diff --git a/Cargo.lock b/Cargo.lock
index 0da2d3b52..eb86cd47b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1290,7 +1290,7 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#76b1f17e5a446de76493530d1d9d330e08d6ceac"
+source = "git+https://github.com/ethcore/js-precompiled.git#eb9d978ed5ad1c514b37e89c716f80b3c8d613b5"
 dependencies = [
  "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/ethcore/light/src/net/context.rs b/ethcore/light/src/net/context.rs
index e58bca7f3..d9910f958 100644
--- a/ethcore/light/src/net/context.rs
+++ b/ethcore/light/src/net/context.rs
@@ -16,13 +16,13 @@
 
 //! I/O and event context generalizations.
 
-use network::{NetworkContext, PeerId};
+use network::{NetworkContext, PeerId, NodeId};
 
 use super::{Announcement, LightProtocol, ReqId};
 use super::error::Error;
 use request::Request;
 
-/// An I/O context which allows sending and receiving packets as well as 
+/// An I/O context which allows sending and receiving packets as well as
 /// disconnecting peers. This is used as a generalization of the portions
 /// of a p2p network which the light protocol structure makes use of.
 pub trait IoContext {
@@ -41,8 +41,12 @@ pub trait IoContext {
 
 	/// Get a peer's protocol version.
 	fn protocol_version(&self, peer: PeerId) -> Option<u8>;
+
+	/// Persistent peer id
+	fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId>;
 }
 
+
 impl<'a> IoContext for NetworkContext<'a> {
 	fn send(&self, peer: PeerId, packet_id: u8, packet_body: Vec<u8>) {
 		if let Err(e) = self.send(peer, packet_id, packet_body) {
@@ -67,6 +71,10 @@ impl<'a> IoContext for NetworkContext<'a> {
 	fn protocol_version(&self, peer: PeerId) -> Option<u8> {
 		self.protocol_version(self.subprotocol_name(), peer)
 	}
+
+	fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId> {
+		self.session_info(peer).and_then(|info| info.id)
+	}
 }
 
 /// Context for a protocol event.
@@ -75,6 +83,9 @@ pub trait EventContext {
 	/// disconnected/connected peer.
 	fn peer(&self) -> PeerId;
 
+	/// Returns the relevant's peer persistent Id (aka NodeId).
+	fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId>;
+
 	/// Make a request from a peer.
 	fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error>;
 
@@ -89,7 +100,7 @@ pub trait EventContext {
 	fn disable_peer(&self, peer: PeerId);
 }
 
-/// Concrete implementation of `EventContext` over the light protocol struct and 
+/// Concrete implementation of `EventContext` over the light protocol struct and
 /// an io context.
 pub struct Ctx<'a> {
 	/// Io context to enable immediate response to events.
@@ -97,11 +108,18 @@ pub struct Ctx<'a> {
 	/// Protocol implementation.
 	pub proto: &'a LightProtocol,
 	/// Relevant peer for event.
-	pub peer: PeerId, 
+	pub peer: PeerId,
 }
 
 impl<'a> EventContext for Ctx<'a> {
-	fn peer(&self) -> PeerId { self.peer }
+	fn peer(&self) -> PeerId {
+		self.peer
+	}
+
+	fn persistent_peer_id(&self, id: PeerId) -> Option<NodeId> {
+		self.io.persistent_peer_id(id)
+	}
+
 	fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error> {
 		self.proto.request_from(self.io, &peer, request)
 	}
@@ -117,4 +135,4 @@ impl<'a> EventContext for Ctx<'a> {
 	fn disable_peer(&self, peer: PeerId) {
 		self.io.disable_peer(peer);
 	}
-}
\ No newline at end of file
+}
diff --git a/ethcore/light/src/net/tests/mod.rs b/ethcore/light/src/net/tests/mod.rs
index 24ce4250a..99f695b81 100644
--- a/ethcore/light/src/net/tests/mod.rs
+++ b/ethcore/light/src/net/tests/mod.rs
@@ -15,13 +15,13 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 //! Tests for the `LightProtocol` implementation.
-//! These don't test of the higher level logic on top of 
+//! These don't test of the higher level logic on top of
 
 use ethcore::blockchain_info::BlockChainInfo;
 use ethcore::client::{BlockChainClient, EachBlockWith, TestBlockChainClient};
 use ethcore::ids::BlockId;
 use ethcore::transaction::SignedTransaction;
-use network::PeerId;
+use network::{PeerId, NodeId};
 
 use net::buffer_flow::FlowParams;
 use net::context::IoContext;
@@ -68,6 +68,10 @@ impl IoContext for Expect {
 	fn protocol_version(&self, _peer: PeerId) -> Option<u8> {
 		Some(super::MAX_PROTOCOL_VERSION)
 	}
+
+	fn persistent_peer_id(&self, _peer: PeerId) -> Option<NodeId> {
+		None
+	}
 }
 
 // can't implement directly for Arc due to cross-crate orphan rules.
@@ -117,7 +121,7 @@ impl Provider for TestProvider {
 			.map(|x: u64| x.saturating_mul(req.skip + 1))
 			.take_while(|x| if req.reverse { x < &start_num } else { best_num - start_num >= *x })
 			.map(|x| if req.reverse { start_num - x } else { start_num + x })
-			.map(|x| self.0.client.block_header(BlockId::Number(x))) 
+			.map(|x| self.0.client.block_header(BlockId::Number(x)))
 			.take_while(|x| x.is_some())
 			.flat_map(|x| x)
 			.collect()
@@ -150,12 +154,12 @@ impl Provider for TestProvider {
 					}
 				}
 			})
-			.collect()		
+			.collect()
 	}
 
 	fn contract_code(&self, req: request::ContractCodes) -> Vec<Bytes> {
 		req.code_requests.into_iter()
-			.map(|req| { 
+			.map(|req| {
                 req.account_key.iter().chain(req.account_key.iter()).cloned().collect()
 			 })
 			.collect()
@@ -213,9 +217,9 @@ fn status(chain_info: BlockChainInfo) -> Status {
 #[test]
 fn handshake_expected() {
 	let flow_params = make_flow_params();
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let status = status(provider.client.chain_info());
 
@@ -228,9 +232,9 @@ fn handshake_expected() {
 #[should_panic]
 fn genesis_mismatch() {
 	let flow_params = make_flow_params();
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let mut status = status(provider.client.chain_info());
 	status.genesis_hash = H256::default();
@@ -243,15 +247,15 @@ fn genesis_mismatch() {
 #[test]
 fn buffer_overflow() {
 	let flow_params = make_flow_params();
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));	
+		let packet_body = write_handshake(&status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
 	}
 
 	{
@@ -276,9 +280,9 @@ fn buffer_overflow() {
 #[test]
 fn get_block_headers() {
 	let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let cur_status = status(provider.client.chain_info());
 	let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@@ -288,8 +292,8 @@ fn get_block_headers() {
 	let cur_status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));	
+		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
 		proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
 	}
 
@@ -309,7 +313,7 @@ fn get_block_headers() {
 		let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Headers, 10);
 
 		let mut response_stream = RlpStream::new_list(3);
-		
+
 		response_stream.append(&req_id).append(&new_buf).begin_list(10);
 		for header in headers {
 			response_stream.append_raw(&header, 1);
@@ -325,9 +329,9 @@ fn get_block_headers() {
 #[test]
 fn get_block_bodies() {
 	let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let cur_status = status(provider.client.chain_info());
 	let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@@ -337,8 +341,8 @@ fn get_block_bodies() {
 	let cur_status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));	
+		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
 		proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
 	}
 
@@ -356,7 +360,7 @@ fn get_block_bodies() {
 		let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Bodies, 10);
 
 		let mut response_stream = RlpStream::new_list(3);
-		
+
 		response_stream.append(&req_id).append(&new_buf).begin_list(10);
 		for body in bodies {
 			response_stream.append_raw(&body, 1);
@@ -372,9 +376,9 @@ fn get_block_bodies() {
 #[test]
 fn get_block_receipts() {
 	let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let cur_status = status(provider.client.chain_info());
 	let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@@ -384,8 +388,8 @@ fn get_block_receipts() {
 	let cur_status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));	
+		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
 		proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
 	}
 
@@ -409,7 +413,7 @@ fn get_block_receipts() {
 		let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Receipts, receipts.len());
 
 		let mut response_stream = RlpStream::new_list(3);
-		
+
 		response_stream.append(&req_id).append(&new_buf).begin_list(receipts.len());
 		for block_receipts in receipts {
 			response_stream.append_raw(&block_receipts, 1);
@@ -425,15 +429,15 @@ fn get_block_receipts() {
 #[test]
 fn get_state_proofs() {
 	let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let cur_status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));	
+		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
 		proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &packet_body);
 	}
 
@@ -441,7 +445,7 @@ fn get_state_proofs() {
 	let key1 = U256::from(11223344).into();
 	let key2 = U256::from(99988887).into();
 
-	let request = Request::StateProofs (request::StateProofs { 
+	let request = Request::StateProofs (request::StateProofs {
 		requests: vec![
 			request::StateProof { block: H256::default(), key1: key1, key2: None, from_level: 0 },
 			request::StateProof { block: H256::default(), key1: key1, key2: Some(key2), from_level: 0},
@@ -458,7 +462,7 @@ fn get_state_proofs() {
 		let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::StateProofs, 2);
 
 		let mut response_stream = RlpStream::new_list(3);
-		
+
 		response_stream.append(&req_id).append(&new_buf).begin_list(2);
 		for proof in proofs {
 			response_stream.append_raw(&proof, 1);
@@ -474,15 +478,15 @@ fn get_state_proofs() {
 #[test]
 fn get_contract_code() {
 	let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
-	let capabilities = capabilities();	
+	let capabilities = capabilities();
 
