diff --git a/js/models/PublicKeyRing.js b/js/models/PublicKeyRing.js
new file mode 100644
index 000000000..a078c51f3
--- /dev/null
+++ b/js/models/PublicKeyRing.js
@@ -0,0 +1,231 @@
+
+'use strict';
+
+
+var imports     = require('soop').imports();
+var bitcore     = require('bitcore');
+var BIP32       = bitcore.BIP32;
+var Address     = bitcore.Address;
+var Script      = bitcore.Script;
+var coinUtil    = bitcore.util;
+var Transaction = bitcore.Transaction;
+var buffertools = bitcore.buffertools;
+
+var Storage     = imports.Storage || require('./Storage');
+var log         = imports.log || console.log;
+
+var storage     = Storage.default();
+
+/*
+ * This follow Electrum convetion, as described on
+ * https://bitcointalk.org/index.php?topic=274182.0
+ *
+ * We should probably adapt the next standard once its ready as discussed at:
+ * http://sourceforge.net/p/bitcoin/mailman/message/32148600/
+ *
+ */
+
+var PUBLIC_BRANCH = 'm/0/';
+var CHANGE_BRANCH = 'm/1/';
+
+function PublicKeyRing(opts) {
+  opts = opts || {};
+
+  this.network = opts.network === 'livenet' ? 
+      bitcore.networks.livenet : bitcore.networks.testnet;
+
+  this.requiredCopayers = opts.requiredCopayers || 3;
+  this.totalCopayers = opts.totalCopayers || 5;
+
+  this.id = opts.id || PublicKeyRing.getRandomId();
+
+  this.dirty = 1;
+  this.copayersBIP32 = [];
+
+  this.changeAddressIndex=0;
+  this.addressIndex=0;
+}
+
+
+PublicKeyRing.getRandomId = function () {
+  return buffertools.toHex(coinUtil.generateNonce());
+};
+
+PublicKeyRing.decrypt = function (passphrase, encPayload) {
+  log('[wallet.js.35] TODO READ: passphrase IGNORED');
+  return encPayload;
+};
+
+PublicKeyRing.encrypt = function (passphrase, payload) {
+  log('[wallet.js.92] TODO: passphrase IGNORED');
+  return payload;
+};
+
+PublicKeyRing.read = function (id, passphrase) {
+  var encPayload = storage.read(id);
+  if (!encPayload) 
+    throw new Error('Could not find wallet data');
+  var data;
+  try {
+    data = JSON.parse( PublicKeyRing.decrypt( passphrase, encPayload ));
+  } catch (e) {
+    throw new Error('error in storage: '+ e.toString());
+    return;
+  };
+
+  if (data.id !== id) 
+    throw new Error('Wrong id in data');
+
+  var config = { network: data.network === 'livenet' ? 
+      bitcore.networks.livenet : bitcore.networks.testnet
+  };
+
+  var w = new PublicKeyRing(config);
+
+  w.requiredCopayers = data.neededCopayers;
+  w.totalCopayers = data.totalCopayers;
+
+//  this.bip32 = ;
+  w.copayersBIP32 = data.copayersExtPubKeys.map( function (pk) { 
+    return new BIP32(pk);
+  });
+
+  w.dirty = 0;
+
+  return w;
+};
+
+PublicKeyRing.prototype.serialize = function () {
+  return JSON.stringify({
+    id: this.id,
+    network: this.network.name,
+    requiredCopayers: this.neededCopayers,
+    totalCopayers: this.totalCopayers,
+    copayersExtPubKeys: this.copayersBIP32.map( function (b) { 
+      return b.extendedPublicKeyString(); 
+    }),
+  });
+};
+
+
+PublicKeyRing.prototype.store = function (passphrase) {
+
+  if (!this.id) 
+      throw new Error('wallet has no id');
+
+  storage.save(this.id, PublicKeyRing.encrypt(passphrase,this.serialize()));
+  this.dirty = 0;
+
+  return true;
+};
+
+PublicKeyRing.prototype.registeredCopayers = function () {
+  return this.copayersBIP32.length;
+};
+
+
+
+PublicKeyRing.prototype.haveAllRequiredPubKeys = function () {
+  return this.registeredCopayers() === this.totalCopayers;
