7721db8ed5ad72b"
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-  dependencies:
-    oboe "2.1.5"
-    web3-core-helpers "1.5.2"
-
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-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-providers-ws/-/web3-providers-ws-1.5.2.tgz#d336a93ed608b40cdcadfadd1f1bc8d32ea046e0"
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-  dependencies:
-    eventemitter3 "4.0.4"
-    web3-core-helpers "1.5.2"
-    websocket "^1.0.32"
-
-web3-shh@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-shh/-/web3-shh-1.5.2.tgz#a72a3d903c0708a004db94a72d934a302d880aea"
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-  dependencies:
-    web3-core "1.5.2"
-    web3-core-method "1.5.2"
-    web3-core-subscriptions "1.5.2"
-    web3-net "1.5.2"
-
-web3-utils@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-utils/-/web3-utils-1.5.2.tgz#150982dcb1918ffc54eba87528e28f009ebc03aa"
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-  dependencies:
-    bn.js "^4.11.9"
-    eth-lib "0.2.8"
-    ethereum-bloom-filters "^1.0.6"
-    ethjs-unit "0.1.6"
-    number-to-bn "1.7.0"
-    randombytes "^2.1.0"
-    utf8 "3.0.0"
-
-web3@^1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3/-/web3-1.5.2.tgz#736ca2f39048c63964203dd811f519400973e78d"
-  integrity sha512-aapKLdO8t7Cos6tZLeeQUtCJvTiPMlLcHsHHDLSBZ/VaJEucSTxzun32M8sp3BmF4waDEmhY+iyUM1BKvtAcVQ==
-  dependencies:
-    web3-bzz "1.5.2"
-    web3-core "1.5.2"
-    web3-eth "1.5.2"
-    web3-eth-personal "1.5.2"
-    web3-net "1.5.2"
-    web3-shh "1.5.2"
-    web3-utils "1.5.2"
-
-websocket@^1.0.32:
-  version "1.0.34"
-  resolved "https://registry.yarnpkg.com/websocket/-/websocket-1.0.34.tgz#2bdc2602c08bf2c82253b730655c0ef7dcab3111"
-  integrity sha512-PRDso2sGwF6kM75QykIesBijKSVceR6jL2G8NGYyq2XrItNC2P5/qL5XeR056GhA+Ly7JMFvJb9I312mJfmqnQ==
-  dependencies:
-    bufferutil "^4.0.1"
-    debug "^2.2.0"
-    es5-ext "^0.10.50"
-    typedarray-to-buffer "^3.1.5"
-    utf-8-validate "^5.0.2"
-    yaeti "^0.0.6"
-
-which-boxed-primitive@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"
-  integrity sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==
-  dependencies:
-    is-bigint "^1.0.1"
-    is-boolean-object "^1.1.0"
-    is-number-object "^1.0.4"
-    is-string "^1.0.5"
-    is-symbol "^1.0.3"
-
-which-typed-array@^1.1.2:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/which-typed-array/-/which-typed-array-1.1.6.tgz#f3713d801da0720a7f26f50c596980a9f5c8b383"
-  integrity sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==
-  dependencies:
-    available-typed-arrays "^1.0.4"
-    call-bind "^1.0.2"
-    es-abstract "^1.18.5"
-    foreach "^2.0.5"
-    has-tostringtag "^1.0.0"
-    is-typed-array "^1.1.6"
-
-widest-line@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/widest-line/-/widest-line-3.1.0.tgz#8292333bbf66cb45ff0de1603b136b7ae1496eca"
-  integrity sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==
-  dependencies:
-    string-width "^4.0.0"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
-
-write-file-atomic@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-3.0.3.tgz#56bd5c5a5c70481cd19c571bd39ab965a5de56e8"
-  integrity sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==
-  dependencies:
-    imurmurhash "^0.1.4"
-    is-typedarray "^1.0.0"
-    signal-exit "^3.0.2"
-    typedarray-to-buffer "^3.1.5"
-
-ws@^3.0.0:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-3.3.3.tgz#f1cf84fe2d5e901ebce94efaece785f187a228f2"
-  integrity sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==
-  dependencies:
-    async-limiter "~1.0.0"
-    safe-buffer "~5.1.0"
-    ultron "~1.1.0"
-
-xdg-basedir@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz#4bc8d9984403696225ef83a1573cbbcb4e79db13"
-  integrity sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==
-
-xhr-request-promise@^0.1.2:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz#2d5f4b16d8c6c893be97f1a62b0ed4cf3ca5f96c"
-  integrity sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==
-  dependencies:
-    xhr-request "^1.1.0"
-
