diff --git a/lib/model/index.js b/lib/model/index.js
new file mode 100644
index 0000000..7d1c5d8
--- /dev/null
+++ b/lib/model/index.js
@@ -0,0 +1,5 @@
+var Model = {};
+
+Model.Wallet = require('./wallet');
+
+module.exports = Model;
diff --git a/lib/storage_mongo.js b/lib/storage_mongo.js
new file mode 100644
index 0000000..1e3ec37
--- /dev/null
+++ b/lib/storage_mongo.js
@@ -0,0 +1,390 @@
+'use strict';
+
+var _ = require('lodash');
+var levelup = require('mongodb');
+var async = require('async');
+var $ = require('preconditions').singleton();
+var log = require('npmlog');
+log.debug = log.verbose;
+log.disableColor();
+var util = require('util');
+
+var mongodb = require('mongodb');
+
+var Wallet = require('./model/wallet');
+var Copayer = require('./model/copayer');
+var Address = require('./model/address');
+var TxProposal = require('./model/txproposal');
+var Notification = require('./model/notification');
+
+var Storage = function(opts) {
+  opts = opts || {};
+  this.db = opts.db;
+
+  if (!this.db) {
+    var url = 'mongodb://localhost:27017/bws';
+    mongodb.MongoClient.connect(url, function(err, db) {
+      if (err) {
+        log.error('Unable to connect to the mongoDB server. Error:', err);
+        return;
+      }
+      this.db = db;
+      console.log('Connection established to ', url);
+    });
+  }
+};
+
+var zeroPad = function(x, length) {
+  return _.padLeft(parseInt(x), length, '0');
+};
+
+var walletPrefix = function(id) {
+  return 'w!' + id;
+};
+
+var opKey = function(key) {
+  return key ? '!' + key : '';
+};
+
+var MAX_TS = _.repeat('9', 14);
+
+
+var KEY = {
+  WALLET: function(walletId) {
+    return walletPrefix(walletId) + '!main';
+  },
+  COPAYER: function(id) {
+    return 'copayer!' + id;
+  },
+  TXP: function(walletId, txProposalId) {
+    return walletPrefix(walletId) + '!txp' + opKey(txProposalId);
+  },
+  NOTIFICATION: function(walletId, notificationId) {
+    return walletPrefix(walletId) + '!not' + opKey(notificationId);
+  },
+  PENDING_TXP: function(walletId, txProposalId) {
+    return walletPrefix(walletId) + '!ptxp' + opKey(txProposalId);
+  },
+  ADDRESS: function(walletId, address) {
+    return walletPrefix(walletId) + '!addr' + opKey(address);
+  },
+};
+
+Storage.prototype.fetchWallet = function(id, cb) {
+  this.db.get(KEY.WALLET(id), function(err, data) {
+    if (err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    }
+    return cb(null, Wallet.fromObj(data));
+  });
+};
+
+Storage.prototype.storeWallet = function(wallet, cb) {
+  this.db.put(KEY.WALLET(wallet.id), wallet, cb);
+};
+
+Storage.prototype.storeWalletAndUpdateCopayersLookup = function(wallet, cb) {
+  var ops = [];
+  ops.push({
+    type: 'put',
+    key: KEY.WALLET(wallet.id),
+    value: wallet
+  });
+  _.each(wallet.copayers, function(copayer) {
+    var value = {
+      walletId: wallet.id,
+      requestPubKey: copayer.requestPubKey,
+    };
+    ops.push({
+      type: 'put',
+      key: KEY.COPAYER(copayer.id),
+      value: value
+    });
+  });
+  this.db.batch(ops, cb);
+};
+
+Storage.prototype.fetchCopayerLookup = function(copayerId, cb) {
+  this.db.get(KEY.COPAYER(copayerId), function(err, data) {
+    if (err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    }
+    return cb(null, data);
+  });
+};
+
+Storage.prototype._completeTxData = function(walletId, txs, cb) {
+  var txList = [].concat(txs);
+  this.fetchWallet(walletId, function(err, wallet) {
+    if (err) return cb(err);
+    _.each(txList, function(tx) {
+      tx.creatorName = wallet.getCopayer(tx.creatorId).name;
+      _.each(tx.actions, function(action) {
+        action.copayerName = wallet.getCopayer(action.copayerId).name;
+      });
+    });
+    return cb(null, txs);
+  });
+};
+
+Storage.prototype.fetchTx = function(walletId, txProposalId, cb) {