-	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());	
+	let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
 
 	let cur_status = status(provider.client.chain_info());
 
 	{
-		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));	
-		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));	
+		let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
+		proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
 		proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &packet_body);
 	}
 
@@ -490,7 +494,7 @@ fn get_contract_code() {
 	let key1 = U256::from(11223344).into();
 	let key2 = U256::from(99988887).into();
 
-	let request = Request::Codes (request::ContractCodes { 
+	let request = Request::Codes (request::ContractCodes {
 		code_requests: vec![
 			request::ContractCode { block_hash: H256::default(), account_key: key1 },
 			request::ContractCode { block_hash: H256::default(), account_key: key2 },
@@ -507,7 +511,7 @@ fn get_contract_code() {
 		let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Codes, 2);
 
 		let mut response_stream = RlpStream::new_list(3);
-		
+
 		response_stream.append(&req_id).append(&new_buf).begin_list(2);
 		for code in codes {
 			response_stream.append(&code);
@@ -518,4 +522,4 @@ fn get_contract_code() {
 
 	let expected = Expect::Respond(packet::CONTRACT_CODES, response);
 	proto.handle_packet(&expected, &1, packet::GET_CONTRACT_CODES, &request_body);
-}
\ No newline at end of file
+}
diff --git a/ethcore/src/client/chain_notify.rs b/ethcore/src/client/chain_notify.rs
index d9ebac299..a9f8d0204 100644
--- a/ethcore/src/client/chain_notify.rs
+++ b/ethcore/src/client/chain_notify.rs
@@ -40,6 +40,14 @@ pub trait ChainNotify : Send + Sync {
 	fn stop(&self) {
 		// does nothing by default
 	}
+
+	/// fires when new transactions are received from a peer
+	fn transactions_received(&self,
+		_hashes: Vec<H256>,
+		_peer_id: usize,
+	) {
+		// does nothing by default
+	}
 }
 
 impl IpcConfig for ChainNotify { }
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index fb8b5a9f2..dce594617 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -559,11 +559,15 @@ impl Client {
 	}
 
 	/// Import transactions from the IO queue
-	pub fn import_queued_transactions(&self, transactions: &[Bytes]) -> usize {
+	pub fn import_queued_transactions(&self, transactions: &[Bytes], peer_id: usize) -> usize {
 		trace!(target: "external_tx", "Importing queued");
 		let _timer = PerfTimer::new("import_queued_transactions");
 		self.queue_transactions.fetch_sub(transactions.len(), AtomicOrdering::SeqCst);
-		let txs = transactions.iter().filter_map(|bytes| UntrustedRlp::new(bytes).as_val().ok()).collect();
+		let txs: Vec<SignedTransaction> = transactions.iter().filter_map(|bytes| UntrustedRlp::new(bytes).as_val().ok()).collect();
+		let hashes: Vec<_> = txs.iter().map(|tx| tx.hash()).collect();
+		self.notify(|notify| {
+			notify.transactions_received(hashes.clone(), peer_id);
+		});
 		let results = self.miner.import_external_transactions(self, txs);
 		results.len()
 	}
@@ -1264,14 +1268,14 @@ impl BlockChainClient for Client {
 		(*self.build_last_hashes(self.chain.read().best_block_hash())).clone()
 	}
 
-	fn queue_transactions(&self, transactions: Vec<Bytes>) {
+	fn queue_transactions(&self, transactions: Vec<Bytes>, peer_id: usize) {
 		let queue_size = self.queue_transactions.load(AtomicOrdering::Relaxed);
 		trace!(target: "external_tx", "Queue size: {}", queue_size);
 		if queue_size > MAX_TX_QUEUE_SIZE {
 			debug!("Ignoring {} transactions: queue is full", transactions.len());
 		} else {
 			let len = transactions.len();
-			match self.io_channel.lock().send(ClientIoMessage::NewTransactions(transactions)) {
+			match self.io_channel.lock().send(ClientIoMessage::NewTransactions(transactions, peer_id)) {
 				Ok(_) => {
 					self.queue_transactions.fetch_add(len, AtomicOrdering::SeqCst);
 				}
diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 8442d723b..44954f99d 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -657,7 +657,7 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
-	fn queue_transactions(&self, transactions: Vec<Bytes>) {
+	fn queue_transactions(&self, transactions: Vec<Bytes>, _peer_id: usize) {
 		// import right here
 		let txs = transactions.into_iter().filter_map(|bytes| UntrustedRlp::new(&bytes).as_val().ok()).collect();
 		self.miner.import_external_transactions(self, txs);
diff --git a/ethcore/src/client/traits.rs b/ethcore/src/client/traits.rs
index 4b6609cf6..f44a4496f 100644
--- a/ethcore/src/client/traits.rs
+++ b/ethcore/src/client/traits.rs
@@ -200,7 +200,7 @@ pub trait BlockChainClient : Sync + Send {
 	fn last_hashes(&self) -> LastHashes;
 
 	/// Queue transactions for importing.
-	fn queue_transactions(&self, transactions: Vec<Bytes>);
+	fn queue_transactions(&self, transactions: Vec<Bytes>, peer_id: usize);
 
 	/// list all transactions
 	fn pending_transactions(&self) -> Vec<SignedTransaction>;
@@ -294,9 +294,9 @@ pub trait ProvingBlockChainClient: BlockChainClient {
 	/// The key is the keccak hash of the account's address.
 	/// Returns a vector of raw trie nodes (in order from the root) proving the query.
 	/// Nodes after `from_level` may be omitted.
-	/// An empty vector indicates unservable query.	
+	/// An empty vector indicates unservable query.
 	fn prove_account(&self, key1: H256, from_level: u32, id: BlockId) -> Vec<Bytes>;
 
 	/// Get code by address hash.
 	fn code_by_hash(&self, account_key: H256, id: BlockId) -> Bytes;
-}
\ No newline at end of file
+}
diff --git a/ethcore/src/service.rs b/ethcore/src/service.rs
index bf346e707..d809de51a 100644
--- a/ethcore/src/service.rs
+++ b/ethcore/src/service.rs
@@ -39,7 +39,7 @@ pub enum ClientIoMessage {
 	/// A block is ready
 	BlockVerified,
 	/// New transaction RLPs are ready to be imported
-	NewTransactions(Vec<Bytes>),
+	NewTransactions(Vec<Bytes>, usize),
 	/// Begin snapshot restoration
 	BeginRestoration(ManifestData),
 	/// Feed a state chunk to the snapshot service
@@ -196,7 +196,9 @@ impl IoHandler<ClientIoMessage> for ClientIoHandler {
 
 		match *net_message {
 			ClientIoMessage::BlockVerified => { self.client.import_verified_blocks(); }
-			ClientIoMessage::NewTransactions(ref transactions) => { self.client.import_queued_transactions(transactions); }
+			ClientIoMessage::NewTransactions(ref transactions, peer_id) => {
+				self.client.import_queued_transactions(transactions, peer_id);
+			}
 			ClientIoMessage::BeginRestoration(ref manifest) => {
 				if let Err(e) = self.snapshot.init_restore(manifest.clone(), true) {
 					warn!("Failed to initialize snapshot restoration: {}", e);
diff --git a/js/package.json b/js/package.json
index 692bc5707..95b15bb83 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parity.js",
-  "version": "0.2.116",
+  "version": "0.2.119",
   "main": "release/index.js",
   "jsnext:main": "src/index.js",
   "author": "Parity Team <admin@parity.io>",
diff --git a/js/src/dapps/localtx/Transaction/transaction.js b/js/src/dapps/localtx/Transaction/transaction.js
index fab5bf152..1756597ab 100644
--- a/js/src/dapps/localtx/Transaction/transaction.js
+++ b/js/src/dapps/localtx/Transaction/transaction.js
@@ -48,7 +48,6 @@ class BaseTransaction extends Component {
         <IdentityIcon
           address={ transaction.from }
           />
-        0x{ transaction.nonce.toString(16) }
       </div>
     );
   }
diff --git a/js/src/dapps/localtx/Transaction/transaction.spec.js b/js/src/dapps/localtx/Transaction/transaction.spec.js
index 70fb4a08b..1f176a3c3 100644
--- a/js/src/dapps/localtx/Transaction/transaction.spec.js
+++ b/js/src/dapps/localtx/Transaction/transaction.spec.js
@@ -34,7 +34,7 @@ describe('dapps/localtx/Transaction', () => {
     it('renders without crashing', () => {
       const transaction = {
         hash: '0x1234567890',
-        nonce: 15,
+        nonce: new BigNumber(15),
         gasPrice: new BigNumber(10),
         gas: new BigNumber(10)
       };
diff --git a/js/src/modals/AddAddress/addAddress.js b/js/src/modals/AddAddress/addAddress.js
index 177223290..437b87663 100644
--- a/js/src/modals/AddAddress/addAddress.js
+++ b/js/src/modals/AddAddress/addAddress.js
@@ -14,31 +14,29 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-import React, { Component, PropTypes } from 'react';
 import ContentAdd from 'material-ui/svg-icons/content/add';
 import ContentClear from 'material-ui/svg-icons/content/clear';
+import { observer } from 'mobx-react';
+import React, { Component, PropTypes } from 'react';
+import { FormattedMessage } from 'react-intl';
 