-xhr-request@^1.0.1, xhr-request@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr-request/-/xhr-request-1.1.0.tgz#f4a7c1868b9f198723444d82dcae317643f2e2ed"
-  integrity sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==
-  dependencies:
-    buffer-to-arraybuffer "^0.0.5"
-    object-assign "^4.1.1"
-    query-string "^5.0.1"
-    simple-get "^2.7.0"
-    timed-out "^4.0.1"
-    url-set-query "^1.0.0"
-    xhr "^2.0.4"
-
-xhr2-cookies@1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz#7d77449d0999197f155cb73b23df72505ed89d48"
-  integrity sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=
-  dependencies:
-    cookiejar "^2.1.1"
-
-xhr@^2.0.4, xhr@^2.3.3:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/xhr/-/xhr-2.6.0.tgz#b69d4395e792b4173d6b7df077f0fc5e4e2b249d"
-  integrity sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==
-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
-  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
-
-yaeti@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
-
-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step29_web3_inspect_blocks/.gitignore b/step29_web3_inspect_blocks/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step29_web3_inspect_blocks/.gitignore
+++ b/step29_web3_inspect_blocks/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step29_web3_inspect_blocks/EthNetwork.ts b/step29_web3_inspect_blocks/EthNetwork.ts
new file mode 100755
index 0000000..8183923
--- /dev/null
+++ b/step29_web3_inspect_blocks/EthNetwork.ts
@@ -0,0 +1,71 @@
+import Web3 from "web3";
+
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+
+export class EthNetwork {
+  private web3: Web3;
+
+  /**
+   * Creates an instance of EthNetwork object.
+   */
+  constructor() {
+    this.web3 = new Web3(RPC_ENDPOINT);
+  }
+
+  /**
+   * Get the number of the latest block on Ethereum Mainnet.
+   * @returns latest block number.
+   */
+  public getLatestBlockNumber = async () => {
+    return await this.web3.eth.getBlockNumber();
+  };
+
+  /**
+   * Fetch a block of given number or hash from the Ethereum Mainnet.
+   * @param block number or hash of the block.
+   * @returns a block of given number or Hash.
+   */
+  public getBlock = async (block: number | string) => {
+    return await this.web3.eth.getBlock(block);
+  };
+
+  /**
+   * Get the number of transaction in a block of given number or Hash.
+   * @param block (Optional) Hash or number of the block- default is "latest".
+   * @returns number of transactions in the block.
+   */
+  public getBlockTransactionCount = async (
+    block: string | number = "latest"
+  ) => {
+    return await this.web3.eth.getBlockTransactionCount(block);
+  };
+
+  /**
+   * Get a specific transaction from a block of given number.
+   * @param trxIndex index of the transaction in the block.
+   * @param block (Optional) Hash or number of the block- default is "latest".
+   * @returns transactions object for the required transaction.
+   */
+  public getTransactionFromBlock = async (
+    trxIndex: number,
+    block: string | number = "latest"
+  ) => {
+    return await this.web3.eth.getTransactionFromBlock(block, trxIndex);
+  };
+
+  /**
+   * Fetch a given number of latest blocks from Ethereum Mainnet.
+   * @param numberOfBlocks (Optional) number of blocks to fetch. Default is `10`.
+   */
+  public getLatestXBlocks = async (numberOfBlocks: number = 10) => {
+    const latestBlock = await this.getLatestBlockNumber();
+
+    let blocks: Array = [];
+    for (let i = 0; i < numberOfBlocks; ++i) {
+      blocks.push(await this.getBlock(latestBlock - i));
+    }
+    return blocks;
+  };
+}
diff --git a/step29_web3_inspect_blocks/index.ts b/step29_web3_inspect_blocks/index.ts
index b936f47..d3fb77c 100644
--- a/step29_web3_inspect_blocks/index.ts
+++ b/step29_web3_inspect_blocks/index.ts
@@ -1,25 +1,33 @@
-import { InspectBlocks } from './inspectBlocks';
-
-const blocks : InspectBlocks = new InspectBlocks();
-
-// get latest block number
-blocks.getBlockNumber().then((res)=>console.log('latest Block Number -------',res))
-
-// you can also write the block number or hash of the block to get info about a block
-