+  var self = this;
+  this.db.get(KEY.TXP(walletId, txProposalId), function(err, data) {
+    if (err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    }
+    return self._completeTxData(walletId, TxProposal.fromObj(data), cb);
+  });
+};
+
+
+Storage.prototype.fetchPendingTxs = function(walletId, cb) {
+  var self = this;
+
+  var txs = [];
+  var key = KEY.PENDING_TXP(walletId);
+  this.db.createReadStream({
+    gte: key,
+    lt: key + '~'
+  })
+    .on('data', function(data) {
+      txs.push(TxProposal.fromObj(data.value));
+    })
+    .on('error', function(err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    })
+    .on('end', function() {
+      return self._completeTxData(walletId, txs, cb);
+    });
+};
+
+/**
+ * fetchTxs. Times are in UNIX EPOCH (seconds)
+ *
+ * @param walletId
+ * @param opts.minTs
+ * @param opts.maxTs
+ * @param opts.limit
+ */
+Storage.prototype.fetchTxs = function(walletId, opts, cb) {
+  var self = this;
+
+  var txs = [];
+  opts = opts || {};
+  opts.limit = _.isNumber(opts.limit) ? parseInt(opts.limit) : -1;
+  opts.minTs = _.isNumber(opts.minTs) ? zeroPad(opts.minTs, 11) : 0;
+  opts.maxTs = _.isNumber(opts.maxTs) ? zeroPad(opts.maxTs, 11) : MAX_TS;
+
+  var key = KEY.TXP(walletId, opts.minTs);
+  var endkey = KEY.TXP(walletId, opts.maxTs);
+
+  this.db.createReadStream({
+    gt: key,
+    lt: endkey + '~',
+    reverse: true,
+    limit: opts.limit,
+  })
+    .on('data', function(data) {
+      txs.push(TxProposal.fromObj(data.value));
+    })
+    .on('error', function(err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    })
+    .on('end', function() {
+      return self._completeTxData(walletId, txs, cb);
+    });
+};
+
+
+/**
+ * fetchNotifications
+ *
+ * @param walletId
+ * @param opts.minTs
+ * @param opts.maxTs
+ * @param opts.limit
+ */
+Storage.prototype.fetchNotifications = function(walletId, opts, cb) {
+  var txs = [];
+  opts = opts || {};
+  opts.limit = _.isNumber(opts.limit) ? parseInt(opts.limit) : -1;
+  opts.minTs = _.isNumber(opts.minTs) ? zeroPad(opts.minTs, 11) : 0;
+  opts.maxTs = _.isNumber(opts.maxTs) ? zeroPad(opts.maxTs, 11) : MAX_TS;
+
+  var key = KEY.NOTIFICATION(walletId, opts.minTs);
+  var endkey = KEY.NOTIFICATION(walletId, opts.maxTs);
+
+  this.db.createReadStream({
+    gt: key,
+    lt: endkey + '~',
+    reverse: opts.reverse,
+    limit: opts.limit,
+  })
+    .on('data', function(data) {
+      txs.push(Notification.fromObj(data.value));
+    })
+    .on('error', function(err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    })
+    .on('end', function() {
+      return cb(null, txs);
+    });
+};
+
+
+Storage.prototype.storeNotification = function(walletId, notification, cb) {
+  this.db.put(KEY.NOTIFICATION(walletId, notification.id), notification, cb);
+};
+
+
+// TODO should we store only txp.id on keys for indexing
+// or the whole txp? For now, the entire record makes sense
+// (faster + easier to access)
+Storage.prototype.storeTx = function(walletId, txp, cb) {
+  var ops = [{
+    type: 'put',
+    key: KEY.TXP(walletId, txp.id),
+    value: txp,
+  }];
+
+  if (txp.isPending()) {
+    ops.push({
+      type: 'put',
+      key: KEY.PENDING_TXP(walletId, txp.id),
+      value: txp,
+    });
+  } else {
+    ops.push({
+      type: 'del',
+      key: KEY.PENDING_TXP(walletId, txp.id),
+    });
+  }
+  this.db.batch(ops, cb);
+};
+
+Storage.prototype.removeTx = function(walletId, txProposalId, cb) {
+  var ops = [{
+    type: 'del',
+    key: KEY.TXP(walletId, txProposalId),
+  }, {
+    type: 'del',
+    key: KEY.PENDING_TXP(walletId, txProposalId),
+  }];
+
+  this.db.batch(ops, cb);
+};
+
+Storage.prototype._delByKey = function(key, cb) {
+  var self = this;
+  var keys = [];
+  this.db.createKeyStream({
+    gte: key,
