Merge remote-tracking branch 'origin/master' into check-updates

2016-12-11 15:43:28 +01:00 · 2016-12-11 15:43:28 +01:00 · 74a6203f72
commit 74a6203f72
parent 0e17cf8d3a 6724f574d6
61 changed files with 1264 additions and 504 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -1293,7 +1293,7 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#f982c84ac216cc4f99d056c912e205bcf9341602"
+source = "git+https://github.com/ethcore/js-precompiled.git#3e04f32403aab917a149d54f4191263f1c79f5ce"
 dependencies = [
 "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
--- a/ethcore/light/src/client.rs
+++ b/ethcore/light/src/client.rs
@ -14,8 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-//! Light client implementation. Used for raw data queries as well as the header
-//! sync.
+//! Light client implementation. Stores data from light sync

 use std::sync::Arc;

@ -29,7 +28,7 @@ use ethcore::transaction::SignedTransaction;
 use ethcore::blockchain_info::BlockChainInfo;

 use io::IoChannel;
-use util::hash::H256;
+use util::hash::{H256, H256FastMap};
 use util::{Bytes, Mutex};

 use provider::Provider;
@ -37,9 +36,10 @@ use request;

 /// Light client implementation.
 pub struct Client {
-	engine: Arc<Engine>,
+	_engine: Arc<Engine>,
 	header_queue: HeaderQueue,
-	message_channel: Mutex<IoChannel<ClientIoMessage>>,
+	_message_channel: Mutex<IoChannel<ClientIoMessage>>,
+	tx_pool: Mutex<H256FastMap<SignedTransaction>>,
 }

 impl Client {
@ -55,12 +55,17 @@ impl Client {
 		false
 	}

-	/// Fetch a vector of all pending transactions.
-	pub fn pending_transactions(&self) -> Vec<SignedTransaction> {
-		vec![]
+	/// Import a local transaction.
+	pub fn import_own_transaction(&self, tx: SignedTransaction) {
+		self.tx_pool.lock().insert(tx.hash(), tx);
 	} 

-	/// Inquire about the status of a given block.
+	/// Fetch a vector of all pending transactions.
+	pub fn pending_transactions(&self) -> Vec<SignedTransaction> {
+		self.tx_pool.lock().values().cloned().collect()
+	}
+
+	/// Inquire about the status of a given block (or header).
 	pub fn status(&self, _id: BlockId) -> BlockStatus {
 		BlockStatus::Unknown
 	}
--- a/ethcore/light/src/lib.rs
+++ b/ethcore/light/src/lib.rs
@ -28,8 +28,7 @@
 //! It starts by performing a header-only sync, verifying random samples
 //! of members of the chain to varying degrees.

-// TODO: remove when integrating with the rest of parity.
-#![allow(dead_code)]
+#![deny(missing_docs)]

 pub mod client;
 pub mod net;
--- a/ethcore/light/src/net/context.rs
+++ b/ethcore/light/src/net/context.rs
@ -26,95 +26,95 @@ use request::Request;
 /// 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 {
-    /// Send a packet to a specific peer.
-    fn send(&self, peer: PeerId, packet_id: u8, packet_body: Vec<u8>);
+	/// Send a packet to a specific peer.
+	fn send(&self, peer: PeerId, packet_id: u8, packet_body: Vec<u8>);

-    /// Respond to a peer's message. Only works if this context is a byproduct
-    /// of a packet handler.
-    fn respond(&self, packet_id: u8, packet_body: Vec<u8>);
+	/// Respond to a peer's message. Only works if this context is a byproduct
+	/// of a packet handler.
+	fn respond(&self, packet_id: u8, packet_body: Vec<u8>);

-    /// Disconnect a peer.
-    fn disconnect_peer(&self, peer: PeerId);
+	/// Disconnect a peer.
+	fn disconnect_peer(&self, peer: PeerId);

-    /// Disable a peer -- this is a disconnect + a time-out.
-    fn disable_peer(&self, peer: PeerId);
+	/// Disable a peer -- this is a disconnect + a time-out.
+	fn disable_peer(&self, peer: PeerId);