-import { Button, Modal, Form, Input, InputAddress } from '~/ui';
-import { ERRORS, validateAddress, validateName } from '~/util/validation';
+import { Button, Form, Input, InputAddress, Modal } from '~/ui';
 
+import Store from './store';
+
+@observer
 export default class AddAddress extends Component {
   static contextTypes = {
     api: PropTypes.object.isRequired
   }
 
   static propTypes = {
-    contacts: PropTypes.object.isRequired,
     address: PropTypes.string,
-    onClose: PropTypes.func
+    contacts: PropTypes.object.isRequired,
+    onClose: PropTypes.func.isRequired
   };
 
-  state = {
-    address: '',
-    addressError: ERRORS.invalidAddress,
-    name: '',
-    nameError: ERRORS.invalidName,
-    description: ''
-  };
+  store = new Store(this.context.api, this.props.contacts);
 
   componentWillMount () {
     if (this.props.address) {
@@ -49,109 +47,113 @@ export default class AddAddress extends Component {
   render () {
     return (
       <Modal
-        visible
         actions={ this.renderDialogActions() }
-        title='add saved address'>
+        title={
+          <FormattedMessage
+            id='addAddress.label'
+            defaultMessage='add saved address' />
+        }
+        visible>
         { this.renderFields() }
       </Modal>
     );
   }
 
   renderDialogActions () {
-    const { addressError, nameError } = this.state;
-    const hasError = !!(addressError || nameError);
+    const { hasError } = this.store;
 
     return ([
       <Button
         icon={ <ContentClear /> }
-        label='Cancel'
-        onClick={ this.onClose } />,
+        label={
+          <FormattedMessage
+            id='addAddress.button.close'
+            defaultMessage='Cancel' />
+        }
+        onClick={ this.onClose }
+        ref='closeButton' />,
       <Button
-        icon={ <ContentAdd /> }
-        label='Save Address'
         disabled={ hasError }
-        onClick={ this.onAdd } />
+        icon={ <ContentAdd /> }
+        label={
+          <FormattedMessage
+            id='addAddress.button.add'
+            defaultMessage='Save Address' />
+        }
+        onClick={ this.onAdd }
+        ref='addButton' />
     ]);
   }
 
   renderFields () {
-    const { address, addressError, description, name, nameError } = this.state;
+    const { address, addressError, description, name, nameError } = this.store;
 
     return (
       <Form>
         <InputAddress
-          label='network address'
-          hint='the network address for the entry'
-          error={ addressError }
-          value={ address }
-          disabled={ !!this.props.address }
           allowCopy={ false }
-          onChange={ this.onEditAddress } />
+          disabled={ !!this.props.address }
+          error={ addressError }
+          hint={
+            <FormattedMessage
+              id='addAddress.input.address.hint'
+              defaultMessage='the network address for the entry' />
+          }
+          label={
+            <FormattedMessage
+              id='addAddress.input.address.label'
+              defaultMessage='network address' />
+          }
+          onChange={ this.onEditAddress }
+          ref='inputAddress'
+          value={ address } />
         <Input
-          label='address name'
-          hint='a descriptive name for the entry'
           error={ nameError }
-          value={ name }
-          onChange={ this.onEditName } />
+          hint={
+            <FormattedMessage
+              id='addAddress.input.name.hint'
+              defaultMessage='a descriptive name for the entry' />
+          }
+          label={
+            <FormattedMessage
+              id='addAddress.input.name.label'
+              defaultMessage='address name' />
+          }
+          onChange={ this.onEditName }
+          ref='inputName'
+          value={ name } />
         <Input
-          multiLine
-          rows={ 1 }
-          label='(optional) address description'
-          hint='an expanded description for the entry'
-          value={ description }
-          onChange={ this.onEditDescription } />
+          hint={
+            <FormattedMessage
+              id='addAddress.input.description.hint'
+              defaultMessage='an expanded description for the entry' />
+          }
+          label={
+            <FormattedMessage
+              id='addAddress.input.description.label'
+              defaultMessage='(optional) address description' />
+          }
+          onChange={ this.onEditDescription }
+          ref='inputDescription'
+          value={ description } />
       </Form>
     );
   }
 
-  onEditAddress = (event, _address) => {
-    const { contacts } = this.props;
-    let { address, addressError } = validateAddress(_address);
-
-    if (!addressError) {
-      const contact = contacts[address];
-
-      if (contact) {
-        addressError = ERRORS.duplicateAddress;
-      }
-    }
-
-    this.setState({
-      address,
-      addressError
-    });
+  onEditAddress = (event, address) => {
+    this.store.setAddress(address);
   }
 
   onEditDescription = (event, description) => {
-    this.setState({
-      description
-    });
+    this.store.setDescription(description);
   }
 
-  onEditName = (event, _name) => {
-    const { name, nameError } = validateName(_name);
-
-    this.setState({
-      name,
-      nameError
-    });
+  onEditName = (event, name) => {
+    this.store.setName(name);
   }
 
   onAdd = () => {
-    const { api } = this.context;
-    const { address, name, description } = this.state;
-
-    Promise.all([
-      api.parity.setAccountName(address, name),
-      api.parity.setAccountMeta(address, {
-        description,
-        timestamp: Date.now(),
-        deleted: false
-      })
-    ]).catch((error) => {
-      console.error('onAdd', error);
-    });
-
+    this.store.add();
     this.props.onClose();
   }
 
diff --git a/js/src/modals/AddAddress/addAddress.spec.js b/js/src/modals/AddAddress/addAddress.spec.js
new file mode 100644
index 000000000..e03abd9d6
--- /dev/null
+++ b/js/src/modals/AddAddress/addAddress.spec.js
@@ -0,0 +1,32 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import { shallow } from 'enzyme';
+import React from 'react';
+
+import AddAddress from './';
+
+describe('modals/AddAddress', () => {
+  describe('rendering', () => {
+    it('renders defaults', () => {
+      expect(
+        shallow(
+          <AddAddress />
+        )
+      ).to.be.ok;
+    });
+  });
+});
diff --git a/js/src/modals/AddAddress/store.js b/js/src/modals/AddAddress/store.js
new file mode 100644
index 000000000..fd248a361
--- /dev/null
+++ b/js/src/modals/AddAddress/store.js
@@ -0,0 +1,87 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import { action, computed, transaction, observable } from 'mobx';
+
+import { ERRORS, validateAddress, validateName } from '~/util/validation';
+
+export default class Store {
+  @observable address = '';
+  @observable addressError = ERRORS.invalidAddress;
+  @observable createError = null;
+  @observable description = '';
+  @observable name = '';
+  @observable nameError = ERRORS.invalidName;
+
+  constructor (api, contacts) {
+    this._api = api;
+    this._contacts = contacts;
+  }
+
+  @computed get hasError () {
+    return !!(this.addressError || this.nameError);
+  }
+
+  @action setAddress = (_address) => {
+    let { address, addressError } = validateAddress(_address);
+
+    if (!addressError) {
+      const contact = this._contacts[address];
+
+      if (contact) {
+        addressError = ERRORS.duplicateAddress;
+      }
+    }
+
+    transaction(() => {
+      this.address = address;
+      this.addressError = addressError;
+    });
+  }
+
+  @action setCreateError = (error) => {
+    this.createError = error;
+  }
+
+  @action setDescription = (description) => {
+    this.description = description;
+  }
+
+  @action setName = (_name) => {
+    const { name, nameError } = validateName(_name);
+
+    transaction(() => {
+      this.name = name;
+      this.nameError = nameError;
+    });
+  }
+
+  add () {
+    return Promise
+      .all([
+        this._api.parity.setAccountName(this.address, this.name),
+        this._api.parity.setAccountMeta(this.address, {
+          description: this.description,
+          timestamp: Date.now(),
+          deleted: false
+        })
+      ])
+      .catch((error) => {
+        console.warn('Store:add', error);
+        this.setCreateError(error);
+      });
+  }
+}
diff --git a/js/src/modals/AddAddress/store.spec.js b/js/src/modals/AddAddress/store.spec.js
new file mode 100644
index 000000000..c730fa32f
--- /dev/null
+++ b/js/src/modals/AddAddress/store.spec.js
@@ -0,0 +1,128 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import sinon from 'sinon';
+
+import Store from './store';
+
+import { TEST_ADDR_A, TEST_ADDR_B, TEST_CONTACTS } from './store.test.js';
+
+describe('modals/AddAddress/store', () => {
+  let store;
+
+  describe('@action', () => {
+    beforeEach(() => {
+      store = new Store(null, TEST_CONTACTS);
+    });
+
+    describe('setAddress', () => {
+      it('successfully sets non-existent addresses', () => {
+        store.setAddress(TEST_ADDR_B);
+
+        expect(store.addressError).to.be.null;
+        expect(store.address).to.equal(TEST_ADDR_B);
+      });
+
+      it('fails on invalid addresses', () => {
+        store.setAddress('0xinvalid');
+
+        expect(store.addressError).not.to.be.null;
+      });
+
+      it('fails when an address is already added', () => {
+        store.setAddress(TEST_ADDR_A);
+
+        expect(store.addressError).not.to.be.null;
+      });
+    });
+
+    describe('setName', () => {
+      it('sucessfully sets valid names', () => {
+        const name = 'Test Name';
+
+        store.setName(name);
+
+        expect(store.nameError).to.be.null;
+        expect(store.name).to.equal(name);
+      });
+
+      it('fails when name is invalid', () => {
+        store.setName(null);
+
+        expect(store.nameError).not.to.be.null;
+      });
+    });
+  });
+
+  describe('@computed', () => {
+    beforeEach(() => {
+      store = new Store(null, TEST_CONTACTS);
+    });
+
+    describe('hasError', () => {
+      beforeEach(() => {
+        store.setAddress(TEST_ADDR_B);
+        store.setName('Test Name');
+      });
+
+      it('returns false proper inputs', () => {
+        expect(store.hasError).to.be.false;
+      });
+
+      it('returns true with addressError', () => {
+        store.setAddress(TEST_ADDR_A);
+
+        expect(store.addressError).not.to.be.null;
+        expect(store.hasError).to.be.true;
+      });
+
+      it('returns true with nameError', () => {
+        store.setName(null);
+
+        expect(store.nameError).not.to.be.null;
+        expect(store.hasError).to.be.true;
+      });
+    });
+  });
+
+  describe('methods', () => {
+    let api;
+
+    beforeEach(() => {
+      api = {
+        parity: {
+          setAccountMeta: sinon.stub().resolves(true),
+          setAccountName: sinon.stub().resolves(true)
+        }
+      };
+      store = new Store(api, {});
+    });
+
+    describe('add', () => {
+      it('calls setAccountMeta', () => {
+        store.add();
+
+        expect(api.parity.setAccountMeta).to.have.been.called;
+      });
+
+      it('calls setAccountName', () => {
+        store.add();
+
+        expect(api.parity.setAccountName).to.have.been.called;
+      });
+    });
+  });
+});
diff --git a/js/src/modals/AddAddress/store.test.js b/js/src/modals/AddAddress/store.test.js
new file mode 100644
index 000000000..1d497a328
--- /dev/null
+++ b/js/src/modals/AddAddress/store.test.js
@@ -0,0 +1,28 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+const TEST_ADDR_A = '0x63Cf90D3f0410092FC0fca41846f596223979195';
+const TEST_ADDR_B = '0x00A40dEfa9933e82244bE542Fa7F8748eCCdd457';
+
+const TEST_CONTACTS = {
+  [TEST_ADDR_A]: { name: 'test', meta: {} }
+};
+
+export {
+  TEST_ADDR_A,
+  TEST_ADDR_B,
+  TEST_CONTACTS
+};
diff --git a/js/src/redux/providers/personalActions.js b/js/src/redux/providers/personalActions.js
index b172aaf8d..7ca7c3374 100644
--- a/js/src/redux/providers/personalActions.js
+++ b/js/src/redux/providers/personalActions.js
@@ -19,6 +19,8 @@ import { isEqual } from 'lodash';
 import { fetchBalances } from './balancesActions';
 import { attachWallets } from './walletActions';
 
