diff --git a/benchmark/script.js b/benchmark/script.js
index 33229dc..7442d1a 100644
--- a/benchmark/script.js
+++ b/benchmark/script.js
@@ -24,6 +24,12 @@ async.series([
           scripts.push(input.script);
         }
       }
+      for (var k = 0; k < tx.outputs.length; k++) {
+        var output = tx.outputs[k];
+        if (output.script) {
+          scripts.push(output.script);
+        }
+      }
     }
 
     function isPublicKeyHashIn() {
diff --git a/lib/address.js b/lib/address.js
index f49acd7..4905ed1 100644
--- a/lib/address.js
+++ b/lib/address.js
@@ -7,7 +7,6 @@ var Base58Check = require('./encoding/base58check');
 var Networks = require('./networks');
 var Hash = require('./crypto/hash');
 var JSUtil = require('./util/js');
-var Script = require('./script');
 var PublicKey = require('./publickey');
 
 /**
@@ -505,3 +504,5 @@ Address.prototype.inspect = function() {
 };
 
 module.exports = Address;
+
+var Script = require('./script');
diff --git a/lib/crypto/hash.js b/lib/crypto/hash.js
index 0661a46..f6a625a 100644
--- a/lib/crypto/hash.js
+++ b/lib/crypto/hash.js
@@ -29,10 +29,19 @@ Hash.sha256sha256 = function(buf) {
 
 Hash.ripemd160 = function(buf) {
   $.checkArgument(BufferUtil.isBuffer(buf));
-  var hash = (new hashjs.ripemd160()).update(buf).digest();
-  return new Buffer(hash);
+  return crypto.createHash('ripemd160').update(buf).digest();
 };
 
+// Node.js crypto ripemd160 hashes are not supported in a browser
+// We'll replace with a (slower) version that does.
+if (global.window) {
+  Hash.ripemd160 = function(buf) {
+    $.checkArgument(BufferUtil.isBuffer(buf));
+    var hash = (new hashjs.ripemd160()).update(buf).digest();
+    return new Buffer(hash);
+  };
+}
+
 Hash.sha256ripemd160 = function(buf) {
   $.checkArgument(BufferUtil.isBuffer(buf));
   return Hash.ripemd160(Hash.sha256(buf));
diff --git a/lib/script/script.js b/lib/script/script.js
index 21fe7fb..5bcdce6 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -1,6 +1,6 @@
 'use strict';
 
-
+var Address = require('../address');
 var BufferReader = require('../encoding/bufferreader');
 var BufferWriter = require('../encoding/bufferwriter');
 var Hash = require('../crypto/hash');
@@ -8,7 +8,6 @@ var Opcode = require('../opcode');
 var PublicKey = require('../publickey');
 var Signature = require('../crypto/signature');
 var Networks = require('../networks');
-
 var $ = require('../util/preconditions');
 var _ = require('lodash');
 var errors = require('../errors');
@@ -29,8 +28,6 @@ var Script = function Script(from) {
   if (!(this instanceof Script)) {
     return new Script(from);
   }
-  var Address = require('../address');
-
   this.chunks = [];
 
   if (BufferUtil.isBuffer(from)) {
@@ -639,7 +636,6 @@ Script.buildP2SHMultisigIn = function(pubkeys, threshold, signatures, opts) {
  * @param {(Address|PublicKey)} to - destination address or public key
  */
 Script.buildPublicKeyHashOut = function(to) {
-  var Address = require('../address');
   $.checkArgument(!_.isUndefined(to));
   $.checkArgument(to instanceof PublicKey || to instanceof Address || _.isString(to));
   if (to instanceof PublicKey) {
@@ -692,7 +688,6 @@ Script.buildDataOut = function(data) {
  * @returns {Script} new pay to script hash script for given script
  */
 Script.buildScriptHashOut = function(script) {
-  var Address = require('../address');
   $.checkArgument(script instanceof Script ||
     (script instanceof Address && script.isPayToScriptHash()));
   var s = new Script();
@@ -745,7 +740,6 @@ Script.prototype.toScriptHashOut = function() {
  * @return {Script} an output script built from the address
  */
 Script.fromAddress = function(address) {
-  var Address = require('../address');
   address = Address(address);
   if (address.isPayToScriptHash()) {
     return Script.buildScriptHashOut(address);
@@ -756,12 +750,29 @@ Script.fromAddress = function(address) {
 };
 
