diff --git a/js/models/wallet.js b/js/models/wallet.js
new file mode 100644
index 000000000..02714fb1c
--- /dev/null
+++ b/js/models/wallet.js
@@ -0,0 +1,95 @@
+'use strict';
+var imports = require('soop').imports();
+var bitcore = require('bitcore');
+var BIP32   = bitcore.BIP32;
+
+var Storage = imports.Storage || require('./Storage');
+
+/*
+ * This follow Electrum convetion, as described on
+ * https://bitcointalk.org/index.php?topic=274182.0
+ */
+
+var PUBLIC_BRANCH = 'm/0/';
+var CHANGE_BRANCH = 'm/1/';
+
+function Wallet(opts) {
+  opts = opts || {};
+
+  this.network = opts.network === 'livenet' ? 
+      bitcore.networks.livenet : bitcore.networks.testnet;
+
+  this.neededCosigners = opts.neededCosigners || 3;
+  this.totalCosigners = opts.totalCosigners || 5;
+
+  this.dirty = 1;
+  this.cosignersBIP = [];
+  this.bip32 = new BIP32(opts.bytes ||  this.network.name);
+}
+
+
+
+Wallet.read = function (BIP38password) {
+};
+
+Wallet.prototype.registeredCosigners = function () {
+
+  // 1 is self.
+  return 1 + this.cosignersBIP.length;
+};
+
+Wallet.prototype.getExtendedPrivKey = function (BIP38password) {
+  if (!this.bip32) 
+      throw new Error('no priv key defined on the wallet');
+
+  return this.bip32.extended_private_key_string();
+};
+
+
+Wallet.prototype.getExtendedPubKey = function () {
+  return this.bip32.extended_public_key_string();
+};
+
+
+//  should receive an array also?
+Wallet.prototype.addCosignerExtendedPubKey = function (newEpk) {
+
+  if (this.haveAllNeededPubKeys())
+      throw new Error('already have all needed key:' + this.totalCosigners);
+
+  if (this.getExtendedPubKey() === newEpk)
+    throw new Error('already have that key (self kehy)');
+
+
+  this.cosignersBIP.forEach(function(b){
+    if (b.getExtendedPubKey() === newEpk)
+      throw new Error('already have that key');
+  });
+
+  this.cosignersBIP.push(new Wallet({bytes:newEpk, network: this.network.name } ));
+};
+
+
+Wallet.prototype.haveAllNeededPubKeys = function () {
+  return this.registeredCosigners() === this.totalCosigners;
+};
+
+
+Wallet.prototype.getChangeAddress = function (index) {
+
+  //index can be 0, 1, 2, etc.
+  if (! this.haveAllNeededPubKeys() ) 
+      throw new Error('cosigners pub key missing');
+};
+
+
+Wallet.prototype.store = function () {
+};
+
+
+// Input: Bitcore's Transaction, sign with ownPK
+// return partially signed or fully signed tx
+Wallet.prototype.signTx = function (tx, BIP38password) {
+};
+
+module.exports = require('soop')(Wallet);
diff --git a/package.json b/package.json
index bac19d810..7d2565c1e 100644
--- a/package.json
+++ b/package.json
@@ -18,11 +18,16 @@
     "url": "https://github.com/bitpay/cosign/issues"
   },
   "homepage": "https://github.com/bitpay/cosign",
+  "dependencies": {
+    "bitcore": "0.1.8",
+    "soop": "0.1.5"
+  },
   "devDependencies": {
     "grunt-cli": "~0.1.13",
     "karma": "~0.12.1",
     "karma-chrome-launcher": "~0.1.2",
     "mocha": "~1.18.2",
-    "karma-mocha": "~0.1.3"
+    "karma-mocha": "~0.1.3",
+    "chai": "~1.9.0"
   }
 }
diff --git a/test/mocha.opts b/test/mocha.opts
new file mode 100644
index 000000000..ec648f252
--- /dev/null
+++ b/test/mocha.opts
@@ -0,0 +1 @@
+-R spec
diff --git a/test/test.wallet.js b/test/test.wallet.js
new file mode 100644
index 000000000..5834860e4
--- /dev/null
+++ b/test/test.wallet.js
@@ -0,0 +1,84 @@
+'use strict';
+
+var chai = chai || require('chai');
+var should  = chai.should();
+var bitcore = bitcore || require('../node_modules/bitcore');
+
+var cosign = cosign || {};
+
+var fakeStorage = {}; // TODO
+
+var Wallet = cosign.Wallet || require('soop').load('../js/models/Wallet', {Storage: fakeStorage});
+ 
+
+var config = {
+  network:'livenet',
+};
+
+describe('Wallet model', function() {
+
+  it('should create an instance (livenet)', function () {
+    var w = new Wallet({
+      network: config.network
+    });
+    should.exist(w);
+    w.network.name.should.equal('livenet');
+  });
+  it('should create an instance (testnet)', function () {
+    var w2 = new Wallet();
+    should.exist(w2);
+    w2.network.name.should.equal('testnet');
+  });
+
+  it('should throw  master priv key', function () {
+    var w2 = new Wallet(config);
+    should.exist(w2);
+
+    w2.getExtendedPrivKey.bind().should.throw();
+  });
+
+
+  it('should create an master priv key', function () {
+    var w2 = new Wallet(config);
+    should.exist(w2);
+    should.exist(w2.getExtendedPrivKey());
+  });
+
+
+  it('should create an master pub key', function () {
+    var w2 = new Wallet(config);
+    should.exist(w2);
+    should.exist(w2.getExtendedPubKey());
+  });
+
+  it('should fail to generate shared pub keys', function () {
+    var w2 = new Wallet(config);
+    should.exist(w2);
+    w2.getChangeAddress.bind(0).should.throw();
+
+    w2.registeredCosigners().should.equal(1); 
+    w2.haveAllNeededPubKeys().should.equal(false);
+  });
+
+  it('should add and check when adding shared pub keys', function () {
+    var w = new Wallet(config);
+    should.exist(w);
+
+    var cosigners = [];
+    for(var i=0; i<4; i++) {
+      var c = new Wallet(config);
+      w.haveAllNeededPubKeys().should.equal(false);
+
+      w.addCosignerExtendedPubKey(c.getExtendedPubKey());
+      cosigners.push(c);
+    }
+    w.haveAllNeededPubKeys().should.equal(true);
+    w.addCosignerExtendedPubKey.bind(w.getExtendedPubKey()).should.throw();
+    w.addCosignerExtendedPubKey.bind(cosigners[0].getExtendedPubKey()).should.throw();
+    w.addCosignerExtendedPubKey.bind((new Wallet(config)).getExtendedPubKey()).should.throw();
+  });
+
+
+});
+
+