-    /// Get a peer's protocol version.
-    fn protocol_version(&self, peer: PeerId) -> Option<u8>;
+	/// Get a peer's protocol version.
+	fn protocol_version(&self, peer: PeerId) -> Option<u8>;
 }

 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) {
-            debug!(target: "les", "Error sending packet to peer {}: {}", peer, e);
-        }
-    }
+	fn send(&self, peer: PeerId, packet_id: u8, packet_body: Vec<u8>) {
+		if let Err(e) = self.send(peer, packet_id, packet_body) {
+			debug!(target: "les", "Error sending packet to peer {}: {}", peer, e);
+		}
+	}

-    fn respond(&self, packet_id: u8, packet_body: Vec<u8>) {
-        if let Err(e) = self.respond(packet_id, packet_body) {
-            debug!(target: "les", "Error responding to peer message: {}", e);
-        }
-    }
+	fn respond(&self, packet_id: u8, packet_body: Vec<u8>) {
+		if let Err(e) = self.respond(packet_id, packet_body) {
+			debug!(target: "les", "Error responding to peer message: {}", e);
+		}
+	}

-    fn disconnect_peer(&self, peer: PeerId) {
-        NetworkContext::disconnect_peer(self, peer);
-    }
+	fn disconnect_peer(&self, peer: PeerId) {
+		NetworkContext::disconnect_peer(self, peer);
+	}

-    fn disable_peer(&self, peer: PeerId) {
-        NetworkContext::disable_peer(self, peer);
-    }
+	fn disable_peer(&self, peer: PeerId) {
+		NetworkContext::disable_peer(self, peer);
+	}

-    fn protocol_version(&self, peer: PeerId) -> Option<u8> {
-        self.protocol_version(self.subprotocol_name(), peer)
-    }
+	fn protocol_version(&self, peer: PeerId) -> Option<u8> {
+		self.protocol_version(self.subprotocol_name(), peer)
+	}
 }

 /// Context for a protocol event.
 pub trait EventContext {
-    /// Get the peer relevant to the event e.g. message sender,
-    /// disconnected/connected peer.
-    fn peer(&self) -> PeerId;
+	/// Get the peer relevant to the event e.g. message sender,
+	/// disconnected/connected peer.
+	fn peer(&self) -> PeerId;

-    /// Make a request from a peer.
-    fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error>;
+	/// Make a request from a peer.
+	fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error>;

-    /// Make an announcement of new capabilities to the rest of the peers.
-    // TODO: maybe just put this on a timer in LightProtocol?
-    fn make_announcement(&self, announcement: Announcement);
+	/// Make an announcement of new capabilities to the rest of the peers.
+	// TODO: maybe just put this on a timer in LightProtocol?
+	fn make_announcement(&self, announcement: Announcement);

-    /// Disconnect a peer.
-    fn disconnect_peer(&self, peer: PeerId);
+	/// Disconnect a peer.
+	fn disconnect_peer(&self, peer: PeerId);

-    /// Disable a peer.
-    fn disable_peer(&self, peer: PeerId);
+	/// Disable a peer.
+	fn disable_peer(&self, peer: PeerId);
 }

 /// 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.
-    pub io: &'a IoContext,
-    /// Protocol implementation.
-    pub proto: &'a LightProtocol,
-    /// Relevant peer for event.
-    pub peer: PeerId, 
+	/// Io context to enable immediate response to events.
+	pub io: &'a IoContext,
+	/// Protocol implementation.
+	pub proto: &'a LightProtocol,
+	/// Relevant peer for event.
+	pub peer: PeerId, 
 }

 impl<'a> EventContext for Ctx<'a> {
-    fn peer(&self) -> PeerId { self.peer }
-    fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error> {
-        self.proto.request_from(self.io, &peer, request)
-    }
+	fn peer(&self) -> PeerId { self.peer }
+	fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error> {
+		self.proto.request_from(self.io, &peer, request)
+	}

-    fn make_announcement(&self, announcement: Announcement) {
-        self.proto.make_announcement(self.io, announcement);
-    }
+	fn make_announcement(&self, announcement: Announcement) {
+		self.proto.make_announcement(self.io, announcement);
+	}