 /**
- * @param {Network=} network
- * @return {Address|boolean} the associated address information object
- * for this script if any, or false
+ * Will return the associated address information object
+ * @return {Address|boolean}
  */
-Script.prototype.getAddressInfo = function() {
-  var Address = require('../address');
+Script.prototype.getAddressInfo = function(opts) {
+  if (this._isInput) {
+    return this._getInputAddressInfo();
+  } else if (this._isOutput) {
+    return this._getOutputAddressInfo();
+  } else {
+    var info = this._getOutputAddressInfo();
+    if (!info) {
+      return this._getInputAddressInfo();
+    }
+    return info;
+  }
+};
+
+/**
+ * Will return the associated output scriptPubKey address information object
+ * @return {Address|boolean}
+ * @private
+ */
+Script.prototype._getOutputAddressInfo = function() {
   var info = {};
   if (this.isScriptHashOut()) {
     info.hashBuffer = this.getData();
@@ -769,7 +780,20 @@ Script.prototype.getAddressInfo = function() {
   } else if (this.isPublicKeyHashOut()) {
     info.hashBuffer = this.getData();
     info.type = Address.PayToPublicKeyHash;
-  } else if (this.isPublicKeyHashIn()) {
+  } else {
+    return false;
+  }
+  return info;
+};
+
+/**
+ * Will return the associated input scriptSig address information object
+ * @return {Address|boolean}
+ * @private
+ */
+Script.prototype._getInputAddressInfo = function() {
+  var info = {};
+  if (this.isPublicKeyHashIn()) {
     // hash the publickey found in the scriptSig
     info.hashBuffer = Hash.sha256ripemd160(this.chunks[1].buf);
     info.type = Address.PayToPublicKeyHash;
@@ -782,18 +806,17 @@ Script.prototype.getAddressInfo = function() {
   }
   return info;
 };
+
 /**
  * @param {Network=} network
  * @return {Address|boolean} the associated address for this script if possible, or false
  */
 Script.prototype.toAddress = function(network) {
-  var Address = require('../address');
-  network = Networks.get(network) || this._network || Networks.defaultNetwork;
   var info = this.getAddressInfo();
   if (!info) {
     return false;
   }
-  info.network = Networks.get(network) || Networks.defaultNetwork;
+  info.network = Networks.get(network) || this._network || Networks.defaultNetwork;
   return new Address(info);
 };
 
diff --git a/lib/transaction/input/input.js b/lib/transaction/input/input.js
index afa169e..d810890 100644
--- a/lib/transaction/input/input.js
+++ b/lib/transaction/input/input.js
@@ -34,6 +34,7 @@ Object.defineProperty(Input.prototype, 'script', {
     }
     if (!this._script) {
       this._script = new Script(this._scriptBuffer);
+      this._script._isInput = true;
     }
     return this._script;
   }
@@ -116,6 +117,7 @@ Input.prototype.setScript = function(script) {
   this._script = null;
   if (script instanceof Script) {
     this._script = script;
+    this._script._isInput = true;
     this._scriptBuffer = script.toBuffer();
   } else if (JSUtil.isHexa(script)) {
     // hex string script
@@ -123,6 +125,7 @@ Input.prototype.setScript = function(script) {
   } else if (_.isString(script)) {
     // human readable string script
     this._script = new Script(script);
+    this._script._isInput = true;
     this._scriptBuffer = this._script.toBuffer();
   } else if (BufferUtil.isBuffer(script)) {
     // buffer script
diff --git a/lib/transaction/output.js b/lib/transaction/output.js
index 684b7d2..62af6b4 100644
--- a/lib/transaction/output.js
+++ b/lib/transaction/output.js
@@ -113,6 +113,7 @@ Output.prototype.setScriptFromBuffer = function(buffer) {
   this._scriptBuffer = buffer;
   try {
     this._script = Script.fromBuffer(this._scriptBuffer);
+    this._script._isOutput = true;
   } catch(e) {
     if (e instanceof errors.Script.InvalidBuffer) {
       this._script = null;
@@ -126,9 +127,11 @@ Output.prototype.setScript = function(script) {
   if (script instanceof Script) {
     this._scriptBuffer = script.toBuffer();
     this._script = script;
+    this._script._isOutput = true;
   } else if (_.isString(script)) {
     this._script = Script.fromString(script);
     this._scriptBuffer = this._script.toBuffer();
+    this._script._isOutput = true;
   } else if (bufferUtil.isBuffer(script)) {
     this.setScriptFromBuffer(script);
   } else {
diff --git a/test/transaction/transaction.js b/test/transaction/transaction.js
index b828ec5..8980969 100644
--- a/test/transaction/transaction.js
+++ b/test/transaction/transaction.js
@@ -202,7 +202,9 @@ describe('Transaction', function() {
       transaction.outputs[1].satoshis.should.equal(40000);
       transaction.outputs[1].script.toString()
         .should.equal(Script.fromAddress(changeAddress).toString());
-      transaction.getChangeOutput().script.should.deep.equal(Script.fromAddress(changeAddress));
+      var actual = transaction.getChangeOutput().script.toString();
+      var expected = Script.fromAddress(changeAddress).toString();
+      actual.should.equal(expected);
     });
     it('accepts a P2SH address for change', function() {
       var transaction = new Transaction()