-// I am only logging the block hash here. Feel free to log other info about the block
-blocks.fetchBlock('latest').then((res)=>console.log('Block hash -------',res.hash))
-
-// get latest 10 blocks
-blocks.getBlockNumber().then((latest)=>{
-    for (let i=0; i< 10; i++){
-        blocks.fetchBlock(latest-i).then((block)=>console.log(block.number))
-    }
-})
-
-
-// number of transaction in a block
-blocks.getBlockTransactionCount('latest').then((res)=>console.log('Block transaction count -------',res))
-
-// get a particular transaction from a block. In this case we are getting the 3rd transaction from the latest block (transactions' index start from 0)
-blocks.getTransactionFromBlock('latest',2).then((res)=>console.log('Transaction info -------',res))
+import { EthNetwork } from "./EthNetwork";
+
+(async () => {
+  const network = new EthNetwork();
+
+  // #1
+  console.log("Latest Block Number:", await network.getLatestBlockNumber());
+
+  // #2
+  const blockNumber = 13101095;
+  const block = await network.getBlock(blockNumber);
+  // I am only logging the block hash here.
+  // Feel free to log other info about the block
+  console.log(`Block Hash of Block #${blockNumber}:`, block.hash);
+
+  // #3
+  console.log(
+    `Number of Txns in Block #${blockNumber}:`,
+    await network.getBlockTransactionCount(blockNumber)
+  );
+
+  // #4
+  console.log(
+    `First Transaction in Block #${blockNumber}:`,
+    (await network.getTransactionFromBlock(0, blockNumber)).hash
+  );
+
+  // #5
+  console.log("Number of Transactions in 10 Latest Blocks:");
+  (await network.getLatestXBlocks()).forEach(block => {
+    console.log(`Block Number ${block.number} ==>`, block.transactions.length);
+  });
+})();
diff --git a/step29_web3_inspect_blocks/inspectBlocks.ts b/step29_web3_inspect_blocks/inspectBlocks.ts
deleted file mode 100644
index fb78bf8..0000000
--- a/step29_web3_inspect_blocks/inspectBlocks.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-import Web3 from 'web3';
-
-
-export class InspectBlocks {
-  private web3: Web3
-
-
-  public constructor() {
-
-    // use mainnet endpoint here 
-    this.web3 = new Web3("Enter_your_mainnet_RPC_endpoint");
-
-
-  }
-
-  public async getBlockNumber() {
-
-    return await this.web3.eth.getBlockNumber()
-
-  }
-
-
-  public async fetchBlock(block: string | number) {
-
-    return await this.web3.eth.getBlock(block)
-
-  }
-
-
-  public async getBlockTransactionCount(block: string | number) {
-
-    return await this.web3.eth.getBlockTransactionCount(block)
-
-  }
-
-
-  public async getTransactionFromBlock(block: string | number, transactionNumber: number) {
-
-    return await this.web3.eth.getTransactionFromBlock(block, transactionNumber)
-
-  }
-
-
-
-
-
-
-}
-
diff --git a/step29_web3_inspect_blocks/package-lock.json b/step29_web3_inspect_blocks/package-lock.json
new file mode 100644
index 0000000..1b02165
--- /dev/null
+++ b/step29_web3_inspect_blocks/package-lock.json
@@ -0,0 +1,9715 @@
+{
+  "name": "step29",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "step29",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "web3": "^1.5.2"
+      },
+      "devDependencies": {
+        "@types/node": "^12.20.19",
+        "nodemon": "^2.0.12",
+        "ts-node-dev": "^1.1.8",
+        "tslint": "^6.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
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+      "dev": true
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+}
diff --git a/step29_web3_inspect_blocks/package.json b/step29_web3_inspect_blocks/package.json
index 6f59dd0..7000216 100644
--- a/step29_web3_inspect_blocks/package.json
+++ b/step29_web3_inspect_blocks/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
diff --git a/step29_web3_inspect_blocks/readme.md b/step29_web3_inspect_blocks/readme.md
index d4b45f1..c62f51b 100644
--- a/step29_web3_inspect_blocks/readme.md
+++ b/step29_web3_inspect_blocks/readme.md
@@ -1,20 +1,40 @@
-# Inspect Blocks
+# Step 29: Inspect Blocks
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=DFCCcgr9dAQ&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=7)
+## References:
 