+    lt: key + '~',
+  })
+    .on('data', function(key) {
+      keys.push(key);
+    })
+    .on('error', function(err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    })
+    .on('end', function(err) {
+      self.db.batch(_.map(keys, function(k) {
+        return {
+          key: k,
+          type: 'del'
+        };
+      }), function(err) {
+        return cb(err);
+      });
+    });
+};
+
+Storage.prototype._removeCopayers = function(walletId, cb) {
+  var self = this;
+
+  this.fetchWallet(walletId, function(err, w) {
+    if (err || !w) return cb(err);
+
+    self.db.batch(_.map(w.copayers, function(c) {
+      return {
+        type: 'del',
+        key: KEY.COPAYER(c.id),
+      };
+    }), cb);
+  });
+};
+
+Storage.prototype.removeWallet = function(walletId, cb) {
+  var self = this;
+
+  async.series([
+
+    function(next) {
+      // This should be the first step. Will check the wallet exists
+      self._removeCopayers(walletId, next);
+    },
+    function(next) {
+      self._delByKey(walletPrefix(walletId), cb);
+    },
+  ], cb);
+};
+
+
+Storage.prototype.fetchAddresses = function(walletId, cb) {
+  var addresses = [];
+  var key = KEY.ADDRESS(walletId);
+  this.db.createReadStream({
+    gte: key,
+    lt: key + '~'
+  })
+    .on('data', function(data) {
+      addresses.push(Address.fromObj(data.value));
+    })
+    .on('error', function(err) {
+      if (err.notFound) return cb();
+      return cb(err);
+    })
+    .on('end', function() {
+      return cb(null, addresses);
+    });
+};
+
+Storage.prototype.storeAddressAndWallet = function(wallet, addresses, cb) {
+  var ops = _.map([].concat(addresses), function(address) {
+    return {
+      type: 'put',
+      key: KEY.ADDRESS(wallet.id, address.address),
+      value: address,
+    };
+  });
+  ops.unshift({
+    type: 'put',
+    key: KEY.WALLET(wallet.id),
+    value: wallet,
+  });
+
+  this.db.batch(ops, cb);
+};
+
+Storage.prototype._dump = function(cb, fn) {
+  fn = fn || console.log;
+
+  this.db.readStream()
+    .on('data', function(data) {
+      fn(util.inspect(data, {
+        depth: 10
+      }));
+    })
+    .on('end', function() {
+      if (cb) return cb();
+    });
+};
+
+module.exports = Storage;
diff --git a/test/storage.js b/test/storage.js
new file mode 100644
index 0000000..0378d61
--- /dev/null
+++ b/test/storage.js
@@ -0,0 +1,54 @@
+'use strict';
+
+var _ = require('lodash');
+var chai = require('chai');
+var sinon = require('sinon');
+var should = chai.should();
+var levelup = require('levelup');
+var memdown = require('memdown');
+var Storage = require('../lib/storage');
+
+var Model = require('../lib/model');
+
+
+describe.only('Storage', function() {
+  var storage;
+  beforeEach(function() {
+    var db = levelup(memdown, {
+      valueEncoding: 'json'
+    });
+    storage = new Storage({
+      db: db
+    });
+  });
+  describe('Store & fetch wallet', function() {
+    it('should correctly store and fetch wallet', function(done) {
+      var wallet = Model.Wallet.create({
+        id: '123',
+        name: 'my wallet',
+        m: 2,
+        n: 3,
+      });
+      should.exist(wallet);
+      storage.storeWallet(wallet, function(err) {
+        should.not.exist(err);
+        storage.fetchWallet('123', function(err, w) {
+          should.not.exist(err);
+          should.exist(w);
+          w.id.should.equal(wallet.id);
+          w.name.should.equal(wallet.name);
+          w.m.should.equal(wallet.m);
+          w.n.should.equal(wallet.n);
+          done();
+        })
+      });
+    });
+    it('should not return error if wallet not found', function(done) {
+      storage.fetchWallet('123', function(err, w) {
+        should.not.exist(err);
+        should.not.exist(w);
+        done();
+      });
+    });
+  });
+});