diff --git a/lib/TransactionBuilder.js b/lib/TransactionBuilder.js
index cc34fff..e0cbfe3 100644
--- a/lib/TransactionBuilder.js
+++ b/lib/TransactionBuilder.js
@@ -105,7 +105,7 @@ function TransactionBuilder(opts) {
 
   // If any default opts is changed, TOOBJ_VERSION should be changed as
   // a caution measure.
- 
+
   this.lockTime = opts.lockTime || 0;
   this.spendUnconfirmed = opts.spendUnconfirmed || false;
 
@@ -464,7 +464,7 @@ TransactionBuilder._signHashAndVerify = function(wk, txSigHash) {
 };
 
 TransactionBuilder.prototype._checkTx = function() {
-  if (!this.tx ||  !this.tx.ins || !this.tx.ins.length || !this.tx.outs.length)
+  if (!this.tx || !this.tx.ins || !this.tx.ins.length || !this.tx.outs.length)
     throw new Error('tx is not defined');
 };
 
@@ -756,7 +756,7 @@ fnToSign[Script.TX_SCRIPTHASH] = TransactionBuilder.prototype._signScriptHash;
 //
 //
 TransactionBuilder.prototype.sign = function(keys) {
-  if (! (keys instanceof Array))
+  if (!(keys instanceof Array))
     throw new Error('parameter should be an array');
 
   this._checkTx();
@@ -844,7 +844,7 @@ TransactionBuilder.fromObj = function(data) {
 
   var b = new TransactionBuilder(data.opts);
   if (data.utxos) {
-    b.setUnspent(data.utxos); 
+    b.setUnspent(data.utxos);
 
     if (data.hashToScriptMap)
       b.setHashToScriptMap(data.hashToScriptMap);
@@ -856,7 +856,7 @@ TransactionBuilder.fromObj = function(data) {
         b.tx.ins[i].s = new Buffer(data.scriptSig[i], 'hex');
 
         var scriptSig = new Script(b.tx.ins[i].s);
-        if ( scriptSig.finishedMultiSig() !== false )
+        if (scriptSig.finishedMultiSig() !== false)
           b.inputsSigned++;
       }
     }
@@ -866,7 +866,7 @@ TransactionBuilder.fromObj = function(data) {
 
 
 TransactionBuilder.prototype._checkMergeability = function(b) {
-  if ( JSON.stringify(this.vanilla) !==  JSON.stringify(this.vanilla))
+  if (JSON.stringify(this.vanilla) !== JSON.stringify(this.vanilla))
     throw new Error('cannot merge: incompatible builders')
 };
 
@@ -910,16 +910,16 @@ TransactionBuilder.prototype._mergeInputSigP2sh = function(input, s0, s1) {
 
 // TODO: move this to script
 TransactionBuilder.prototype._getSighashType = function(sig) {
-  return sig[sig.length-1];
+  return sig[sig.length - 1];
 };
 
 
 TransactionBuilder.prototype._checkSignHash = function(s1) {
-  var l = s1.chunks.length-1;
+  var l = s1.chunks.length - 1;
 
-  for(var i=0; i<l; i++) {
+  for (var i = 0; i < l; i++) {
 
-    if (i==0 && s1.chunks[i] === 0) 
+    if (i == 0 && s1.chunks[i] === 0)
       continue;
 
     if (this._getSighashType(s1.chunks[i]) !== this.signhash)
@@ -990,7 +990,7 @@ TransactionBuilder.prototype._mergeTx = function(tx) {
       throw new Error('TX .o in mismatch in merge. Input:', i);
 
     i0.s = this._mergeInputSig(i, i0.s, i1.s);
-    this.vanilla.scriptSig[i]= i0.s.toString('hex');
+    this.vanilla.scriptSig[i] = i0.s.toString('hex');
 
     if (v0.isInputComplete(i)) this.inputsSigned++;
   }