-In this example we will get information about different blocks in the main etherium blockchain and inspect them.
+1.  We will follow this [video tutorial](https://www.youtube.com/watch?v=DFCCcgr9dAQ&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=7) in this step.
 
+In this example, we will get information about different blocks in the Etherium Mainnet and inspect them.
 
-npm link typescript
+## Step 1
 
-npm start
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-or
+## Step 2
 
-tsc
+Create `EthNetwork.ts` and `index.ts` files. In `EthNetwork.ts` file, replace INFURA_PROJECT_ID with your Infura project ID.
 
-node index
+```ts
+// Ropsten Test Network endpoint.
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
+
+In `EthNetwork.ts`, we have implemented different methods to fetch and explore Ethereum blocks.
 
+## Step 3
 
+Run the project with the following command:
 
+```bash
+npm link typescript
+npm start
+```
+
+or with these commands.
 
+```bash
+tsc
+node index
+```
diff --git a/step29_web3_inspect_blocks/tsconfig.json b/step29_web3_inspect_blocks/tsconfig.json
index 07d2004..a24a581 100644
--- a/step29_web3_inspect_blocks/tsconfig.json
+++ b/step29_web3_inspect_blocks/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step29_web3_inspect_blocks/tslint.json b/step29_web3_inspect_blocks/tslint.json
index 24388b8..a64df52 100644
--- a/step29_web3_inspect_blocks/tslint.json
+++ b/step29_web3_inspect_blocks/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step29_web3_inspect_blocks/yarn.lock b/step29_web3_inspect_blocks/yarn.lock
deleted file mode 100644
index 573e692..0000000
--- a/step29_web3_inspect_blocks/yarn.lock
+++ /dev/null
@@ -1,3606 +0,0 @@
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-  resolved "https://registry.yarnpkg.com/cors/-/cors-2.8.5.tgz#eac11da51592dd86b9f06f6e7ac293b3df875d29"
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-  version "4.0.4"
-  resolved "https://registry.yarnpkg.com/create-ecdh/-/create-ecdh-4.0.4.tgz#d6e7f4bffa66736085a0762fd3a632684dabcc4e"
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-  version "1.1.7"
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-  resolved "https://registry.yarnpkg.com/create-require/-/create-require-1.1.1.tgz#c1d7e8f1e5f6cfc9ff65f9cd352d37348756c333"
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-  version "3.12.0"
-  resolved "https://registry.yarnpkg.com/crypto-browserify/-/crypto-browserify-3.12.0.tgz#396cf9f3137f03e4b8e532c58f698254e00f80ec"
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-    diffie-hellman "^5.0.0"
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-    public-encrypt "^4.0.0"
-    randombytes "^2.0.0"
-    randomfill "^1.0.3"
-
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/crypto-random-string/-/crypto-random-string-2.0.0.tgz#ef2a7a966ec11083388369baa02ebead229b30d5"
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-  resolved "https://registry.yarnpkg.com/d/-/d-1.0.1.tgz#8698095372d58dbee346ffd0c7093f99f8f9eb5a"
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-    type "^1.0.1"
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-  version "1.14.1"
-  resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
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-  version "2.6.9"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
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-  version "3.2.7"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.7.tgz#72580b7e9145fb39b6676f9c5e5fb100b934179a"
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-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
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-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/decompress-response/-/decompress-response-3.3.0.tgz#80a4dd323748384bfa248083622aedec982adff3"
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-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
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-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/defer-to-connect/-/defer-to-connect-1.1.3.tgz#331ae050c08dcf789f8c83a7b81f0ed94f4ac591"
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-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.3.tgz#cf88da6cbee26fe6db7094f61d870cbd84cee9f1"
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
-  integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.2.tgz#9bcd52e14c097763e749b274c4346ed2e560b5a9"
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/des.js/-/des.js-1.0.1.tgz#5382142e1bdc53f85d86d53e5f4aa7deb91e0843"
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-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/destroy/-/destroy-1.0.4.tgz#978857442c44749e4206613e37946205826abd80"
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-  version "5.0.3"
-  resolved "https://registry.yarnpkg.com/diffie-hellman/-/diffie-hellman-5.0.3.tgz#40e8ee98f55a2149607146921c63e1ae5f3d2875"
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-  version "0.1.2"
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-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-5.3.0.tgz#90ccce708cd9cd82cc4dc8c3ddd9abdd55b20e88"
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-  version "0.1.4"
-  resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
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-  resolved "https://registry.yarnpkg.com/dynamic-dedupe/-/dynamic-dedupe-0.3.0.tgz#06e44c223f5e4e94d78ef9db23a6515ce2f962a1"
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-    p-cancelable "^1.0.0"
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-    url-parse-lax "^1.0.0"
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-2.0.0.tgz#a94c2224ebcac04782a0d9035521f24735b7ec92"
-  integrity sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=
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-  version "1.0.1"
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-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
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-  version "1.0.0"
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-  resolved "https://registry.yarnpkg.com/idna-uts46-hx/-/idna-uts46-hx-2.3.1.tgz#a1dc5c4df37eee522bf66d969cc980e00e8711f9"
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-  version "3.0.0"
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-  version "0.9.0"
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-    web3-net "1.5.2"
-    web3-utils "1.5.2"
-
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-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-net/-/web3-net-1.5.2.tgz#58915d7e2dad025d2a08f02c865f3abe61c48eff"