-    fn disconnect_peer(&self, peer: PeerId) {
-        self.io.disconnect_peer(peer);
-    }
+	fn disconnect_peer(&self, peer: PeerId) {
+		self.io.disconnect_peer(peer);
+	}

-    fn disable_peer(&self, peer: PeerId) {
-        self.io.disable_peer(peer);
-    }
+	fn disable_peer(&self, peer: PeerId) {
+		self.io.disable_peer(peer);
+	}
 }
--- a/ethcore/light/src/net/mod.rs
+++ b/ethcore/light/src/net/mod.rs
@ -34,7 +34,7 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering};

 use provider::Provider;
-use request::{self, Request};
+use request::{self, HashOrNumber, Request};

 use self::buffer_flow::{Buffer, FlowParams};
 use self::context::Ctx;
@ -57,13 +57,13 @@ const TIMEOUT_INTERVAL_MS: u64 = 1000;
 // minimum interval between updates.
 const UPDATE_INTERVAL_MS: i64 = 5000;

-// Supported protocol versions.
+/// Supported protocol versions.
 pub const PROTOCOL_VERSIONS: &'static [u8] = &[1];

-// Max protocol version.
+/// Max protocol version.
 pub const MAX_PROTOCOL_VERSION: u8 = 1;

-// Packet count for LES.
+/// Packet count for LES.
 pub const PACKET_COUNT: u8 = 15;

 // packet ID definitions.
@ -102,6 +102,18 @@ mod packet {
 	pub const HEADER_PROOFS: u8 = 0x0e;
 }

+// timeouts for different kinds of requests. all values are in milliseconds.
+// TODO: variable timeouts based on request count.
+mod timeout {
+	pub const HANDSHAKE: i64 = 2500;
+	pub const HEADERS: i64 = 5000;
+	pub const BODIES: i64 = 5000;
+	pub const RECEIPTS: i64 = 3500;
+	pub const PROOFS: i64 = 4000;
+	pub const CONTRACT_CODES: i64 = 5000;
+	pub const HEADER_PROOFS: i64 = 3500;
+}
+
 /// A request id.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct ReqId(usize);
@ -111,7 +123,6 @@ pub struct ReqId(usize);
 struct PendingPeer {
 	sent_head: H256,
 	last_update: SteadyTime,
-	proto_version: u8,
 }

 // data about each peer.
@ -122,7 +133,6 @@ struct Peer {
 	remote_flow: Option<(Buffer, FlowParams)>,
 	sent_head: H256, // last head we've given them.
 	last_update: SteadyTime,
-	proto_version: u8,
 }

 impl Peer {
@ -443,17 +453,54 @@ impl LightProtocol {
 			}
 		};

-		// if something went wrong, figure out how much to punish the peer.
 		if let Err(e) = res {
-			match e.punishment() {
-				Punishment::None => {}
-				Punishment::Disconnect => {
-					debug!(target: "les", "Disconnecting peer {}: {}", peer, e);
-					io.disconnect_peer(*peer)
-				}
-				Punishment::Disable => {
-					debug!(target: "les", "Disabling peer {}: {}", peer, e);
-					io.disable_peer(*peer)
+			punish(*peer, io, e);
+		}
+	}
+
+	// check timeouts and punish peers.
+	fn timeout_check(&self, io: &IoContext) {
+		let now = SteadyTime::now();
+
+		// handshake timeout
+		{
+			let mut pending = self.pending_peers.write();
+			let slowpokes: Vec<_> = pending.iter()
+				.filter(|&(_, ref peer)| {
+					peer.last_update + Duration::milliseconds(timeout::HANDSHAKE) <= now
+				})
+				.map(|(&p, _)| p)
+				.collect();
+
+			for slowpoke in slowpokes {
+				debug!(target: "les", "Peer {} handshake timed out", slowpoke);
+				pending.remove(&slowpoke);
+				io.disconnect_peer(slowpoke);
+			}
+		}
+
+		// request timeouts
+		{
+			for r in self.pending_requests.read().values() {
+				let kind_timeout = match r.request.kind() {
+					request::Kind::Headers => timeout::HEADERS,
+					request::Kind::Bodies => timeout::BODIES,
+					request::Kind::Receipts => timeout::RECEIPTS,
+					request::Kind::StateProofs => timeout::PROOFS,
+					request::Kind::Codes => timeout::CONTRACT_CODES,
+					request::Kind::HeaderProofs => timeout::HEADER_PROOFS,					
+				};
+
+				if r.timestamp + Duration::milliseconds(kind_timeout) <= now {
+					debug!(target: "les", "Request for {:?} from peer {} timed out", 
+						r.request.kind(), r.peer_id);
+					
+					// keep the request in the `pending` set for now so
+					// on_disconnect will pass unfulfilled ReqIds to handlers.
+					// in the case that a response is received after this, the
+					// disconnect won't be cancelled but the ReqId won't be 
+					// marked as abandoned.
+					io.disconnect_peer(r.peer_id);
 				}
 			}
 		}
@ -463,19 +510,37 @@ impl LightProtocol {
 impl LightProtocol {
 	// called when a peer connects.
 	fn on_connect(&self, peer: &PeerId, io: &IoContext) {
-		let peer = *peer;
+		let proto_version = match io.protocol_version(*peer).ok_or(Error::WrongNetwork) {
+			Ok(pv) => pv,
+			Err(e) => { punish(*peer, io, e); return }
+		};

