diff --git a/api/package-lock.json b/api/package-lock.json
index a4f5118..bab6527 100644
--- a/api/package-lock.json
+++ b/api/package-lock.json
@@ -58,16 +58,27 @@
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+      "resolved": "https://registry.npmjs.org/@types/pbkdf2/-/pbkdf2-3.1.0.tgz",
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+      "requires": {
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+      "resolved": "https://registry.npmjs.org/@types/secp256k1/-/secp256k1-4.0.3.tgz",
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+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
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         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
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+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
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+        }
       }
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@@ -101,20 +120,28 @@
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+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.9.tgz",
+      "integrity": "sha512-H7JU6iBHTal1gp56aKoaa//YUxEaAOUiydvrV/pILqIHXTtqxSkATOnDA2u+jZ/61sD+L/412+7kzXRtWukhpQ==",
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-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
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+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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-      "integrity": "sha1-cYT23/XA/NK414ivy8MPOqkQR/w="
+      "integrity": "sha512-KXuWkfymvzBpfSda2Iwu0h006eVz58irfAqjACj27dWDtHjkh2ZIVJgNBjWQr5pKbH24gylq31+r4QiRwd11bQ=="
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-      "resolved": "https://registry.npmjs.org/bech32/-/bech32-1.1.3.tgz",
-      "integrity": "sha512-yuVFUvrNcoJi0sv5phmqc6P+Fl1HjRDRNOOkHY2X/3LBy2bIGNSFx4fZ95HMaXHupuS7cZR15AsvtmCIF4UEyg=="
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@@ -144,11 +171,16 @@
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+    "blakejs": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/blakejs/-/blakejs-1.2.1.tgz",
+      "integrity": "sha512-QXUSXI3QVc/gJME0dBpXrag1kbzOqCjCX8/b54ntNyW6sjtoqxqRk3LTmXzaJoh71zMsDCjM+47jS7XiwN/+fQ=="
+    },
     "bn": {
       "version": "git+https://github.com/shineabel/bn.git#91e1163deed0fcebd2233197c8f202e9bbc2d0ec",
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@@ -157,9 +189,9 @@
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-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
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+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
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@@ -181,7 +213,7 @@
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-      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8="
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@@ -218,26 +250,53 @@
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-      "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.0.tgz",
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-        "bn.js": "^4.1.0",
+        "bn.js": "^5.0.0",
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-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.0.4.tgz",
-      "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.1.tgz",
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       "requires": {
-        "bn.js": "^4.1.1",
-        "browserify-rsa": "^4.0.0",
+        "bn.js": "^5.1.1",
+        "browserify-rsa": "^4.0.1",
+        "create-hash": "^1.2.0",
+        "create-hmac": "^1.1.7",
+        "elliptic": "^6.5.3",
+        "inherits": "^2.0.4",
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+        "readable-stream": "^3.6.0",
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+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
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+        }
+      }
+    },
+    "bs58": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bs58/-/bs58-4.0.1.tgz",
+      "integrity": "sha512-Ok3Wdf5vOIlBrgCvTq96gBkJw+JUEzdBgyaza5HLtPm7yTHkjRy8+JzNyHF7BHa0bNWOQIp3m5YF0nnFcOIKLw==",
+      "requires": {
+        "base-x": "^3.0.2"
+      }
+    },
+    "bs58check": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/bs58check/-/bs58check-2.1.2.tgz",
+      "integrity": "sha512-0TS1jicxdU09dwJMNZtVAfzPi6Q6QeN0pM1Fkzrjn+XYHvzMKPU3pHVpva+769iNVSfIYWf7LJ6WR+BuuMf8cA==",
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-        "elliptic": "^6.0.0",
-        "inherits": "^2.0.1",