-  integrity sha512-VEc9c+jfoERhbJIxnx0VPlQDot8Lm4JW/tOWFU+ekHgIiu2zFKj5YxhURIth7RAbsaRsqCb79aE+M0eI8maxVQ==
-  dependencies:
-    web3-core "1.5.2"
-    web3-core-method "1.5.2"
-    web3-utils "1.5.2"
-
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-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-providers-http/-/web3-providers-http-1.5.2.tgz#94f95fe5572ca54aa2c2ffd42c63956436c9eb0a"
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-  dependencies:
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-    xhr2-cookies "1.1.0"
-
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-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-providers-ipc/-/web3-providers-ipc-1.5.2.tgz#68a516883c998eeddf60df4cead77baca4fb4aaa"
-  integrity sha512-SJC4Sivt4g9LHKlRy7cs1jkJgp7bjrQeUndE6BKs0zNALKguxu6QYnzbmuHCTFW85GfMDjhvi24jyyZHMnBNXQ==
-  dependencies:
-    oboe "2.1.5"
-    web3-core-helpers "1.5.2"
-
-web3-providers-ws@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-providers-ws/-/web3-providers-ws-1.5.2.tgz#d336a93ed608b40cdcadfadd1f1bc8d32ea046e0"
-  integrity sha512-xy9RGlyO8MbJDuKv2vAMDkg+en+OvXG0CGTCM2BTl6l1vIdHpCa+6A/9KV2rK8aU9OBZ7/Pf+Y19517kHVl9RA==
-  dependencies:
-    eventemitter3 "4.0.4"
-    web3-core-helpers "1.5.2"
-    websocket "^1.0.32"
-
-web3-shh@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-shh/-/web3-shh-1.5.2.tgz#a72a3d903c0708a004db94a72d934a302d880aea"
-  integrity sha512-wOxOcYt4Sa0AHAI8gG7RulCwVuVjSRS/M/AbFsea3XfJdN6sU13/syY7OdZNjNYuKjYTzxKYrd3dU/K2iqffVw==
-  dependencies:
-    web3-core "1.5.2"
-    web3-core-method "1.5.2"
-    web3-core-subscriptions "1.5.2"
-    web3-net "1.5.2"
-
-web3-utils@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3-utils/-/web3-utils-1.5.2.tgz#150982dcb1918ffc54eba87528e28f009ebc03aa"
-  integrity sha512-quTtTeQJHYSxAwIBOCGEcQtqdVcFWX6mCFNoqnp+mRbq+Hxbs8CGgO/6oqfBx4OvxIOfCpgJWYVHswRXnbEu9Q==
-  dependencies:
-    bn.js "^4.11.9"
-    eth-lib "0.2.8"
-    ethereum-bloom-filters "^1.0.6"
-    ethjs-unit "0.1.6"
-    number-to-bn "1.7.0"
-    randombytes "^2.1.0"
-    utf8 "3.0.0"
-
-web3@^1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/web3/-/web3-1.5.2.tgz#736ca2f39048c63964203dd811f519400973e78d"
-  integrity sha512-aapKLdO8t7Cos6tZLeeQUtCJvTiPMlLcHsHHDLSBZ/VaJEucSTxzun32M8sp3BmF4waDEmhY+iyUM1BKvtAcVQ==
-  dependencies:
-    web3-bzz "1.5.2"
-    web3-core "1.5.2"
-    web3-eth "1.5.2"
-    web3-eth-personal "1.5.2"
-    web3-net "1.5.2"
-    web3-shh "1.5.2"
-    web3-utils "1.5.2"
-
-websocket@^1.0.32:
-  version "1.0.34"
-  resolved "https://registry.yarnpkg.com/websocket/-/websocket-1.0.34.tgz#2bdc2602c08bf2c82253b730655c0ef7dcab3111"
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-  dependencies:
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-    debug "^2.2.0"
-    es5-ext "^0.10.50"
-    typedarray-to-buffer "^3.1.5"
-    utf-8-validate "^5.0.2"
-    yaeti "^0.0.6"
-
-which-boxed-primitive@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"
-  integrity sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==
-  dependencies:
-    is-bigint "^1.0.1"
-    is-boolean-object "^1.1.0"
-    is-number-object "^1.0.4"
-    is-string "^1.0.5"
-    is-symbol "^1.0.3"
-
-which-typed-array@^1.1.2:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/which-typed-array/-/which-typed-array-1.1.6.tgz#f3713d801da0720a7f26f50c596980a9f5c8b383"
-  integrity sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==
-  dependencies:
-    available-typed-arrays "^1.0.4"
-    call-bind "^1.0.2"
-    es-abstract "^1.18.5"
-    foreach "^2.0.5"
-    has-tostringtag "^1.0.0"
-    is-typed-array "^1.1.6"
-
-widest-line@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/widest-line/-/widest-line-3.1.0.tgz#8292333bbf66cb45ff0de1603b136b7ae1496eca"
-  integrity sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==
-  dependencies:
-    string-width "^4.0.0"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
-
-write-file-atomic@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-3.0.3.tgz#56bd5c5a5c70481cd19c571bd39ab965a5de56e8"
-  integrity sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==
-  dependencies:
-    imurmurhash "^0.1.4"
-    is-typedarray "^1.0.0"
-    signal-exit "^3.0.2"
-    typedarray-to-buffer "^3.1.5"
-
-ws@^3.0.0:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-3.3.3.tgz#f1cf84fe2d5e901ebce94efaece785f187a228f2"
-  integrity sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==
-  dependencies:
-    async-limiter "~1.0.0"
-    safe-buffer "~5.1.0"
-    ultron "~1.1.0"
-
-xdg-basedir@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz#4bc8d9984403696225ef83a1573cbbcb4e79db13"
-  integrity sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==
-
-xhr-request-promise@^0.1.2:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz#2d5f4b16d8c6c893be97f1a62b0ed4cf3ca5f96c"
-  integrity sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==
-  dependencies:
-    xhr-request "^1.1.0"
-
-xhr-request@^1.0.1, xhr-request@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr-request/-/xhr-request-1.1.0.tgz#f4a7c1868b9f198723444d82dcae317643f2e2ed"
-  integrity sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==
-  dependencies:
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-    object-assign "^4.1.1"
-    query-string "^5.0.1"
-    simple-get "^2.7.0"
-    timed-out "^4.0.1"
-    url-set-query "^1.0.0"
-    xhr "^2.0.4"
-
-xhr2-cookies@1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz#7d77449d0999197f155cb73b23df72505ed89d48"
-  integrity sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=
-  dependencies:
-    cookiejar "^2.1.1"
-
-xhr@^2.0.4, xhr@^2.3.3:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/xhr/-/xhr-2.6.0.tgz#b69d4395e792b4173d6b7df077f0fc5e4e2b249d"
-  integrity sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==
-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
-  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
-
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-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
-
-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
diff --git a/step30_web3_utils/.gitignore b/step30_web3_utils/.gitignore
index 3dcb37e..d22c9cd 100644
--- a/step30_web3_utils/.gitignore
+++ b/step30_web3_utils/.gitignore
@@ -1,2 +1,5 @@
+# Node packages
 node_modules
-*.js
\ No newline at end of file
+
+# Build files created by TypeScript Compiler
+*.js
diff --git a/step30_web3_utils/index.ts b/step30_web3_utils/index.ts
index 73789d7..d694c35 100644
--- a/step30_web3_utils/index.ts
+++ b/step30_web3_utils/index.ts
@@ -1,15 +1,26 @@
-import { Utils } from './utils';
+import Web3 from "web3";
 
