diff --git a/lib/model/address.js b/lib/model/address.js
index ac95374..93b6fd9 100644
--- a/lib/model/address.js
+++ b/lib/model/address.js
@@ -2,15 +2,14 @@
 
 var Bitcore = require('bitcore-wallet-utils').Bitcore;
 
-function Address() {
-  this.version = '1.0.0';
-};
+function Address() {};
 
 Address.create = function(opts) {
   opts = opts || {};
 
   var x = new Address();
 
+  x.version = '1.0.0';
   x.createdOn = Math.floor(Date.now() / 1000);
   x.address = opts.address;
   x.walletId = opts.walletId;
@@ -24,6 +23,7 @@ Address.create = function(opts) {
 Address.fromObj = function(obj) {
   var x = new Address();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.address = obj.address;
   x.walletId = obj.walletId;
diff --git a/lib/model/addressmanager.js b/lib/model/addressmanager.js
index 6d9d66f..058b7fb 100644
--- a/lib/model/addressmanager.js
+++ b/lib/model/addressmanager.js
@@ -2,15 +2,14 @@ var _ = require('lodash');
 
 var SHARED_INDEX = 0x80000000 - 1;
 
-function AddressManager() {
-  this.version = '1.0.0';
-};
+function AddressManager() {};
 
 AddressManager.create = function(opts) {
   opts = opts || {};
 
   var x = new AddressManager();
 
+  x.version = '1.0.0';
   x.receiveAddressIndex = 0;
   x.changeAddressIndex = 0;
   x.copayerIndex = (opts && _.isNumber(opts.copayerIndex)) ? opts.copayerIndex : SHARED_INDEX;
@@ -22,6 +21,7 @@ AddressManager.create = function(opts) {
 AddressManager.fromObj = function(obj) {
   var x = new AddressManager();
 
+  x.version = obj.version;
   x.receiveAddressIndex = obj.receiveAddressIndex;
   x.changeAddressIndex = obj.changeAddressIndex;
   x.copayerIndex = obj.copayerIndex;
diff --git a/lib/model/copayer.js b/lib/model/copayer.js
index db9eef7..bccdc81 100644
--- a/lib/model/copayer.js
+++ b/lib/model/copayer.js
@@ -12,13 +12,7 @@ var WalletUtils = require('bitcore-wallet-utils');
 var Bitcore = WalletUtils.Bitcore;
 var HDPublicKey = Bitcore.HDPublicKey;
 
-function Copayer() {
-  this.version = '2';
-};
-
-Copayer.getVersion = function() {
-  return parseInt(this.version);
-};
+function Copayer() {};
 
 Copayer.create = function(opts) {
   opts = opts || {};
@@ -29,16 +23,14 @@ Copayer.create = function(opts) {
   opts.copayerIndex = opts.copayerIndex || 0;
 
   var x = new Copayer();
-  x.createdOn = Math.floor(Date.now() / 1000);
 
+  x.version = 2;
+  x.createdOn = Math.floor(Date.now() / 1000);
   x.xPubKey = opts.xPubKey;
-
   x.id = WalletUtils.xPubToCopayerId(x.xPubKey);
   x.name = opts.name;
-
   x.requestPubKey = opts.requestPubKey;
   x.signature = opts.signature;
-
   x.requestPubKeys = [{
     key: opts.requestPubKey,
     signature: opts.signature,
@@ -56,15 +48,15 @@ Copayer.create = function(opts) {
 Copayer.fromObj = function(obj) {
   var x = new Copayer();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;
   x.name = obj.name;
   x.xPubKey = obj.xPubKey;
-
   x.requestPubKey = obj.requestPubKey;
   x.signature = obj.signature;
 
-  if (this.getVersion() == 1) {
+  if (parseInt(x.version) == 1) {
     x.requestPubKeys = [{
       key: x.requestPubKey,
       signature: x.signature,
diff --git a/lib/model/email.js b/lib/model/email.js
index 5b169b9..1d9dadb 100644
--- a/lib/model/email.js
+++ b/lib/model/email.js
@@ -3,15 +3,14 @@
 var _ = require('lodash');
 var Uuid = require('uuid');
 
-function Email() {
-  this.version = '1.0.1';
-};
+function Email() {};
 
 Email.create = function(opts) {
   opts = opts || {};
 
   var x = new Email();
 
+  x.version = 2;
   var now = Date.now();
   x.createdOn = Math.floor(now / 1000);
   x.id = _.padLeft(now, 14, '0') + Uuid.v4();
@@ -33,6 +32,7 @@ Email.create = function(opts) {
 Email.fromObj = function(obj) {
   var x = new Email();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;
   x.walletId = obj.walletId;
@@ -40,8 +40,9 @@ Email.fromObj = function(obj) {
   x.from = obj.from;
   x.to = obj.to;
   x.subject = obj.subject;
-  if (obj.version == '1.0.0') {
+  if (parseInt(x.version) == 1) {
     x.bodyPlain = obj.body;
+    x.version = 2;
   } else {
     x.bodyPlain = obj.bodyPlain;
   }
diff --git a/lib/model/notification.js b/lib/model/notification.js
index 143aced..13c29f2 100644
--- a/lib/model/notification.js
+++ b/lib/model/notification.js
@@ -23,15 +23,14 @@ var Uuid = require('uuid');
  * to notify the user
  *
  */
-function Notification() {
-  this.version = '1.0.0';
-};
+function Notification() {};
 