+};
+
+PublicKeyRing.prototype._checkKeys = function() {
+
+  if (!this.haveAllRequiredPubKeys())
+      throw new Error('dont have required keys yet');
+};
+
+
+PublicKeyRing.prototype._newExtendedPublicKey = function () {
+  return new BIP32(this.network.name)
+    .extendedPublicKeyString();
+};
+
+PublicKeyRing.prototype.addCopayer = function (newEpk) {
+
+  if (this.haveAllRequiredPubKeys())
+      throw new Error('already have all required key:' + this.totalCopayers);
+
+  if (!newEpk) {
+    newEpk = this._newExtendedPublicKey();
+  }
+
+  this.copayersBIP32.forEach(function(b){
+    if (b.extendedPublicKeyString() === newEpk)
+      throw new Error('already have that key');
+  });
+
+  this.copayersBIP32.push(new BIP32(newEpk));
+  this.dirty = 1;
+  return newEpk;
+};
+
+
+PublicKeyRing.prototype.getCopayersPubKeys = function (index, isChange) {
+  this._checkKeys();
+
+  var pubKeys = [];
+  var l = this.copayersBIP32.length;
+  for(var i=0; i<l; i++) {
+    var path = (isChange ? CHANGE_BRANCH : PUBLIC_BRANCH) + index;
+    var bip32 = this.copayersBIP32[i].derive(path);
+    pubKeys[i] = bip32.eckey.public;
+  }
+
+  return pubKeys;
+};
+
+PublicKeyRing.prototype._checkIndexRange = function (index, isChange) {
+  if ( (isChange && index > this.changeAddressIndex) ||
+      (!isChange && index > this.addressIndex)) {
+    log('Out of bounds at getAddress: Index %d isChange: %d', index, isChange);
+    throw new Error('index out of bound');
+  }
+};
+
+PublicKeyRing.prototype.getRedeemScript = function (index, isChange) {
+  this._checkIndexRange(index, isChange);
+
+  var pubKeys = this.getCopayersPubKeys();
+  var script  = Script.createMultisig(this.requiredCopayers, pubKeys);
+  return script;
+};
+
+PublicKeyRing.prototype.getAddress = function (index, isChange) {
+  this._checkIndexRange(index, isChange);
+
+  var script  = this.getRedeemScript(index,isChange);
+  var hash    = coinUtil.sha256ripe160(script.getBuffer());
+  var version = this.network.addressScript;
+  var addr    = new Address(version, hash);
+  return addr.as('base58');
+};
+
+//generate a new address, update index.
+PublicKeyRing.prototype.generateAddress = function(isChange) {
+
+  var ret =  
+    this.getAddress(isChange ? this.changeAddressIndex : this.addressIndex, isChange);
+  if (isChange) 
+    this.addressIndex++;
+  else 
+    this.changeAddressIndex++;
+
+  return ret;
+
+};
+
+PublicKeyRing.prototype.getAddresses = function() {
+  var ret = [];
+
+  for (var i=0; i<this.changeAddressIndex; i++) {
+    ret.push(this.getAddress(i,true));
+  }
+
+  for (var i=0; i<this.addressIndex; i++) {
+    ret.push(this.getAddress(i,false));
+  }
+  return ret;
+};
+
+module.exports = require('soop')(PublicKeyRing);
diff --git a/test/FakeStorage.js b/test/FakeStorage.js
new file mode 100644
index 000000000..164b526ba
--- /dev/null
+++ b/test/FakeStorage.js
@@ -0,0 +1,14 @@
+
+var FakeStorage = function(){
+  this.storage = {};
+}; 
+
+FakeStorage.prototype.read = function (id) {
+  return this.storage[id];
+};
+
+FakeStorage.prototype.save = function(id, payload) {
+  this.storage[id] = payload;
+}
+
+module.exports = require('soop')(FakeStorage);
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.publickeyring.js b/test/test.publickeyring.js
new file mode 100644
index 000000000..38c992905
--- /dev/null
+++ b/test/test.publickeyring.js
@@ -0,0 +1,130 @@
+'use strict';
+