-const utils : Utils = new Utils();
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
 
-// get avg gas price of the network
-utils.getAvgGasPrice().then((res)=>console.log('Avg gas price on network in ether -------',res))
+const web3 = new Web3(RPC_ENDPOINT);
 
-//sha3 hashing
-utils.hashing('hello world').then((res)=>console.log('hash -------',res))
+(async () => {
+  // #1
+  const avgGasPrice = web3.utils.fromWei(await web3.eth.getGasPrice(), "ether");
+  console.log("Average Gas Price ==>", avgGasPrice, "ETH");
 
-//solidity sha3 hashing
-utils.Solidityhashing('hello world').then((res)=>console.log('Solidity hash -------',res))
+  // #2
+  const phrase = "DApp is Fun";
+  const hash = web3.utils.sha3(phrase);
+  console.log(`Hash of "${phrase}" ==>`, hash);
 
-//generate a random hex value. Enter the byte size in the function parameter
-utils.generateRandomHex(4).then((res)=>console.log('random hex -------',res))
+  // #3
+  const hash2 = web3.utils.soliditySha3(phrase);
+  console.log(`Hash of "${phrase}" ==>`, hash2);
+
+  // #4
+  const randomHex = web3.utils.randomHex(16);
+  console.log("Random Hex of size 16 ==>", randomHex);
+})();
diff --git a/step30_web3_utils/package-lock.json b/step30_web3_utils/package-lock.json
new file mode 100644
index 0000000..8e01bad
--- /dev/null
+++ b/step30_web3_utils/package-lock.json
@@ -0,0 +1,9715 @@
+{
+  "name": "step30",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "step30",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "web3": "^1.5.2"
+      },
+      "devDependencies": {
+        "@types/node": "^12.20.19",
+        "nodemon": "^2.0.12",
+        "ts-node-dev": "^1.1.8",
+        "tslint": "^6.1.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.14.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
+      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@ethereumjs/common": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.4.0.tgz",
+      "integrity": "sha512-UdkhFWzWcJCZVsj1O/H8/oqj/0RVYjLc1OhPjBrQdALAkQHpCp8xXI4WLnuGTADqTdJZww0NtgwG+TRPkXt27w==",
+      "dependencies": {
+        "crc-32": "^1.2.0",
+        "ethereumjs-util": "^7.1.0"
+      }
+    },
+    "node_modules/@ethereumjs/tx": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.3.0.tgz",
+      "integrity": "sha512-yTwEj2lVzSMgE6Hjw9Oa1DZks/nKTWM8Wn4ykDNapBPua2f4nXO3qKnni86O6lgDj5fVNRqbDsD0yy7/XNGDEA==",
+      "dependencies": {
+        "@ethereumjs/common": "^2.4.0",
+        "ethereumjs-util": "^7.1.0"
+      }
+    },
+    "node_modules/@ethersproject/abi": {
+      "version": "5.0.7",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.0.7.tgz",
+      "integrity": "sha512-Cqktk+hSIckwP/W8O47Eef60VwmoSC/L3lY0+dIBhQPCNn9E4V7rwmm2aFrNRRDJfFlGuZ1khkQUOc3oBX+niw==",
+      "dependencies": {
+        "@ethersproject/address": "^5.0.4",
+        "@ethersproject/bignumber": "^5.0.7",
+        "@ethersproject/bytes": "^5.0.4",
+        "@ethersproject/constants": "^5.0.4",
+        "@ethersproject/hash": "^5.0.4",
+        "@ethersproject/keccak256": "^5.0.3",
+        "@ethersproject/logger": "^5.0.5",
+        "@ethersproject/properties": "^5.0.3",
+        "@ethersproject/strings": "^5.0.4"
+      }
+    },
+    "node_modules/@ethersproject/abstract-provider": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.4.1.tgz",
+      "integrity": "sha512-3EedfKI3LVpjSKgAxoUaI+gB27frKsxzm+r21w9G60Ugk+3wVLQwhi1LsEJAKNV7WoZc8CIpNrATlL1QFABjtQ==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/networks": "^5.4.0",
+        "@ethersproject/properties": "^5.4.0",
+        "@ethersproject/transactions": "^5.4.0",
+        "@ethersproject/web": "^5.4.0"
+      }
+    },
+    "node_modules/@ethersproject/abstract-signer": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.4.1.tgz",
+      "integrity": "sha512-SkkFL5HVq1k4/25dM+NWP9MILgohJCgGv5xT5AcRruGz4ILpfHeBtO/y6j+Z3UN/PAjDeb4P7E51Yh8wcGNLGA==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abstract-provider": "^5.4.0",
+        "@ethersproject/bignumber": "^5.4.0",
+        "@ethersproject/bytes": "^5.4.0",
+        "@ethersproject/logger": "^5.4.0",
+        "@ethersproject/properties": "^5.4.0"
+      }
+    },
+    "node_modules/@ethersproject/address": {
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.4.0.tgz",
+      "integrity": "sha512-SD0VgOEkcACEG/C6xavlU1Hy3m5DGSXW3CUHkaaEHbAPPsgi0coP5oNPsxau8eTlZOk/bpa/hKeCNoK5IzVI2Q==",
+      "funding": [
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+  }
+}
diff --git a/step30_web3_utils/package.json b/step30_web3_utils/package.json
index d6cab15..e46df58 100644
--- a/step30_web3_utils/package.json
+++ b/step30_web3_utils/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "ts-node-dev --respawn index.ts "
+    "start": "ts-node-dev --respawn index.ts"
   },
   "author": "waris hasan",
   "license": "ISC",
diff --git a/step30_web3_utils/readme.md b/step30_web3_utils/readme.md
index 55fd192..51ef1ea 100644
--- a/step30_web3_utils/readme.md
+++ b/step30_web3_utils/readme.md
@@ -1,19 +1,38 @@
-# Using some utility functions in Web3js
+# Step 30: Using Some Utility Functions in Web3JS
 
-[Watch Video Tutorial](https://www.youtube.com/watch?v=C5Kv77_AUFE&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=8)
+## References:
 
-In this example we will be using some of the basic ulity functions provided by web3js.
+1.  We will follow this [video tutorial](https://www.youtube.com/watch?v=C5Kv77_AUFE&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN&index=8) in this step.
 
-npm link typescript
+In this example, we will be using some of the basic ulity functions provided by Web3JS.
 
-npm start
+## Step 1
 
-or
+Create `packacge.json`, `tsconfig.json` and `tslint.json` files as in [Step21](../step21_web3_node_getbalance). Also, install the same dependencies, and add the same scripts in `package.json`.
 
-tsc
+## Step 2
 
-node index
+Create `index.ts` file. In this file, We have used different Web3JS utility functions. Replace INFURA_PROJECT_ID with your Infura project ID.
+
+```ts
+// Ropsten Test Network endpoint.
+const network = "mainnet";
+const INFURA_PROJECT_ID = "INFURA_PROJECT_ID";
+const RPC_ENDPOINT = `https://${network}.infura.io/v3/${INFURA_PROJECT_ID}`;
+```
 
+## Step 3
 
+Run the project with the following command:
 
+```bash
+npm link typescript
+npm start
+```
+
+or with these commands.
 
