diff --git a/lib/pool.js b/lib/pool.js
index bba0454d7..377d795af 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -22,10 +22,6 @@ var log = function(severity, system, text, data){
 
 var cryptoNight = multiHashing['cryptonight'];
 
-function cryptoNightFast(buf) {
-    return cryptoNight(Buffer.concat([new Buffer([buf.length]), buf]), true);
-}
-
 var diff1 = bignum('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF', 16);
 
 var instanceId = crypto.randomBytes(4);
@@ -366,10 +362,10 @@ function recordShareData(miner, job, shareDiff, blockCandidate, hashHex, shareTy
 }
 
 function processShare(miner, job, blockTemplate, nonce, resultHash){
-    var shareBuffer = new Buffer(blockTemplate.buffer.length);
-    blockTemplate.buffer.copy(shareBuffer);
-    shareBuffer.writeUInt32BE(job.extraNonce, blockTemplate.reserveOffset);
-    new Buffer(nonce, 'hex').copy(shareBuffer, 39);
+    var template = new Buffer(blockTemplate.buffer.length);
+    blockTemplate.buffer.copy(template);
+    template.writeUInt32BE(job.extraNonce, blockTemplate.reserveOffset);
+    var shareBuffer = cnUtil.construct_block_blob(template, new Buffer(nonce, 'hex'));
 
     var convertedBlob;
     var hash;
@@ -399,7 +395,7 @@ function processShare(miner, job, blockTemplate, nonce, resultHash){
     var blockFastHash;
 
     if (hashDiff.ge(blockTemplate.difficulty)){
-        blockFastHash = cryptoNightFast(convertedBlob || cnUtil.convert_blob(shareBuffer)).toString('hex');
+        blockFastHash = cnUtil.get_block_id(shareBuffer).toString('hex');
 
         apiInterfaces.rpcDaemon('submitblock', [shareBuffer.toString('hex')], function(error, result){
             if (error){