+import MethodDecodingStore from '~/ui/MethodDecoding/methodDecodingStore';
+
 export function personalAccountsInfo (accountsInfo) {
   const accounts = {};
   const contacts = {};
@@ -41,6 +43,9 @@ export function personalAccountsInfo (accountsInfo) {
       }
     });
 
+  // Load user contracts for Method Decoding
+  MethodDecodingStore.loadContracts(contracts);
+
   return (dispatch) => {
     const data = {
       accountsInfo,
diff --git a/js/src/ui/Form/AddressSelect/addressSelect.js b/js/src/ui/Form/AddressSelect/addressSelect.js
index 3fb15cd86..c443ecaa2 100644
--- a/js/src/ui/Form/AddressSelect/addressSelect.js
+++ b/js/src/ui/Form/AddressSelect/addressSelect.js
@@ -16,6 +16,7 @@
 
 import React, { Component, PropTypes } from 'react';
 import { MenuItem } from 'material-ui';
+import { isEqual, pick } from 'lodash';
 
 import AutoComplete from '../AutoComplete';
 import IdentityIcon from '../../IdentityIcon';
@@ -31,19 +32,20 @@ export default class AddressSelect extends Component {
   }
 
   static propTypes = {
-    disabled: PropTypes.bool,
+    onChange: PropTypes.func.isRequired,
+
     accounts: PropTypes.object,
+    allowInput: PropTypes.bool,
+    balances: PropTypes.object,
     contacts: PropTypes.object,
     contracts: PropTypes.object,
-    wallets: PropTypes.object,
-    label: PropTypes.string,
-    hint: PropTypes.string,
+    disabled: PropTypes.bool,
     error: PropTypes.string,
-    value: PropTypes.string,
+    hint: PropTypes.string,
+    label: PropTypes.string,
     tokens: PropTypes.object,
-    onChange: PropTypes.func.isRequired,
-    allowInput: PropTypes.bool,
-    balances: PropTypes.object
+    value: PropTypes.string,
+    wallets: PropTypes.object
   }
 
   state = {
@@ -53,6 +55,9 @@ export default class AddressSelect extends Component {
     value: ''
   }
 
+  // Cache autocomplete items
+  items = {}
+
   entriesFromProps (props = this.props) {
     const { accounts = {}, contacts = {}, contracts = {}, wallets = {} } = props;
 
@@ -76,6 +81,15 @@ export default class AddressSelect extends Component {
     return { autocompleteEntries, entries };
   }
 
+  shouldComponentUpdate (nextProps, nextState) {
+    const keys = [ 'error', 'value' ];
+
+    const prevValues = pick(this.props, keys);
+    const nextValues = pick(nextProps, keys);
+
+    return !isEqual(prevValues, nextValues);
+  }
+
   componentWillMount () {
     const { value } = this.props;
     const { entries, autocompleteEntries } = this.entriesFromProps();
@@ -143,14 +157,21 @@ export default class AddressSelect extends Component {
   renderItem = (entry) => {
     const { address, name } = entry;
 
-    return {
-      text: name && name.toUpperCase() || address,
-      value: this.renderMenuItem(address),
-      address
-    };
+    const _balance = this.getBalance(address);
+    const balance = _balance ? _balance.toNumber() : _balance;
+
+    if (!this.items[address] || this.items[address].balance !== balance) {
+      this.items[address] = {
+        text: name && name.toUpperCase() || address,
+        value: this.renderMenuItem(address),
+        address, balance
+      };
+    }
+
+    return this.items[address];
   }
 
-  renderBalance (address) {
+  getBalance (address) {
     const { balances = {} } = this.props;
     const balance = balances[address];
 
@@ -164,7 +185,12 @@ export default class AddressSelect extends Component {
       return null;
     }
 
-    const value = fromWei(ethToken.value);
+    return ethToken.value;
+  }
+
+  renderBalance (address) {
+    const balance = this.getBalance(address);
+    const value = fromWei(balance);
 
     return (
       <div className={ styles.balance }>
diff --git a/js/src/ui/Form/AutoComplete/autocomplete.css b/js/src/ui/Form/AutoComplete/autocomplete.css
new file mode 100644
index 000000000..9fad53edb
--- /dev/null
+++ b/js/src/ui/Form/AutoComplete/autocomplete.css
@@ -0,0 +1,24 @@
+/* Copyright 2015, 2016 Ethcore (UK) Ltd.
+/* This file is part of Parity.
+/*
+/* Parity is free software: you can redistribute it and/or modify
+/* it under the terms of the GNU General Public License as published by
+/* the Free Software Foundation, either version 3 of the License, or
+/* (at your option) any later version.
+/*
+/* Parity is distributed in the hope that it will be useful,
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+/* GNU General Public License for more details.
+/*
+/* You should have received a copy of the GNU General Public License
+/* along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+.item {
+  &:last-child {
+    &.divider {
+      display: none;
+    }
+  }
+}
diff --git a/js/src/ui/Form/AutoComplete/autocomplete.js b/js/src/ui/Form/AutoComplete/autocomplete.js
index c98019009..3ebd59772 100644
--- a/js/src/ui/Form/AutoComplete/autocomplete.js
+++ b/js/src/ui/Form/AutoComplete/autocomplete.js
@@ -21,13 +21,18 @@ import { PopoverAnimationVertical } from 'material-ui/Popover';
 
 import { isEqual } from 'lodash';
 
+import styles from './autocomplete.css';
+
 // Hack to prevent "Unknown prop `disableFocusRipple` on <hr> tag" error
 class Divider extends Component {
   static muiName = MUIDivider.muiName;
 
   render () {
     return (
-      <div style={ { margin: '0.25em 0' } }>
+      <div
+        style={ { margin: '0.25em 0' } }
+        className={ [styles.item, styles.divider].join(' ') }
+      >
         <MUIDivider style={ { height: 2 } } />
       </div>
     );
@@ -143,11 +148,16 @@ export default class AutoComplete extends Component {
 
       if (renderItem && typeof renderItem === 'function') {
         item = renderItem(entry);
+
+        // Add the item class to the entry
+        const classNames = [ styles.item ].concat(item.value.props.className);
+        item.value = React.cloneElement(item.value, { className: classNames.join(' ') });
       } else {
         item = {
           text: entry,
           value: (
             <MenuItem
+              className={ styles.item }
               primaryText={ entry }
             />
           )
@@ -160,6 +170,7 @@ export default class AutoComplete extends Component {
       }
 
       item.divider = currentDivider;
+      item.entry = entry;
 
       return item;
     }).filter((item) => item !== undefined);
@@ -215,13 +226,8 @@ export default class AutoComplete extends Component {
       return;
     }
 