+```bash
+tsc
+node index
+```
diff --git a/step30_web3_utils/tsconfig.json b/step30_web3_utils/tsconfig.json
index 07d2004..a24a581 100644
--- a/step30_web3_utils/tsconfig.json
+++ b/step30_web3_utils/tsconfig.json
@@ -1,17 +1,16 @@
 {
-    "compilerOptions": {
-      
-      "allowSyntheticDefaultImports": true,
-      "esModuleInterop": true,
-      "lib": ["ES2020"],
-      "module": "commonjs",
-      "moduleResolution": "node",
-      "target": "ES2020",
-      "strictNullChecks": true,
-      "strictPropertyInitialization": true,
-      "noImplicitThis": true,
-      "strictBindCallApply": true,
-      "noImplicitAny": true,
-      
-    }
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": ["ES2020"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "ES2020",
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "strictBindCallApply": true,
+    "noImplicitAny": true,
+    "resolveJsonModule": true
+  }
 }
diff --git a/step30_web3_utils/tslint.json b/step30_web3_utils/tslint.json
index 24388b8..a64df52 100644
--- a/step30_web3_utils/tslint.json
+++ b/step30_web3_utils/tslint.json
@@ -1,9 +1,9 @@
 {
-    "defaultSeverity": "error",
-    "extends": ["tslint:recommended"],
-    "jsRules": {},
-    "rules": {
-      "no-console": false
-    },
-    "rulesDirectory": []
-  }
\ No newline at end of file
+  "defaultSeverity": "error",
+  "extends": ["tslint:recommended"],
+  "jsRules": {},
+  "rules": {
+    "no-console": false
+  },
+  "rulesDirectory": []
+}
diff --git a/step30_web3_utils/utils.ts b/step30_web3_utils/utils.ts
deleted file mode 100644
index ef9d4ee..0000000
--- a/step30_web3_utils/utils.ts
+++ /dev/null
@@ -1,55 +0,0 @@
-import Web3 from 'web3';
-
-
-export class Utils {
-  private web3: Web3
-
-
-  public constructor() {
-
-    // use mainnet endpoint here 
-    this.web3 = new Web3("ENTER_YOUR_MAINNET_RPC_ENDPOINT");
-
-
-  }
-
-  public async getAvgGasPrice() {
-
-    const gasPrice = await this.web3.eth.getGasPrice()
-
-    return this.web3.utils.fromWei(gasPrice, 'ether')
-
-  }
-
-
-  public async hashing(input: string) {
-
-    return this.web3.utils.sha3(input)
-
-  }
-
-
-  public async Solidityhashing(input: string) {
-
-    return this.web3.utils.soliditySha3(input)
-
-  }
-
-
-  public async generateRandomHex(byteSize: number) {
-
-    return this.web3.utils.randomHex(byteSize)
-
-  }
-
-  
-
-
-
-
-
-
-
-
-}
-
diff --git a/step30_web3_utils/yarn.lock b/step30_web3_utils/yarn.lock
deleted file mode 100644
index 573e692..0000000
--- a/step30_web3_utils/yarn.lock
+++ /dev/null
@@ -1,3606 +0,0 @@
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-# yarn lockfile v1
-
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-  version "0.9.0"
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-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
-  integrity sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=
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-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/pupa/-/pupa-2.1.1.tgz#f5e8fd4afc2c5d97828faa523549ed8744a20d62"
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-  version "6.7.0"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.7.0.tgz#41dc1a015e3d581f1621776be31afb2876a9b1bc"
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-  version "6.5.2"
-  resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
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-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/query-string/-/query-string-5.1.1.tgz#a78c012b71c17e05f2e3fa2319dd330682efb3cb"
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-  resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
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-  resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.4.0.tgz#a1ce6fb9c9bc356ca52e89256ab59059e13d0332"
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-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
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-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.6.0.tgz#74a370bd857116e245b29cc97340cd431a02a6c7"
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-  version "4.2.1"
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-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/registry-url/-/registry-url-5.1.0.tgz#e98334b50d5434b81136b44ec638d9c2009c5009"
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-  version "2.88.2"
-  resolved "https://registry.yarnpkg.com/request/-/request-2.88.2.tgz#d73c918731cb5a87da047e207234146f664d12b3"
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-    aws4 "^1.8.0"
-    caseless "~0.12.0"
-    combined-stream "~1.0.6"
-    extend "~3.0.2"
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-    http-signature "~1.2.0"
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-    oauth-sign "~0.9.0"
-    performance-now "^2.1.0"
-    qs "~6.5.2"
-    safe-buffer "^5.1.2"
-    tough-cookie "~2.5.0"
-    tunnel-agent "^0.6.0"
-    uuid "^3.3.2"
-
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-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.20.0.tgz#629a013fb3f70755d6f0b7935cc1c2c5378b1975"
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-    path-parse "^1.0.6"
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/responselike/-/responselike-1.0.2.tgz#918720ef3b631c5642be068f15ade5a46f4ba1e7"
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-  version "2.7.1"
-  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
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-
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-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/ripemd160/-/ripemd160-2.0.2.tgz#a1c1a6f624751577ba5d07914cbc92850585890c"
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-    inherits "^2.0.1"
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-  version "2.2.6"
-  resolved "https://registry.yarnpkg.com/rlp/-/rlp-2.2.6.tgz#c80ba6266ac7a483ef1e69e8e2f056656de2fb2c"
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-    bn.js "^4.11.1"
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-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
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-  version "5.2.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
-  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
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-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
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-
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-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-3.0.1.tgz#d314a57c2aef69d1ad98a138a21fe9eafa9ee312"
-  integrity sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA==
