diff --git a/karma.conf.js b/karma.conf.js
index d9b224d28..ebbeacaed 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -79,6 +79,7 @@ module.exports = function(karma) {
       'tests/transaction_spec.js.coffee',          //(OK)
       'tests/transaction_spend_spec.js.coffee',    //(OK)
       'tests/wallet_spec.js.coffee',               //(PARTIAL)
+      'tests/wallet_store_spec.js.coffee',
       'tests/bip38_spec.js.coffee',                //(OK)
       'tests/address_spec.js.coffee',
       'tests/keychain_spec.js.coffee',
diff --git a/src/transaction-list.js b/src/transaction-list.js
index 10fc3ac35..706b8cc65 100644
--- a/src/transaction-list.js
+++ b/src/transaction-list.js
@@ -57,13 +57,17 @@ TransactionList.prototype.fetchTxs = function (amount) {
 };
 
 TransactionList.prototype.pushTxs = function (txs) {
-  txs = Helpers.toArrayFormat(txs).map(Tx.factory);
+  txs = Helpers.toArrayFormat(txs).map(Tx.factory).filter(function (tx) {
+    return !this.transaction(tx.hash);
+  }.bind(this));
   this._transactions = this._transactions.concat(txs);
   this._events.emit('update');
 };
 
 TransactionList.prototype.shiftTxs = function (txs) {
-  txs = Helpers.toArrayFormat(txs).map(Tx.factory);
+  txs = Helpers.toArrayFormat(txs).map(Tx.factory).filter(function (tx) {
+    return !this.transaction(tx.hash);
+  }.bind(this));
   this._transactions = txs.concat(this._transactions);
   this._events.emit('update');
 };
diff --git a/src/wallet-store.js b/src/wallet-store.js
index 035003526..33ebb02c6 100644
--- a/src/wallet-store.js
+++ b/src/wallet-store.js
@@ -101,6 +101,9 @@ var WalletStore = (function() {
     getCurrencies: function() {
       return currencyCodeToCurrency;
     },
+    getTransaction: function(hash) {
+      return transactions.filter(function(tx){return tx.hash === hash})[0]
+    },
     getTransactions: function() {
       return transactions;
     },
diff --git a/tests/blockchain_wallet_spec.js.coffee b/tests/blockchain_wallet_spec.js.coffee
index b635d1958..0a5be56c1 100644
--- a/tests/blockchain_wallet_spec.js.coffee
+++ b/tests/blockchain_wallet_spec.js.coffee
@@ -3,6 +3,7 @@ MyWallet   = undefined
 Address    = undefined
 Wallet     = undefined
 HDWallet   = undefined
+WalletStore = undefined
 
 describe "HDWallet", ->
   wallet = undefined
@@ -77,11 +78,21 @@ describe "HDWallet", ->
       isInstanceOf: (candidate, theClass) ->
         candidate.label != undefined || typeof(candidate) == "object"
 
+    walletStoreTxs = []
+    WalletStore = {
+      pushTransaction: (tx)  -> walletStoreTxs.push(tx)
+      getTransactions: ()    -> walletStoreTxs
+      getTransaction: (hash) -> walletStoreTxs.filter(
+        (tx) -> tx.hash == hash
+      )[0]
+    }
+
     stubs = {
       './wallet'  : MyWallet,
       './address' : Address,
       './helpers' : Helpers,
-      './hd-wallet': HDWallet
+      './hd-wallet': HDWallet,
+      './wallet-store' : WalletStore
     }
     Wallet = proxyquire('../src/blockchain-wallet', stubs)
 
@@ -446,6 +457,42 @@ describe "HDWallet", ->
       it ".getPrivateKeyForAddress", ->
         pending()
 