-		trace!(target: "les", "Peer {} connecting", peer);
-
-		match self.send_status(peer, io) {
-			Ok(pending_peer) => {
-				self.pending_peers.write().insert(peer, pending_peer);
-			}
-			Err(e) => {
-				trace!(target: "les", "Error while sending status: {}", e);
-				io.disconnect_peer(peer);
-			}
+		if PROTOCOL_VERSIONS.iter().find(|x| **x == proto_version).is_none() {
+			punish(*peer, io, Error::UnsupportedProtocolVersion(proto_version));
+			return;
 		}
+		
+		let chain_info = self.provider.chain_info();
+
+		let status = Status {
+			head_td: chain_info.total_difficulty,
+			head_hash: chain_info.best_block_hash,
+			head_num: chain_info.best_block_number,
+			genesis_hash: chain_info.genesis_hash,
+			protocol_version: proto_version as u32, // match peer proto version
+			network_id: self.network_id,
+			last_head: None,
+		};
+
+		let capabilities = self.capabilities.read().clone();
+		let status_packet = status::write_handshake(&status, &capabilities, Some(&self.flow_params));
+
+		self.pending_peers.write().insert(*peer, PendingPeer {
+			sent_head: chain_info.best_block_hash,
+			last_update: SteadyTime::now(),
+		});
+
+		io.send(*peer, packet::STATUS, status_packet);		
 	}

 	// called when a peer disconnects.
@ -508,38 +573,6 @@ impl LightProtocol {
 		}
 	}

-	// send status to a peer.
-	fn send_status(&self, peer: PeerId, io: &IoContext) -> Result<PendingPeer, Error> {
-		let proto_version = try!(io.protocol_version(peer).ok_or(Error::WrongNetwork));
-
-		if PROTOCOL_VERSIONS.iter().find(|x| **x == proto_version).is_none() {
-			return Err(Error::UnsupportedProtocolVersion(proto_version));
-		}
-		
-		let chain_info = self.provider.chain_info();
-
-		let status = Status {
-			head_td: chain_info.total_difficulty,
-			head_hash: chain_info.best_block_hash,
-			head_num: chain_info.best_block_number,
-			genesis_hash: chain_info.genesis_hash,
-			protocol_version: proto_version as u32, // match peer proto version
-			network_id: self.network_id,
-			last_head: None,
-		};
-
-		let capabilities = self.capabilities.read().clone();
-		let status_packet = status::write_handshake(&status, &capabilities, Some(&self.flow_params));
-
-		io.send(peer, packet::STATUS, status_packet);
-
-		Ok(PendingPeer {
-			sent_head: chain_info.best_block_hash,
-			last_update: SteadyTime::now(),
-			proto_version: proto_version,			
-		})
-	}
-
 	// Handle status message from peer.
 	fn status(&self, peer: &PeerId, io: &IoContext, data: UntrustedRlp) -> Result<(), Error> {
 		let pending = match self.pending_peers.write().remove(peer) {
@ -570,7 +603,6 @@ impl LightProtocol {
 			remote_flow: remote_flow,
 			sent_head: pending.sent_head,
 			last_update: pending.last_update,
-			proto_version: pending.proto_version,
 		}));