-
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-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/secp256k1/-/secp256k1-4.0.2.tgz#15dd57d0f0b9fdb54ac1fa1694f40e5e9a54f4a1"
-  integrity sha512-UDar4sKvWAksIlfX3xIaQReADn+WFnHvbVujpcbr+9Sf/69odMwy2MUsz5CKLQgX9nsIyrjuxL2imVyoNHa3fg==
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-    node-addon-api "^2.0.0"
-    node-gyp-build "^4.2.0"
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-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/semver-diff/-/semver-diff-3.1.1.tgz#05f77ce59f325e00e2706afd67bb506ddb1ca32b"
-  integrity sha512-GX0Ix/CJcHyB8c4ykpHGIAvLyOwOobtM/8d+TQkAd81/bEjgPHrfba41Vpesr7jX/t8Uh+R3EX9eAS5be+jQYg==
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-    semver "^6.3.0"
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-  version "5.7.1"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
-  integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
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-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
-  integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
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-  version "0.17.1"
-  resolved "https://registry.yarnpkg.com/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"
-  integrity sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==
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-    depd "~1.1.2"
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-    encodeurl "~1.0.2"
-    escape-html "~1.0.3"
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-    statuses "~1.5.0"
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-  version "1.14.1"
-  resolved "https://registry.yarnpkg.com/serve-static/-/serve-static-1.14.1.tgz#666e636dc4f010f7ef29970a88a674320898b2f9"
-  integrity sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==
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-    escape-html "~1.0.3"
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-  version "0.1.12"
-  resolved "https://registry.yarnpkg.com/servify/-/servify-0.1.12.tgz#142ab7bee1f1d033b66d0707086085b17c06db95"
-  integrity sha512-/xE6GvsKKqyo1BAY+KxOWXcLpPsUUyji7Qg3bVD7hh1eRze5bR1uYiuDA/k3Gof1s9BTzQZEJK8sNcNGFIzeWw==
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-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/setimmediate/-/setimmediate-1.0.5.tgz#290cbb232e306942d7d7ea9b83732ab7856f8285"
-  integrity sha1-KQy7Iy4waULX1+qbg3Mqt4VvgoU=
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-  resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.1.1.tgz#7e95acb24aa92f5885e0abef5ba131330d4ae683"
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-  resolved "https://registry.yarnpkg.com/sha.js/-/sha.js-2.4.11.tgz#37a5cf0b81ecbc6943de109ba2960d1b26584ae7"
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-  version "3.0.3"
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-  integrity sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==
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-  version "1.0.1"
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-which-boxed-primitive@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"
-  integrity sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==
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-    is-bigint "^1.0.1"
-    is-boolean-object "^1.1.0"
-    is-number-object "^1.0.4"
-    is-string "^1.0.5"
-    is-symbol "^1.0.3"
-
-which-typed-array@^1.1.2:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/which-typed-array/-/which-typed-array-1.1.6.tgz#f3713d801da0720a7f26f50c596980a9f5c8b383"
-  integrity sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==
-  dependencies:
-    available-typed-arrays "^1.0.4"
-    call-bind "^1.0.2"
-    es-abstract "^1.18.5"
-    foreach "^2.0.5"
-    has-tostringtag "^1.0.0"
-    is-typed-array "^1.1.6"
-
-widest-line@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/widest-line/-/widest-line-3.1.0.tgz#8292333bbf66cb45ff0de1603b136b7ae1496eca"
-  integrity sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==
-  dependencies:
-    string-width "^4.0.0"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
-
-write-file-atomic@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-3.0.3.tgz#56bd5c5a5c70481cd19c571bd39ab965a5de56e8"
-  integrity sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==
-  dependencies:
-    imurmurhash "^0.1.4"
-    is-typedarray "^1.0.0"
-    signal-exit "^3.0.2"
-    typedarray-to-buffer "^3.1.5"
-
-ws@^3.0.0:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-3.3.3.tgz#f1cf84fe2d5e901ebce94efaece785f187a228f2"
-  integrity sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==
-  dependencies:
-    async-limiter "~1.0.0"
-    safe-buffer "~5.1.0"
-    ultron "~1.1.0"
-
-xdg-basedir@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz#4bc8d9984403696225ef83a1573cbbcb4e79db13"
-  integrity sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==
-
-xhr-request-promise@^0.1.2:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz#2d5f4b16d8c6c893be97f1a62b0ed4cf3ca5f96c"
-  integrity sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==
-  dependencies:
-    xhr-request "^1.1.0"
-
-xhr-request@^1.0.1, xhr-request@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr-request/-/xhr-request-1.1.0.tgz#f4a7c1868b9f198723444d82dcae317643f2e2ed"
-  integrity sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==
-  dependencies:
-    buffer-to-arraybuffer "^0.0.5"
-    object-assign "^4.1.1"
-    query-string "^5.0.1"
-    simple-get "^2.7.0"
-    timed-out "^4.0.1"
-    url-set-query "^1.0.0"
-    xhr "^2.0.4"
-
-xhr2-cookies@1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz#7d77449d0999197f155cb73b23df72505ed89d48"
-  integrity sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=
-  dependencies:
-    cookiejar "^2.1.1"
-
-xhr@^2.0.4, xhr@^2.3.3:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/xhr/-/xhr-2.6.0.tgz#b69d4395e792b4173d6b7df077f0fc5e4e2b249d"
-  integrity sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==
-  dependencies:
-    global "~4.4.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xtend@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
-  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
-
-yaeti@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/yaeti/-/yaeti-0.0.6.tgz#f26f484d72684cf42bedfb76970aa1608fbf9577"
-  integrity sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=
-
-yallist@^3.0.0, yallist@^3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
-
-yn@3.1.1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
-  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==