-    const { entries } = this.props;
-
-    const entriesArray = (entries instanceof Array)
-      ? entries
-      : Object.values(entries);
-
-    const entry = entriesArray[idx];
+    const { dataSource } = this.state;
+    const { entry } = dataSource[idx];
 
     this.handleOnChange(entry);
     this.setState({ entry, open: false });
diff --git a/js/src/ui/Form/Input/input.js b/js/src/ui/Form/Input/input.js
index b11400d04..8351de2e6 100644
--- a/js/src/ui/Form/Input/input.js
+++ b/js/src/ui/Form/Input/input.js
@@ -18,6 +18,8 @@ import React, { Component, PropTypes } from 'react';
 import { TextField } from 'material-ui';
 import { noop } from 'lodash';
 
+import { nodeOrStringProptype } from '~/util/proptypes';
+
 import CopyToClipboard from '../../CopyToClipboard';
 
 import styles from './input.css';
@@ -41,18 +43,21 @@ const NAME_ID = ' ';
 
 export default class Input extends Component {
   static propTypes = {
-    children: PropTypes.node,
-    className: PropTypes.string,
-    disabled: PropTypes.bool,
-    readOnly: PropTypes.bool,
     allowCopy: PropTypes.oneOfType([
       PropTypes.string,
       PropTypes.bool
     ]),
-    floatCopy: PropTypes.bool,
+    children: PropTypes.node,
+    className: PropTypes.string,
+    disabled: PropTypes.bool,
     error: PropTypes.string,
-    hint: PropTypes.string,
-    label: PropTypes.string,
+    readOnly: PropTypes.bool,
+    floatCopy: PropTypes.bool,
+    hint: nodeOrStringProptype(),
+    hideUnderline: PropTypes.bool,
+    label: nodeOrStringProptype(),
+    max: PropTypes.any,
+    min: PropTypes.any,
     multiLine: PropTypes.bool,
     onBlur: PropTypes.func,
     onChange: PropTypes.func,
@@ -61,26 +66,26 @@ export default class Input extends Component {
     rows: PropTypes.number,
     type: PropTypes.string,
     submitOnBlur: PropTypes.bool,
-    hideUnderline: PropTypes.bool,
+    style: PropTypes.object,
     value: PropTypes.oneOfType([
-      PropTypes.number, PropTypes.string
-    ]),
-    min: PropTypes.any,
-    max: PropTypes.any,
-    style: PropTypes.object
+      PropTypes.number,
+      PropTypes.string
+    ])
   };
 
   static defaultProps = {
-    submitOnBlur: true,
-    readOnly: false,
     allowCopy: false,
     hideUnderline: false,
     floatCopy: false,
+    readOnly: false,
+    submitOnBlur: true,
     style: {}
   }
 
   state = {
-    value: typeof this.props.value === 'undefined' ? '' : this.props.value
+    value: typeof this.props.value === 'undefined'
+      ? ''
+      : this.props.value
   }
 
   componentWillReceiveProps (newProps) {
@@ -114,38 +119,29 @@ export default class Input extends Component {
           autoComplete='off'
           className={ className }
           errorText={ error }
-
           floatingLabelFixed
           floatingLabelText={ label }
-
+          fullWidth
           hintText={ hint }
           id={ NAME_ID }
           inputStyle={ inputStyle }
-          fullWidth
-
           max={ max }
           min={ min }
-
           multiLine={ multiLine }
           name={ NAME_ID }
-
           onBlur={ this.onBlur }
           onChange={ this.onChange }
           onKeyDown={ this.onKeyDown }
           onPaste={ this.onPaste }
-
           readOnly={ readOnly }
           rows={ rows }
           style={ textFieldStyle }
           type={ type || 'text' }
-
           underlineDisabledStyle={ UNDERLINE_DISABLED }
           underlineStyle={ readOnly ? UNDERLINE_READONLY : UNDERLINE_NORMAL }
           underlineFocusStyle={ readOnly ? { display: 'none' } : null }
           underlineShow={ !hideUnderline }
-
-          value={ value }
-        >
+          value={ value }>
           { children }
         </TextField>
       </div>
@@ -159,11 +155,14 @@ export default class Input extends Component {
     if (!allowCopy) {
       return null;
     }
+
     const text = typeof allowCopy === 'string'
       ? allowCopy
       : value;
 
-    const style = hideUnderline ? {} : { position: 'relative', top: '2px' };
+    const style = hideUnderline
+      ? {}
+      : { position: 'relative', top: '2px' };
 
     return (
       <div className={ styles.copy } style={ style }>
diff --git a/js/src/ui/Form/InputAddress/inputAddress.js b/js/src/ui/Form/InputAddress/inputAddress.js
index 1f062382a..e2a0707d5 100644
--- a/js/src/ui/Form/InputAddress/inputAddress.js
+++ b/js/src/ui/Form/InputAddress/inputAddress.js
@@ -18,28 +18,30 @@ import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
 import { bindActionCreators } from 'redux';
 
-import Input from '../Input';
-import IdentityIcon from '../../IdentityIcon';
 import util from '~/api/util';
+import { nodeOrStringProptype } from '~/util/proptypes';
+
+import IdentityIcon from '../../IdentityIcon';
+import Input from '../Input';
 
 import styles from './inputAddress.css';
 
 class InputAddress extends Component {
   static propTypes = {
+    accountsInfo: PropTypes.object,
+    allowCopy: PropTypes.bool,
     className: PropTypes.string,
     disabled: PropTypes.bool,
     error: PropTypes.string,
-    label: PropTypes.string,
-    hint: PropTypes.string,
-    value: PropTypes.string,
-    accountsInfo: PropTypes.object,
-    tokens: PropTypes.object,
-    text: PropTypes.bool,
+    hideUnderline: PropTypes.bool,
+    hint: nodeOrStringProptype(),
+    label: nodeOrStringProptype(),
     onChange: PropTypes.func,
     onSubmit: PropTypes.func,
-    hideUnderline: PropTypes.bool,
-    allowCopy: PropTypes.bool,
-    small: PropTypes.bool
+    small: PropTypes.bool,
+    text: PropTypes.bool,
+    tokens: PropTypes.object,
+    value: PropTypes.string
   };
 
   static defaultProps = {
@@ -49,8 +51,8 @@ class InputAddress extends Component {
   };
 
   render () {
-    const { className, disabled, error, label, hint, value, text } = this.props;
-    const { small, allowCopy, hideUnderline, onSubmit, accountsInfo, tokens } = this.props;
+    const { className, disabled, error, hint, label, text, value } = this.props;
+    const { accountsInfo, allowCopy, hideUnderline, onSubmit, small, tokens } = this.props;
 
     const account = accountsInfo[value] || tokens[value];
 
@@ -68,17 +70,20 @@ class InputAddress extends Component {
     return (
       <div className={ containerClasses.join(' ') }>
         <Input
+          allowCopy={ allowCopy && (disabled ? value : false) }
           className={ classes.join(' ') }
           disabled={ disabled }
-          label={ label }
-          hint={ hint }
           error={ error }
-          value={ text && account ? account.name : value }
+          hideUnderline={ hideUnderline }
+          hint={ hint }
+          label={ label }
           onChange={ this.handleInputChange }
           onSubmit={ onSubmit }
-          allowCopy={ allowCopy && (disabled ? value : false) }
-          hideUnderline={ hideUnderline }
-        />
+          value={
+            text && account
+              ? account.name
+              : value
+          } />
         { icon }
       </div>
     );
@@ -128,8 +133,8 @@ class InputAddress extends Component {
 }
 
 function mapStateToProps (state) {
-  const { accountsInfo } = state.personal;
   const { tokens } = state.balances;
+  const { accountsInfo } = state.personal;
 
   return {
     accountsInfo,
diff --git a/js/src/ui/MethodDecoding/methodDecoding.js b/js/src/ui/MethodDecoding/methodDecoding.js
index e02355ffb..fcf7f7513 100644
--- a/js/src/ui/MethodDecoding/methodDecoding.js
+++ b/js/src/ui/MethodDecoding/methodDecoding.js
@@ -17,16 +17,14 @@
 import BigNumber from 'bignumber.js';
 import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
-import { bindActionCreators } from 'redux';
 import CircularProgress from 'material-ui/CircularProgress';
 
-import Contracts from '~/contracts';
 import { Input, InputAddress } from '../Form';
+import MethodDecodingStore from './methodDecodingStore';
 
 import styles from './methodDecoding.css';
 
 const ASCII_INPUT = /^[a-z0-9\s,?;.:/!()-_@'"#]+$/i;
-const CONTRACT_CREATE = '0x60606040';
 const TOKEN_METHODS = {
   '0xa9059cbb': 'transfer(to,value)'
 };
@@ -38,19 +36,17 @@ class MethodDecoding extends Component {
 
   static propTypes = {
     address: PropTypes.string.isRequired,
-    tokens: PropTypes.object,
+    token: PropTypes.object,
     transaction: PropTypes.object,
     historic: PropTypes.bool
   }
 
   state = {
     contractAddress: null,
-    method: null,
     methodName: null,
     methodInputs: null,
     methodParams: null,
     methodSignature: null,
-    token: null,
     isContract: false,
     isDeploy: false,
     isReceived: false,
@@ -59,14 +55,29 @@ class MethodDecoding extends Component {
     inputType: 'auto'
   }
 