+var chai           = chai || require('chai');
+var should         = chai.should();
+var bitcore        = bitcore || require('../node_modules/bitcore');
+var Address        = bitcore.Address;
+var buffertools    = bitcore.buffertools;
+var copay          = copay || {};
+var fakeStorage    = require('./FakeStorage');
+var PublicKeyRing  = copay.PublicKeyRing || require('soop').load('../js/models/PublicKeyRing', {Storage: fakeStorage});
+
+var aMasterPubKey = 'tprv8ZgxMBicQKsPdSVTiWXEqCCzqRaRr9EAQdn5UVMpT9UHX67Dh1FmzEMbavPumpAicsUm2XvC6NTdcWB89yN5DUWx5HQ7z3KByUg7Ht74VRZ';
+
+
+var config = {
+  network:'livenet',
+};
+
+var createW = function (network) {
+
+  var config = {
+    network: network || 'livenet',
+  };
+
+  var w = new PublicKeyRing(config);
+  should.exist(w);
+
+  var copayers = [];
+  for(var i=0; i<5; i++) {
+    w.haveAllRequiredPubKeys().should.equal(false);
+    var newEpk = w.addCopayer();
+    copayers.push(newEpk);
+  }
+  
+  return {w:w, copayers: copayers};
+};
+
+describe('PublicKeyRing model', function() {
+
+  it('should create an instance (livenet)', function () {
+    var w = new PublicKeyRing({
+      network: config.network
+    });
+    should.exist(w);
+    w.network.name.should.equal('livenet');
+  });
+  it('should create an instance (testnet)', function () {
+    var w2 = new PublicKeyRing();
+    should.exist(w2);
+    w2.network.name.should.equal('testnet');
+  });
+
+  it('should fail to generate shared pub keys wo extended key', function () {
+    var w2 = new PublicKeyRing(config);
+    should.exist(w2);
+
+    w2.registeredCopayers().should.equal(0); 
+    w2.haveAllRequiredPubKeys().should.equal(false);
+
+    w2.getAddress.bind(false).should.throw();
+  });
+
+  it('should add and check when adding shared pub keys', function () {
+    var k = createW();
+    var w = k.w;
+    var copayers = k.copayers;
+
+    w.haveAllRequiredPubKeys().should.equal(true);
+    w.addCopayer.bind().should.throw();
+    for(var i =0; i<5; i++) 
+      w.addCopayer.bind(copayers[i]).should.throw();
+  });
+
+  it('show be able to store and retrieve', function () {
+    var k = createW();
+    var w = k.w;
+    var copayers = k.copayers;
+
+    w.store().should.equal(true);
+    var ID = w.id;
+    delete w['id'];
+    w.store.bind().should.throw();
+
+    var w2 = PublicKeyRing.read(ID);
+    w2.haveAllRequiredPubKeys().should.equal(true);
+    w2.addCopayer.bind().should.throw();
+    for(var i =0; i<5; i++) 
+      w2.addCopayer.bind(copayers[i]).should.throw();
+ 
+  });
+
+
+  it('should generate some p2sh addresses', function () {
+    var k = createW();
+    var w = k.w;
+
+    for(var isChange=0; isChange<2; isChange++) {
+      for(var i=0; i<5; i++) {
+        var addr = w.generateAddress(isChange);
+        var a = new Address(addr);
+        a.isValid().should.equal(true);
+        a.isScript().should.equal(true);
+        a.network().name.should.equal('livenet');
+      }
+    }
+  });
+
+  it('should return PublicKeyRing addresses', function () {
+    var k = createW();
+    var w = k.w;
+
+
+    var a = w.getAddresses();
+    a.length.should.equal(0);
+
+    for(var isChange=0; isChange<2; isChange++) 
+      for(var i=0; i<6; i++) 
+         w.generateAddress(isChange);
+ 
+    var as = w.getAddresses();
+    as.length.should.equal(12);
+    for(var i in as) {
+      var a = new Address(as[i]);
+      a.isValid().should.equal(true);
+    }
+  });
+
+});
+
+