-        "parse-asn1": "^5.0.0"
+        "safe-buffer": "^5.1.2"
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@@ -252,7 +311,7 @@
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       "resolved": "https://registry.npmjs.org/buffer-xor/-/buffer-xor-1.0.3.tgz",
-      "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk="
+      "integrity": "sha512-571s0T7nZWK6vB67HI5dyUF7wXiNcfaPPPTl6zYCNApANjIvYJTg7hlud/+cJpdAhS7dVzqMLmfhfHR3rAcOjQ=="
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@@ -284,12 +343,12 @@
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-      "integrity": "sha1-CMBFaJIsJ3drii6BqV05M2LqC2U="
+      "integrity": "sha512-w20BOb1PiR/sEJdS6wNrUjF5CSfscZFUp7R9NSlXH8h2wynzXVEPFPJECAnkNylZ+cvf3p7TyRUHggDmrwXT9A=="
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-      "integrity": "sha1-ec5BqbsNA7z3LNxqjzxW+7xkQQo="
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@@ -302,12 +361,19 @@
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-      "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.3.tgz",
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+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.4.tgz",
+      "integrity": "sha512-mf+TCx8wWc9VpuxfP2ht0iSISLZnt0JgWlrOKZiNqyUZWnjIaCIVNQArMHnCZKfEYRg6IM7A+NeJoN8gf/Ws0A==",
       "requires": {
         "bn.js": "^4.1.0",
-        "elliptic": "^6.0.0"
+        "elliptic": "^6.5.3"
+      },
+      "dependencies": {
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+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA=="
+        }
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@@ -367,9 +433,9 @@
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-      "integrity": "sha1-wHTS4qpqipoH29YfmhXCzYPsjsw=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/des.js/-/des.js-1.0.1.tgz",
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@@ -388,12 +454,19 @@
         "bn.js": "^4.1.0",
         "miller-rabin": "^4.0.0",
         "randombytes": "^2.0.0"
+      },
+      "dependencies": {
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+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA=="
+        }
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-      "integrity": "sha1-Pja2xCs3BDgjzbwzLVjzHiRFSAs=",
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@@ -406,17 +479,24 @@
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+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
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-        "bn.js": "^4.4.0",
-        "brorand": "^1.0.1",
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
         "hash.js": "^1.0.0",
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-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "minimalistic-crypto-utils": "^1.0.0"
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
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+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA=="
+        }
       }
     },
     "encodeurl": {
@@ -437,7 +517,41 @@
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-      "integrity": "sha1-L9w1dvIykDNYl26znaeDIT/5Uj8="
+      "integrity": "sha512-EoltVQTRNg2Uy4o84qpa2aXymXDJhxm7eos/ACOg0DG4baAbMjhbdAEsx9GeE8sC3XCxnYvrrzZDH8D8MtA2iQ=="
+    },
+    "ethereum-cryptography": {
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+      "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz",
+      "integrity": "sha512-w8/4x1SGGzc+tO97TASLja6SLd3fRIK2tLVcV2Gx4IB21hE19atll5Cq9o3d0ZmAYC/8aw0ipieTSiekAea4SQ==",
+      "requires": {
+        "@types/pbkdf2": "^3.0.0",
+        "@types/secp256k1": "^4.0.1",
+        "blakejs": "^1.1.0",
+        "browserify-aes": "^1.2.0",
+        "bs58check": "^2.1.2",
+        "create-hash": "^1.2.0",
+        "create-hmac": "^1.1.7",
+        "hash.js": "^1.1.7",
+        "keccak": "^3.0.0",
+        "pbkdf2": "^3.0.17",
+        "randombytes": "^2.1.0",
+        "safe-buffer": "^5.1.2",
+        "scrypt-js": "^3.0.0",
+        "secp256k1": "^4.0.1",
+        "setimmediate": "^1.0.5"
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+          "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.3.tgz",
+          "integrity": "sha512-NLZVf+ROMxwtEj3Xa562qgv2BK5e2WNmXPiOdVIPLgs6lyTzMvBq0aWTYMI5XCP9jZMVKOcqZLw/Wc4vDkuxhA==",
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+            "node-gyp-build": "^4.2.0"
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     "ethereumjs-tx": {
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@@ -449,17 +563,24 @@
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