-  componentWillMount () {
-    const lookupResult = this.lookup();
+  methodDecodingStore = MethodDecodingStore.get(this.context.api);
 
-    if (typeof lookupResult === 'object' && typeof lookupResult.then === 'function') {
-      lookupResult.then(() => this.setState({ isLoading: false }));
-    } else {
-      this.setState({ isLoading: false });
-    }
+  componentWillMount () {
+    const { address, transaction } = this.props;
+
+    this
+      .methodDecodingStore
+      .lookup(address, transaction)
+      .then((lookup) => {
+        const newState = {
+          methodName: lookup.name,
+          methodInputs: lookup.inputs,
+          methodParams: lookup.params,
+          methodSignature: lookup.signature,
+
+          isContract: lookup.contract,
+          isDeploy: lookup.deploy,
+          isLoading: false,
+          isReceived: lookup.received
+        };
+
+        this.setState(newState);
+      });
   }
 
   render () {
@@ -116,7 +127,8 @@ class MethodDecoding extends Component {
   }
 
   renderAction () {
-    const { methodName, methodInputs, methodSignature, token, isDeploy, isReceived, isContract } = this.state;
+    const { token } = this.props;
+    const { methodName, methodInputs, methodSignature, isDeploy, isReceived, isContract } = this.state;
 
     if (isDeploy) {
       return this.renderDeploy();
@@ -378,7 +390,7 @@ class MethodDecoding extends Component {
   }
 
   renderTokenValue (value) {
-    const { token } = this.state;
+    const { token } = this.props;
 
     return (
       <span className={ styles.tokenValue }>
@@ -436,96 +448,18 @@ class MethodDecoding extends Component {
     });
   }
 
-  lookup () {
-    const { transaction } = this.props;
-
-    if (!transaction) {
-      return;
-    }
-
-    const { api } = this.context;
-    const { address, tokens } = this.props;
-
-    const isReceived = transaction.to === address;
-    const contractAddress = isReceived ? transaction.from : transaction.to;
-    const input = transaction.input || transaction.data;
-
-    const token = (tokens || {})[contractAddress];
-    this.setState({ token, isReceived, contractAddress });
-
-    if (!input || input === '0x') {
-      return;
-    }
-
-    const { signature, paramdata } = api.util.decodeCallData(input);
-    this.setState({ methodSignature: signature, methodParams: paramdata });
-
-    if (!signature || signature === CONTRACT_CREATE || transaction.creates) {
-      this.setState({ isDeploy: true });
-      return;
-    }
-
-    if (contractAddress === '0x') {
-      return;
-    }
-
-    return api.eth
-      .getCode(contractAddress || transaction.creates)
-      .then((bytecode) => {
-        const isContract = bytecode && /^(0x)?([0]*[1-9a-f]+[0]*)+$/.test(bytecode);
-
-        this.setState({ isContract });
-
-        if (!isContract) {
-          return;
-        }
-
-        return Contracts.get()
-          .signatureReg
-          .lookup(signature)
-          .then((method) => {
-            let methodInputs = null;
-            let methodName = null;
-
-            if (method && method.length) {
-              const { methodParams } = this.state;
-              const abi = api.util.methodToAbi(method);
-
-              methodName = abi.name;
-              methodInputs = api.util
-                .decodeMethodInput(abi, methodParams)
-                .map((value, index) => {
-                  const type = abi.inputs[index].type;
-
-                  return { type, value };
-                });
-            }
-
-            this.setState({
-              method,
-              methodName,
-              methodInputs,
-              bytecode
-            });
-          });
-      })
-      .catch((error) => {
-        console.warn('lookup', error);
-      });
-  }
 }
 
-function mapStateToProps (state) {
-  const { tokens } = state.balances;
+function mapStateToProps (initState, initProps) {
+  const { tokens } = initState.balances;
+  const { address } = initProps;
 
-  return { tokens };
+  const token = (tokens || {})[address];
+
+  return () => {
+    return { token };
+  };
 }
-
-function mapDispatchToProps (dispatch) {
-  return bindActionCreators({}, dispatch);
-}
-
 export default connect(
-  mapStateToProps,
-  mapDispatchToProps
+  mapStateToProps
 )(MethodDecoding);
diff --git a/js/src/ui/MethodDecoding/methodDecodingStore.js b/js/src/ui/MethodDecoding/methodDecodingStore.js
new file mode 100644
index 000000000..24433e541
--- /dev/null
+++ b/js/src/ui/MethodDecoding/methodDecodingStore.js
@@ -0,0 +1,216 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import Contracts from '~/contracts';
+import Abi from '~/abi';
+import * as abis from '~/contracts/abi';
+
+const CONTRACT_CREATE = '0x60606040';
+
+let instance = null;
+
+export default class MethodDecodingStore {
+
+  api = null;
+
+  _isContract = {};
+  _methods = {};
+
+  constructor (api, contracts = {}) {
+    this.api = api;
+
+    // Load the signatures from the local ABIs
+    Object.keys(abis).forEach((abiKey) => {
+      this.loadFromAbi(abis[abiKey]);
+    });
+
+    this.addContracts(contracts);
+  }
+
+  addContracts (contracts = {}) {
+    // Load the User defined contracts
+    Object.values(contracts).forEach((contract) => {
+      if (!contract || !contract.meta || !contract.meta.abi) {
+        return;
+      }
+      this.loadFromAbi(contract.meta.abi);
+    });
+  }
+
+  loadFromAbi (_abi) {
+    const abi = new Abi(_abi);
+    abi
+      .functions
+      .map((f) => ({ sign: f.signature, abi: f.abi }))
+      .forEach((mapping) => {
+        const sign = (/^0x/.test(mapping.sign) ? '' : '0x') + mapping.sign;
+        this._methods[sign] = mapping.abi;
+      });
+  }
+
+  static get (api, contracts = {}) {
+    if (!instance) {
+      instance = new MethodDecodingStore(api, contracts);
+    }
+
+    // Set API if not set yet
+    if (!instance.api) {
+      instance.api = api;
+    }
+
+    return instance;
+  }
+
+  static loadContracts (contracts = {}) {
+    if (!instance) {
+      // Just create the instance with null API
+      MethodDecodingStore.get(null, contracts);
+    } else {
+      instance.addContracts(contracts);
+    }
+  }
+
+  /**
+   * Looks up a transaction in the context of the given
+   * address
+   *
+   * @param  {String} address      The address contract
+   * @param  {Object} transaction  The transaction to lookup
+   * @return {Promise}             The result of the lookup. Resolves with:
+   *      {
+   *        contract: Boolean,
+   *        deploy: Boolean,
+   *        inputs: Array,
+   *        name: String,
+   *        params: Array,
+   *        received: Boolean,
+   *        signature: String
+   *      }
+   */
+  lookup (address, transaction) {
+    const result = {};
+
+    if (!transaction) {
+      return Promise.resolve(result);
+    }
+
+    const isReceived = transaction.to === address;
+    const contractAddress = isReceived ? transaction.from : transaction.to;
+    const input = transaction.input || transaction.data;
+
+    result.received = isReceived;
+
+    // No input, should be a ETH transfer
+    if (!input || input === '0x') {
+      return Promise.resolve(result);
+    }
+
+    const { signature, paramdata } = this.api.util.decodeCallData(input);
+    result.signature = signature;
+    result.params = paramdata;
+
+    // Contract deployment
+    if (!signature || signature === CONTRACT_CREATE || transaction.creates) {
+      return Promise.resolve({ ...result, deploy: true });
+    }
+
+    return this
+      .isContract(contractAddress || transaction.creates)
+      .then((isContract) => {
+        result.contract = isContract;
+
+        if (!isContract) {
+          return result;
+        }
+
+        return this
+          .fetchMethodAbi(signature)
+          .then((abi) => {
+            let methodName = null;
+            let methodInputs = null;
+
+            if (abi) {
+              methodName = abi.name;
+              methodInputs = this.api.util
+                .decodeMethodInput(abi, paramdata)
+                .map((value, index) => {
+                  const type = abi.inputs[index].type;
+                  return { type, value };
+                });
+            }
+
+            return {
+              ...result,
+              name: methodName,
+              inputs: methodInputs
+            };
+          });
+      })
+      .catch((error) => {
+        console.warn('lookup', error);
+      });
+  }
+
+  fetchMethodAbi (signature) {
+    if (this._methods[signature] !== undefined) {
+      return Promise.resolve(this._methods[signature]);
+    }
+
+    this._methods[signature] = Contracts.get()
+      .signatureReg
+      .lookup(signature)
+      .then((method) => {
+        let abi = null;
+
+        if (method && method.length) {
+          abi = this.api.util.methodToAbi(method);
+        }
+
+        this._methods[signature] = abi;
+        return this._methods[signature];
+      });
+
+    return Promise.resolve(this._methods[signature]);
+  }
+
+  /**
+   * Checks (and caches) if the given address is a
+   * Contract or not, from its fetched bytecode
+   */
+  isContract (contractAddress) {
+    // If zero address, it isn't a contract
+    if (/^(0x)?0*$/.test(contractAddress)) {
+      return Promise.resolve(false);
+    }
+
+    if (this._isContract[contractAddress]) {
+      return Promise.resolve(this._isContract[contractAddress]);
+    }
+
+    this._isContract[contractAddress] = this.api.eth
+      .getCode(contractAddress)
+      .then((bytecode) => {
+        // Is a contract if the address contains *valid* bytecode
+        const _isContract = bytecode && /^(0x)?([0]*[1-9a-f]+[0]*)+$/.test(bytecode);
+
+        this._isContract[contractAddress] = _isContract;
+        return this._isContract[contractAddress];
+      });
+
+    return Promise.resolve(this._isContract[contractAddress]);
+  }
+
+}
diff --git a/js/src/ui/Modal/modal.js b/js/src/ui/Modal/modal.js
index fd8e67aad..f72c3ffb1 100644
--- a/js/src/ui/Modal/modal.js
+++ b/js/src/ui/Modal/modal.js
@@ -42,11 +42,11 @@ class Modal extends Component {
     className: PropTypes.string,
     compact: PropTypes.bool,
     current: PropTypes.number,
-    waiting: PropTypes.array,
+    settings: PropTypes.object.isRequired,
     steps: PropTypes.array,
     title: nodeOrStringProptype(),
     visible: PropTypes.bool.isRequired,
-    settings: PropTypes.object.isRequired
+    waiting: PropTypes.array
   }
 
