diff --git a/lib/transaction/transaction.js b/lib/transaction/transaction.js
index d75d17c..ac8acdb 100644
--- a/lib/transaction/transaction.js
+++ b/lib/transaction/transaction.js
@@ -21,9 +21,10 @@ var MultiSigScriptHashInput = Input.MultiSigScriptHash;
 var Output = require('./output');
 var Script = require('../script');
 var PrivateKey = require('../privatekey');
-var Block = require('../block');
 var BN = require('../crypto/bn');
 
+var MAX_BLOCK_SIZE = 1000000;
+
 /**
  * Represents a transaction, a set of inputs and outputs to change ownership of tokens
  *
@@ -186,7 +187,6 @@ Transaction.prototype.getSerializationError = function(opts) {
   var feeIsTooLarge = this._isFeeTooLarge();
   var feeIsTooSmall = this._isFeeTooSmall();
   var isFullySigned = this.isFullySigned();
-  var hasDustOutputs = this._hasDustOutputs();
 
   if (!opts.disableLargeFees && feeIsTooLarge) {
     if (missingChange) {
@@ -982,37 +982,33 @@ Transaction.prototype.verify = function() {
     return 'transaction txouts empty';
   }
 
-  // Size limits
-  if (this.toBuffer().length > Block.MAX_BLOCK_SIZE) {
-    return 'transaction over the maximum block size';
-  }
-
   // Check for negative or overflow output values
   var valueoutbn = new BN(0);
   for (var i = 0; i < this.outputs.length; i++) {
     var txout = this.outputs[i];
-
     if (txout._satoshis > MAX_SAFE_INTEGER) {
       return 'transaction txout ' + i + ' satoshis greater than max safe integer';
     }
-
     if (txout._satoshis !== txout._satoshisBN.toNumber()) {
       return 'transaction txout ' + i + ' satoshis has corrupted value';
     }
-
-    var valuebn = new BN(txout._satoshis, 10);
-    if (valuebn.lt(BN.Zero)) {
+    if (txout._satoshis < 0) {
       return 'transaction txout ' + i + ' negative';
     }
-    if (valuebn.gt(new BN(Transaction.MAX_MONEY, 10))) {
+    if (txout._satoshisBN.gt(new BN(Transaction.MAX_MONEY, 10))) {
       return 'transaction txout ' + i + ' greater than MAX_MONEY';
     }
-    valueoutbn = valueoutbn.add(valuebn);
+    valueoutbn = valueoutbn.add(txout._satoshisBN);
     if (valueoutbn.gt(new BN(Transaction.MAX_MONEY))) {
       return 'transaction txout ' + i + ' total output greater than MAX_MONEY';
     }
   }
 
+  // Size limits
+  if (this.toBuffer().length > MAX_BLOCK_SIZE) {
+    return 'transaction over the maximum block size';
+  }
+
   // Check for duplicate inputs
   var txinmap = {};
   for (i = 0; i < this.inputs.length; i++) {
diff --git a/test/transaction/transaction.js b/test/transaction/transaction.js
index 2651038..27f8b5f 100644
--- a/test/transaction/transaction.js
+++ b/test/transaction/transaction.js
@@ -8,6 +8,7 @@ var _ = require('lodash');
 var sinon = require('sinon');
 
 var bitcore = require('../..');
+var BN = bitcore.crypto.BN;
 var Transaction = bitcore.Transaction;
 var PrivateKey = bitcore.PrivateKey;
 var Script = bitcore.Script;
@@ -355,7 +356,7 @@ describe('Transaction', function() {
       var buildSkipTest = function(builder, check) {
         return function() {
           var transaction = new Transaction();
-          transaction.from(simpleUtxoWith1BTC)
+          transaction.from(simpleUtxoWith1BTC);
           builder(transaction);
 
           var options = {};
@@ -410,6 +411,57 @@ describe('Transaction', function() {
     });
   });
 
+  describe('#verify', function() {
+
+    it('not if _satoshis and _satoshisBN have different values', function() {
+      var tx = new Transaction()
+        .from({
+          'txId': testPrevTx,
+          'outputIndex': 0,
+          'script': testScript,
+          'satoshis': testAmount
+        }).to('mrU9pEmAx26HcbKVrABvgL7AwA5fjNFoDc', testAmount - 10000);
+
+      tx.outputs[0]._satoshis = 100;
+      tx.outputs[0]._satoshisBN = new BN('fffffffffffffff', 16);
+      var verify = tx.verify();
+      verify.should.equal('transaction txout 0 satoshis has corrupted value');
+    });
+
+    it('not if _satoshis is negative', function() {
+      var tx = new Transaction()
+        .from({
+          'txId': testPrevTx,
+          'outputIndex': 0,
+          'script': testScript,
+          'satoshis': testAmount
+        }).to('mrU9pEmAx26HcbKVrABvgL7AwA5fjNFoDc', testAmount - 10000);
+
+      tx.outputs[0]._satoshis = -100;
+      tx.outputs[0]._satoshisBN = new BN(-100, 10);
+      var verify = tx.verify();
+      verify.should.equal('transaction txout 0 negative');
+    });
+
+    it('not if transaction is greater than max block size', function() {
+
+      var tx = new Transaction()
+        .from({
+          'txId': testPrevTx,
+          'outputIndex': 0,
+          'script': testScript,
+          'satoshis': testAmount
+        }).to('mrU9pEmAx26HcbKVrABvgL7AwA5fjNFoDc', testAmount - 10000);
+
+      tx.toBuffer = sinon.stub().returns({length: 10000000});
+
+      var verify = tx.verify();
+      verify.should.equal('transaction over the maximum block size');
+
+    });
+
+  });
+
   describe('to and from JSON', function() {
     it('takes a string that is a valid JSON and deserializes from it', function() {
       var simple = new Transaction();
@@ -616,7 +668,7 @@ describe('Transaction', function() {
       transaction.outputAmount.should.equal(99990000);
     });
     it('returns correct values for coinjoin transaction', function() {
-      // see livenet tx c16467eea05f1f30d50ed6dbc06a38539d9bb15110e4b7dc6653046a3678a718 
+      // see livenet tx c16467eea05f1f30d50ed6dbc06a38539d9bb15110e4b7dc6653046a3678a718
       var transaction = new Transaction(txCoinJoinHex);
       transaction.outputAmount.should.equal(4191290961);
       expect(function() {