diff --git a/lib/primitives/mtx.js b/lib/primitives/mtx.js
index b6c1f744..6040f522 100644
--- a/lib/primitives/mtx.js
+++ b/lib/primitives/mtx.js
@@ -10,7 +10,6 @@
 module.exports = MTX;
 
 var utils = require('../utils/utils');
-var crypto = require('../crypto/crypto');
 var assert = require('assert');
 var constants = require('../protocol/constants');
 var Network = require('../protocol/network');
@@ -482,13 +481,12 @@ MTX.prototype.signInput = function signInput(index, ring, type) {
  */
 
 MTX.prototype.signVector = function signVector(prev, vector, sig, ring) {
-  var pub = ring.publicKey;
   var i, m, n, keys, keyIndex, total;
 
   // P2PK
   if (prev.isPubkey()) {
     // Make sure the pubkey is ours.
-    if (!utils.equal(pub, prev.get(0)))
+    if (!utils.equal(ring.keyHash, prev.get(0)))
       return false;
 
     // Already signed.
@@ -507,7 +505,7 @@ MTX.prototype.signVector = function signVector(prev, vector, sig, ring) {
   // P2PKH
   if (prev.isPubkeyhash()) {
     // Make sure the pubkey hash is ours.
-    if (!utils.equal(crypto.hash160(pub), prev.get(2)))
+    if (!utils.equal(ring.keyHash, prev.get(2)))
       return false;
 
     // Already signed.
@@ -563,7 +561,7 @@ MTX.prototype.signVector = function signVector(prev, vector, sig, ring) {
 
     // Find the key index so we can place
     // the signature in the same index.
-    keyIndex = utils.indexOf(keys, pub);
+    keyIndex = utils.indexOf(keys, ring.publicKey);
 
     // Our public key is not in the prev_out
     // script. We tried to sign a transaction