   render () {
@@ -55,23 +55,23 @@ class Modal extends Component {
     const contentStyle = muiTheme.parity.getBackgroundStyle(null, settings.backgroundSeed);
     const header = (
       <Title
-        current={ current }
         busy={ busy }
-        waiting={ waiting }
+        current={ current }
         steps={ steps }
-        title={ title } />
+        title={ title }
+        waiting={ waiting } />
     );
     const classes = `${styles.dialog} ${className}`;
 
     return (
       <Dialog
-        className={ classes }
         actions={ actions }
+        actionsContainerClassName={ styles.actions }
         actionsContainerStyle={ ACTIONS_STYLE }
         autoDetectWindowHeight={ false }
         autoScrollBodyContent
-        actionsContainerClassName={ styles.actions }
         bodyClassName={ styles.body }
+        className={ classes }
         contentClassName={ styles.content }
         contentStyle={ contentStyle }
         modal
@@ -82,7 +82,12 @@ class Modal extends Component {
         style={ DIALOG_STYLE }
         title={ header }
         titleStyle={ TITLE_STYLE }>
-        <Container light compact={ compact } style={ { transition: 'none' } }>
+        <Container
+          compact={ compact }
+          light
+          style={
+            { transition: 'none' }
+          }>
           { children }
         </Container>
       </Dialog>
diff --git a/js/src/views/Account/Transactions/transactions.js b/js/src/views/Account/Transactions/transactions.js
index b8b28208f..eb11e8def 100644
--- a/js/src/views/Account/Transactions/transactions.js
+++ b/js/src/views/Account/Transactions/transactions.js
@@ -19,7 +19,7 @@ import { connect } from 'react-redux';
 import { bindActionCreators } from 'redux';
 
 import etherscan from '~/3rdparty/etherscan';
-import { Container, TxList } from '~/ui';
+import { Container, TxList, Loading } from '~/ui';
 
 import styles from './transactions.css';
 
@@ -60,19 +60,32 @@ class Transactions extends Component {
   }
 
   render () {
-    const { address } = this.props;
-    const { hashes } = this.state;
-
     return (
       <Container title='transactions'>
-        <TxList
-          address={ address }
-          hashes={ hashes } />
+        { this.renderTransactionList() }
         { this.renderEtherscanFooter() }
       </Container>
     );
   }
 
+  renderTransactionList () {
+    const { address } = this.props;
+    const { hashes, loading } = this.state;
+
+    if (loading) {
+      return (
+        <Loading />
+      );
+    }
+
+    return (
+      <TxList
+        address={ address }
+        hashes={ hashes }
+      />
+    );
+  }
+
   renderEtherscanFooter () {
     const { traceMode } = this.props;
 
diff --git a/js/src/views/WriteContract/writeContract.css b/js/src/views/WriteContract/writeContract.css
index ca47e7332..2502c4060 100644
--- a/js/src/views/WriteContract/writeContract.css
+++ b/js/src/views/WriteContract/writeContract.css
@@ -32,6 +32,10 @@
   flex: 1;
   flex-direction: row;
 
+  // Fallback for browsers not supporting `calc`
+  min-height: 90vh;
+  min-height: calc(100vh - 8em);
+
   > * {
     margin: 0;
 
diff --git a/js/test/mocha.config.js b/js/test/mocha.config.js
index e90c91ebf..3201cd4ac 100644
--- a/js/test/mocha.config.js
+++ b/js/test/mocha.config.js
@@ -15,11 +15,13 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import 'isomorphic-fetch';
+import 'mock-local-storage';
 
 import es6Promise from 'es6-promise';
 es6Promise.polyfill();
 
-import 'mock-local-storage';
+import injectTapEventPlugin from 'react-tap-event-plugin';
+injectTapEventPlugin();
 
 import chai from 'chai';
 import chaiAsPromised from 'chai-as-promised';
diff --git a/rpc/src/v1/impls/signing.rs b/rpc/src/v1/impls/signing.rs
index 4ee44bb26..5fc6558da 100644
--- a/rpc/src/v1/impls/signing.rs
+++ b/rpc/src/v1/impls/signing.rs
@@ -18,7 +18,7 @@
 
 use std::sync::{Arc, Weak};
 use transient_hashmap::TransientHashMap;
-use util::{U256, Mutex};
+use util::{U256, Mutex, Hashable};
 
 use ethcore::account_provider::AccountProvider;
 use ethcore::miner::MinerService;
@@ -180,7 +180,8 @@ impl<C: 'static, M: 'static> EthSigning for SigningQueueClient<C, M> where
 	C: MiningBlockChainClient,
 	M: MinerService,
 {
-	fn sign(&self, ready: Ready<RpcH520>, address: RpcH160, hash: RpcH256) {
+	fn sign(&self, ready: Ready<RpcH520>, address: RpcH160, data: RpcBytes) {
+		let hash = data.0.sha3().into();
 		let res = self.active().and_then(|_| self.dispatch(RpcConfirmationPayload::Signature((address, hash).into())));
 		self.handle_dispatch(res, |response| {
 			match response {
diff --git a/rpc/src/v1/impls/signing_unsafe.rs b/rpc/src/v1/impls/signing_unsafe.rs
index 992bb85b0..2b3b81d57 100644
--- a/rpc/src/v1/impls/signing_unsafe.rs
+++ b/rpc/src/v1/impls/signing_unsafe.rs
@@ -17,6 +17,7 @@
 //! Unsafe Signing RPC implementation.
 
 use std::sync::{Arc, Weak};
+use util::Hashable;
 
 use ethcore::account_provider::AccountProvider;
 use ethcore::miner::MinerService;
@@ -83,7 +84,8 @@ impl<C: 'static, M: 'static> EthSigning for SigningUnsafeClient<C, M> where
 	C: MiningBlockChainClient,
 	M: MinerService,
 {
-	fn sign(&self, ready: Ready<RpcH520>, address: RpcH160, hash: RpcH256) {
+	fn sign(&self, ready: Ready<RpcH520>, address: RpcH160, data: RpcBytes) {
+		let hash = data.0.sha3().into();
 		let result = match self.handle(RpcConfirmationPayload::Signature((address, hash).into())) {
 			Ok(RpcConfirmationResponse::Signature(signature)) => Ok(signature),
 			Err(e) => Err(e),
diff --git a/rpc/src/v1/tests/helpers/sync_provider.rs b/rpc/src/v1/tests/helpers/sync_provider.rs
index 039ca4c3d..af87cd98c 100644
--- a/rpc/src/v1/tests/helpers/sync_provider.rs
+++ b/rpc/src/v1/tests/helpers/sync_provider.rs
@@ -105,13 +105,13 @@ impl SyncProvider for TestSyncProvider {
 				first_seen: 10,
 				propagated_to: map![
 					128.into() => 16
-				]
+				],
 			},
 			5.into() => TransactionStats {
 				first_seen: 16,
 				propagated_to: map![
 					16.into() => 1
-				]
+				],
 			}
 		]
 	}
diff --git a/rpc/src/v1/tests/mocked/eth.rs b/rpc/src/v1/tests/mocked/eth.rs
index f84f4d53e..ea8409ef2 100644
--- a/rpc/src/v1/tests/mocked/eth.rs
+++ b/rpc/src/v1/tests/mocked/eth.rs
@@ -18,11 +18,11 @@ use std::str::FromStr;
 use std::collections::HashMap;
 use std::sync::Arc;
 use std::time::{Instant, Duration};
-use rustc_serialize::hex::ToHex;
+use rustc_serialize::hex::{FromHex, ToHex};
 use time::get_time;
 use rlp;
 