 Notification.create = function(opts) {
   opts = opts || {};
 
   var x = new Notification();
 
+  x.version = '1.0.0';
   var now = Date.now();
   x.createdOn = Math.floor(now / 1000);
   x.id = _.padLeft(now, 14, '0') + _.padLeft(opts.ticker || 0, 4, '0');
@@ -46,6 +45,7 @@ Notification.create = function(opts) {
 Notification.fromObj = function(obj) {
   var x = new Notification();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;
   x.type = obj.type,
diff --git a/lib/model/preferences.js b/lib/model/preferences.js
index 353c858..9a4451d 100644
--- a/lib/model/preferences.js
+++ b/lib/model/preferences.js
@@ -1,14 +1,13 @@
 'use strict';
 
-function Preferences() {
-  this.version = '1.0.0';
-};
+function Preferences() {};
 
 Preferences.create = function(opts) {
   opts = opts || {};
 
   var x = new Preferences();
 
+  x.version = '1.0.0';
   x.createdOn = Math.floor(Date.now() / 1000);
   x.walletId = opts.walletId;
   x.copayerId = opts.copayerId;
@@ -21,6 +20,7 @@ Preferences.create = function(opts) {
 Preferences.fromObj = function(obj) {
   var x = new Preferences();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.walletId = obj.walletId;
   x.copayerId = obj.copayerId;
diff --git a/lib/model/txproposal.js b/lib/model/txproposal.js
index 042ee87..317d0e6 100644
--- a/lib/model/txproposal.js
+++ b/lib/model/txproposal.js
@@ -8,9 +8,7 @@ var Address = Bitcore.Address;
 
 var TxProposalAction = require('./txproposalaction');
 
-function TxProposal() {
-  this.version = '2.0.0';
-};
+function TxProposal() {};
 
 TxProposal.Types = {
   SIMPLE: 'simple',
@@ -49,6 +47,7 @@ TxProposal.create = function(opts) {
 
   var x = new TxProposal();
 
+  x.version = '2.0.0';
   x.type = opts.type || TxProposal.Types.SIMPLE;
 
   var now = Date.now();
@@ -83,12 +82,12 @@ TxProposal.create = function(opts) {
 TxProposal.fromObj = function(obj) {
   var x = new TxProposal();
 
-  if (obj.version == '1.0.0') {
+  x.version = obj.version;
+  if (obj.version === '1.0.0') {
     x.type = TxProposal.Types.SIMPLE;
   } else {
     x.type = obj.type;
   }
-  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;
   x.walletId = obj.walletId;
diff --git a/lib/model/txproposalaction.js b/lib/model/txproposalaction.js
index 03047c9..bbe090f 100644
--- a/lib/model/txproposalaction.js
+++ b/lib/model/txproposalaction.js
@@ -1,14 +1,13 @@
 'use strict';
 
-function TxProposalAction() {
-  this.version = '1.0.0';
-};
+function TxProposalAction() {};
 
 TxProposalAction.create = function(opts) {
   opts = opts || {};
 
   var x = new TxProposalAction();
 
+  x.version = '1.0.0';
   x.createdOn = Math.floor(Date.now() / 1000);
   x.copayerId = opts.copayerId;
   x.type = opts.type;
@@ -22,6 +21,7 @@ TxProposalAction.create = function(opts) {
 TxProposalAction.fromObj = function(obj) {
   var x = new TxProposalAction();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.copayerId = obj.copayerId;
   x.type = obj.type;
diff --git a/lib/model/wallet.js b/lib/model/wallet.js
index 30beadb..3fc507c 100644
--- a/lib/model/wallet.js
+++ b/lib/model/wallet.js
@@ -10,15 +10,14 @@ var Copayer = require('./copayer');
 var AddressManager = require('./addressmanager');
 var WalletUtils = require('bitcore-wallet-utils');
 
-function Wallet() {
-  this.version = '1.0.0';
-};
+function Wallet() {};
 
 Wallet.create = function(opts) {
   opts = opts || {};
 
   var x = new Wallet();
 
+  x.version = '1.0.0';
   x.createdOn = Math.floor(Date.now() / 1000);
   x.id = opts.id || Uuid.v4();
   x.name = opts.name;
@@ -39,6 +38,7 @@ Wallet.create = function(opts) {
 Wallet.fromObj = function(obj) {
   var x = new Wallet();
 
+  x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;
   x.name = obj.name;
diff --git a/test/models/copayer.js b/test/models/copayer.js
index ab7cdfe..0a2c457 100644
--- a/test/models/copayer.js
+++ b/test/models/copayer.js
@@ -20,6 +20,8 @@ describe('Copayer', function() {
     it('create an address', function() {
       var w = Wallet.fromObj(testWallet);
       var c = Copayer.fromObj(testWallet.copayers[2]);
+      should.exist(c.requestPubKeys);
+      c.requestPubKeys.length.should.equal(1);
       var a1 = c.createAddress(w, true);
       a1.address.should.equal('3AXmDe2FkWY9g5LpRaTs1U7pXKtkNm3NBf');
       a1.path.should.equal('m/2/1/0');