+    describe "_updateWalletInfo()", ->
+      multiaddr = {
+        wallet:
+          total_sent: 1
+          total_received: 0
+          final_balance: 0
+          n_tx: 1
+        addresses: [
+          {
+              address:"1CzYCAAi46b8CFiybd3CcGbUykCAeqaocj",
+              n_tx:1,
+              total_received: 0,
+              total_sent: 1,
+              final_balance: 0
+          }
+        ]
+        txs: [
+          {
+            hash: "1234"
+          }
+        ]
+        info:
+          latest_block: 300000
+      }
+      beforeEach ->
+        spyOn(WalletStore, "pushTransaction").and.callThrough()
+
+      it "should add a new transaction", ->
+        wallet._updateWalletInfo(multiaddr)
+        expect(WalletStore.pushTransaction).toHaveBeenCalled()
+
+      it "should not add a duplicate transaction", ->
+        wallet._updateWalletInfo(multiaddr)
+        wallet._updateWalletInfo(multiaddr)
+        expect(WalletStore.getTransactions().length).toEqual(1)
+
     describe "JSON serialization", ->
 
       it 'should hold: fromJSON . toJSON = id', ->
diff --git a/tests/transaction_list_spec.js.coffee b/tests/transaction_list_spec.js.coffee
index 1e13aba8b..c25c9847b 100644
--- a/tests/transaction_list_spec.js.coffee
+++ b/tests/transaction_list_spec.js.coffee
@@ -50,13 +50,33 @@ describe 'TransactionList', ->
       expect(txList.transactions().length).toEqual(1)
       done()
 
+  it 'should not add duplicate tx to the list', (done) ->
+    txList.fetchTxs().then (numFetched1) ->
+
+      txList.fetchTxs().then (numFetched2) ->
+        expect(numFetched1).toEqual(1)
+        expect(numFetched2).toEqual(1)
+
+        expect(txList.transactions().length).toEqual(1)
+        done()
+
   it 'should add txs to the tx list', ->
     txList.pushTxs({ txType: 'sent' })
     expect(txList.transactions.length).toEqual(1)
 
   it 'should prepend txs to the tx list', ->
-    txList.shiftTxs({ txType: 'sent' })
-    expect(txList.transactions.length).toEqual(1)
+    expect(txList.transactions().length).toEqual(0)
+
+    txList.shiftTxs({ txType: 'sent', hash: "1234" })
+    expect(txList.transactions().length).toEqual(1)
+
+  it 'should not prepend duplicate txs to the tx list', ->
+    txList.shiftTxs({ txType: 'sent', hash: "1234"})
+    txList.shiftTxs({ txType: 'sent', hash: "1234"})
+
+    expect(txList.transactions().length).toEqual(1)
+
+
 
   describe 'events', ->
     spy = undefined
diff --git a/tests/wallet_store_spec.js.coffee b/tests/wallet_store_spec.js.coffee
new file mode 100644
index 000000000..a89b51cd5
--- /dev/null
+++ b/tests/wallet_store_spec.js.coffee
@@ -0,0 +1,44 @@
+proxyquire = require('proxyquireify')(require)
+MyWallet = {
+  wallet: {
+    getHistory: () ->
+    syncWallet: () ->
+  }
+}
+
+stubs = {
+  './wallet': MyWallet,
+}
+
+WalletStore    = proxyquire('../src/wallet-store', stubs)
+
+describe "WalletStore", ->
+
+  beforeEach ->
+    spyOn(MyWallet, "syncWallet")
+    spyOn(MyWallet.wallet, "getHistory")
+
+  describe "instance", ->
+    beforeEach ->
+
+    describe "getTransactions()", ->
+      it "should return nothing initially", ->
+        expect(WalletStore.getTransactions()).toEqual([])
+
+    describe "pushTransaction()", ->
+
+      it "add a transaction", ->
+        tx = {hash: "1234"}
+        WalletStore.pushTransaction(tx)
+        expect(WalletStore.getTransactions()).toEqual([tx])
+
+    describe "getTransaction()", ->
+      it "should return a transaction with the right hash", ->
+        tx1 = {hash: "1234"}
+        tx2 = {hash: "5678"}
+
+        WalletStore.pushTransaction(tx1)
+        WalletStore.pushTransaction(tx2)
+
+        expect(WalletStore.getTransaction("1234")).toEqual(tx1)
+        expect(WalletStore.getTransaction("5678")).toEqual(tx2)