-use util::{Uint, U256, Address, H256, FixedHash, Mutex};
+use util::{Uint, U256, Address, H256, FixedHash, Mutex, Hashable};
 use ethcore::account_provider::AccountProvider;
 use ethcore::client::{TestBlockChainClient, EachBlockWith, Executed, TransactionId};
 use ethcore::log_entry::{LocalizedLogEntry, LogEntry};
@@ -294,8 +294,8 @@ fn rpc_eth_sign() {
 
 	let account = tester.accounts_provider.new_account("abcd").unwrap();
 	tester.accounts_provider.unlock_account_permanently(account, "abcd".into()).unwrap();
-	let message = H256::from("0x0cc175b9c0f1b6a831c399e26977266192eb5ffee6ae2fec3ad71c777531578f");
-	let signed = tester.accounts_provider.sign(account, None, message).unwrap();
+	let message = "0cc175b9c0f1b6a831c399e26977266192eb5ffee6ae2fec3ad71c777531578f".from_hex().unwrap();
+	let signed = tester.accounts_provider.sign(account, None, message.sha3()).unwrap();
 
 	let req = r#"{
 		"jsonrpc": "2.0",
diff --git a/rpc/src/v1/tests/mocked/signing.rs b/rpc/src/v1/tests/mocked/signing.rs
index 526360f0f..5217ad402 100644
--- a/rpc/src/v1/tests/mocked/signing.rs
+++ b/rpc/src/v1/tests/mocked/signing.rs
@@ -26,7 +26,7 @@ use v1::types::ConfirmationResponse;
 use v1::tests::helpers::TestMinerService;
 use v1::tests::mocked::parity;
 
-use util::{Address, FixedHash, Uint, U256, H256, ToPretty};
+use util::{Address, FixedHash, Uint, U256, ToPretty, Hashable};
 use ethcore::account_provider::AccountProvider;
 use ethcore::client::TestBlockChainClient;
 use ethcore::transaction::{Transaction, Action};
@@ -186,11 +186,11 @@ fn should_check_status_of_request_when_its_resolved() {
 fn should_sign_if_account_is_unlocked() {
 	// given
 	let tester = eth_signing();
-	let hash: H256 = 5.into();
+	let data = vec![5u8];
 	let acc = tester.accounts.new_account("test").unwrap();
 	tester.accounts.unlock_account_permanently(acc, "test".into()).unwrap();
 
-	let signature = tester.accounts.sign(acc, None, hash).unwrap();
+	let signature = tester.accounts.sign(acc, None, data.sha3()).unwrap();
 
 	// when
 	let request = r#"{
@@ -198,7 +198,7 @@ fn should_sign_if_account_is_unlocked() {
 		"method": "eth_sign",
 		"params": [
 			""#.to_owned() + format!("0x{:?}", acc).as_ref() + r#"",
-			""# + format!("0x{:?}", hash).as_ref() + r#""
+			""# + format!("0x{}", data.to_hex()).as_ref() + r#""
 		],
 		"id": 1
 	}"#;
diff --git a/rpc/src/v1/traits/eth_signing.rs b/rpc/src/v1/traits/eth_signing.rs
index 4f8dc5b1b..aa306f3f0 100644
--- a/rpc/src/v1/traits/eth_signing.rs
+++ b/rpc/src/v1/traits/eth_signing.rs
@@ -17,14 +17,14 @@
 //! Eth rpc interface.
 
 use v1::helpers::auto_args::{WrapAsync, Ready};
-use v1::types::{H160, H256, H520, TransactionRequest, RichRawTransaction};
+use v1::types::{Bytes, H160, H256, H520, TransactionRequest, RichRawTransaction};
 
 build_rpc_trait! {
 	/// Signing methods implementation relying on unlocked accounts.
 	pub trait EthSigning {
-		/// Signs the data with given address signature.
+		/// Signs the hash of data with given address signature.
 		#[rpc(async, name = "eth_sign")]
-		fn sign(&self, Ready<H520>, H160, H256);
+		fn sign(&self, Ready<H520>, H160, Bytes);
 
 		/// Sends transaction; will block waiting for signer to return the
 		/// transaction hash.
diff --git a/rpc/src/v1/types/sync.rs b/rpc/src/v1/types/sync.rs
index 3e40ecb85..837b425d7 100644
--- a/rpc/src/v1/types/sync.rs
+++ b/rpc/src/v1/types/sync.rs
@@ -157,7 +157,7 @@ impl From<SyncTransactionStats> for TransactionStats {
 			propagated_to: s.propagated_to
 				.into_iter()
 				.map(|(id, count)| (id.into(), count))
-				.collect()
+				.collect(),
 		}
 	}
 }
@@ -208,7 +208,7 @@ mod tests {
 			first_seen: 100,
 			propagated_to: map![
 				10.into() => 50
-			]
+			],
 		};
 
 		let serialized = serde_json::to_string(&stats).unwrap();
diff --git a/sync/src/api.rs b/sync/src/api.rs
index b4a45c74d..8f03fbac8 100644
--- a/sync/src/api.rs
+++ b/sync/src/api.rs
@@ -144,7 +144,7 @@ pub struct EthSync {
 	network: NetworkService,
 	/// Main (eth/par) protocol handler
 	sync_handler: Arc<SyncProtocolHandler>,
-	/// Light (les) protocol handler 
+	/// Light (les) protocol handler
 	light_proto: Option<Arc<LightProtocol>>,
 	/// The main subprotocol name
 	subprotocol_name: [u8; 3],
@@ -155,7 +155,7 @@ pub struct EthSync {
 impl EthSync {
 	/// Creates and register protocol with the network service
 	pub fn new(params: Params) -> Result<Arc<EthSync>, NetworkError> {
-		let pruning_info = params.chain.pruning_info();		
+		let pruning_info = params.chain.pruning_info();
 		let light_proto = match params.config.serve_light {
 			false => None,
 			true => Some({
@@ -297,7 +297,7 @@ impl ChainNotify for EthSync {
 				Some(lp) => lp,
 				None => return,
 			};
-			
+
 			let chain_info = self.sync_handler.chain.chain_info();
 			light_proto.make_announcement(context, Announcement {
 				head_hash: chain_info.best_block_hash,
@@ -323,7 +323,7 @@ impl ChainNotify for EthSync {
 		// register the warp sync subprotocol
 		self.network.register_protocol(self.sync_handler.clone(), WARP_SYNC_PROTOCOL_ID, SNAPSHOT_SYNC_PACKET_COUNT, &[1u8])
 			.unwrap_or_else(|e| warn!("Error registering snapshot sync protocol: {:?}", e));
-		
+
 		// register the light protocol.
 		if let Some(light_proto) = self.light_proto.as_ref().map(|x| x.clone()) {
 			self.network.register_protocol(light_proto, self.light_subprotocol_name, ::light::net::PACKET_COUNT, ::light::net::PROTOCOL_VERSIONS)
@@ -335,6 +335,11 @@ impl ChainNotify for EthSync {
 		self.sync_handler.snapshot_service.abort_restore();
 		self.network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
 	}
+
+	fn transactions_received(&self, hashes: Vec<H256>, peer_id: PeerId) {
+		let mut sync = self.sync_handler.sync.write();
+		sync.transactions_received(hashes, peer_id);
+	}
 }
 
 /// LES event handler.
@@ -344,7 +349,7 @@ struct TxRelay(Arc<BlockChainClient>);
 impl LightHandler for TxRelay {
 	fn on_transactions(&self, ctx: &EventContext, relay: &[::ethcore::transaction::SignedTransaction]) {
 		trace!(target: "les", "Relaying {} transactions from peer {}", relay.len(), ctx.peer());
-		self.0.queue_transactions(relay.iter().map(|tx| ::rlp::encode(tx).to_vec()).collect())
+		self.0.queue_transactions(relay.iter().map(|tx| ::rlp::encode(tx).to_vec()).collect(), ctx.peer())
 	}
 }
 
@@ -547,4 +552,4 @@ pub struct ServiceConfiguration {
 	pub net: NetworkConfiguration,
 	/// IPC path.
 	pub io_path: String,
-}
\ No newline at end of file
+}
diff --git a/sync/src/chain.rs b/sync/src/chain.rs
index 7b9257c6c..350a42d0e 100644
--- a/sync/src/chain.rs
+++ b/sync/src/chain.rs
@@ -432,6 +432,13 @@ impl ChainSync {
 		self.transactions_stats.stats()
 	}
 
+	/// Updates transactions were received by a peer
+	pub fn transactions_received(&mut self, hashes: Vec<H256>, peer_id: PeerId) {
+		if let Some(mut peer_info) = self.peers.get_mut(&peer_id) {
+			peer_info.last_sent_transactions.extend(&hashes);
+		}
+	}
+
 	/// Abort all sync activity
 	pub fn abort(&mut self, io: &mut SyncIo) {
 		self.reset_and_continue(io);
@@ -1409,7 +1416,7 @@ impl ChainSync {
 			let tx = rlp.as_raw().to_vec();
 			transactions.push(tx);
 		}
-		io.chain().queue_transactions(transactions);
+		io.chain().queue_transactions(transactions, peer_id);
 		Ok(())
 	}
 
diff --git a/sync/src/transactions_stats.rs b/sync/src/transactions_stats.rs
index d5b78610d..03549fb3c 100644
--- a/sync/src/transactions_stats.rs
+++ b/sync/src/transactions_stats.rs
@@ -112,7 +112,7 @@ mod tests {
 			propagated_to: hash_map![
 				enodeid1 => 2,
 				enodeid2 => 1
-			]
+			],
 		}));
 	}
 
diff --git a/util/network/src/lib.rs b/util/network/src/lib.rs
index 5a06f5a22..8d85731b0 100644
--- a/util/network/src/lib.rs
+++ b/util/network/src/lib.rs
@@ -99,7 +99,7 @@ pub use stats::NetworkStats;
 pub use session::SessionInfo;
 
 use io::TimerToken;
-pub use node_table::is_valid_node_url;
+pub use node_table::{is_valid_node_url, NodeId};
 
 const PROTOCOL_VERSION: u32 = 4;