 		for handler in &self.handlers {
@ -645,18 +677,21 @@ impl LightProtocol {
 		let mut peer = peer.lock();

 		let req_id: u64 = try!(data.val_at(0));
+		let data = try!(data.at(1));

-		let block = {
-			let rlp = try!(data.at(1));
-			(try!(rlp.val_at(0)), try!(rlp.val_at(1)))
+		let start_block = {
+			if try!(data.at(0)).size() == 32 {
+				HashOrNumber::Hash(try!(data.val_at(0)))
+			} else {
+				HashOrNumber::Number(try!(data.val_at(0)))
+			}
 		};

 		let req = request::Headers {
-			block_num: block.0,
-			block_hash: block.1,
-			max: ::std::cmp::min(MAX_HEADERS, try!(data.val_at(2))),
-			skip: try!(data.val_at(3)),
-			reverse: try!(data.val_at(4)),
+			start: start_block,
+			max: ::std::cmp::min(MAX_HEADERS, try!(data.val_at(1))),
+			skip: try!(data.val_at(2)),
+			reverse: try!(data.val_at(3)),
 		};

 		let max_cost = try!(peer.deduct_max(&self.flow_params, request::Kind::Headers, req.max));
@ -667,8 +702,8 @@ impl LightProtocol {

 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);
 		io.respond(packet::BLOCK_HEADERS, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for header in response {
 				stream.append_raw(&header, 1);
@ -683,7 +718,7 @@ impl LightProtocol {
 	// Receive a response for block headers.
 	fn block_headers(&self, peer: &PeerId, io: &IoContext, raw: UntrustedRlp) -> Result<(), Error> {
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::Headers, &raw));
-		let raw_headers: Vec<_> = raw.iter().skip(2).map(|x| x.as_raw().to_owned()).collect();
+		let raw_headers: Vec<_> = try!(raw.at(2)).iter().map(|x| x.as_raw().to_owned()).collect();

 		for handler in &self.handlers {
 			handler.on_block_headers(&Ctx {
@ -713,7 +748,7 @@ impl LightProtocol {
 		let req_id: u64 = try!(data.val_at(0));

 		let req = request::Bodies {
-			block_hashes: try!(data.iter().skip(1).take(MAX_BODIES).map(|x| x.as_val()).collect())
+			block_hashes: try!(try!(data.at(1)).iter().take(MAX_BODIES).map(|x| x.as_val()).collect())
 		};

 		let max_cost = try!(peer.deduct_max(&self.flow_params, request::Kind::Bodies, req.block_hashes.len()));
@ -726,8 +761,8 @@ impl LightProtocol {
 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);

 		io.respond(packet::BLOCK_BODIES, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for body in response {
 				stream.append_raw(&body, 1);
@ -742,7 +777,7 @@ impl LightProtocol {
 	// Receive a response for block bodies.
 	fn block_bodies(&self, peer: &PeerId, io: &IoContext, raw: UntrustedRlp) -> Result<(), Error> {
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::Bodies, &raw));
-		let raw_bodies: Vec<Bytes> = raw.iter().skip(2).map(|x| x.as_raw().to_owned()).collect();
+		let raw_bodies: Vec<Bytes> = try!(raw.at(2)).iter().map(|x| x.as_raw().to_owned()).collect();

 		for handler in &self.handlers {
 			handler.on_block_bodies(&Ctx {
@ -772,7 +807,7 @@ impl LightProtocol {
 		let req_id: u64 = try!(data.val_at(0));

 		let req = request::Receipts {
-			block_hashes: try!(data.iter().skip(1).take(MAX_RECEIPTS).map(|x| x.as_val()).collect())
+			block_hashes: try!(try!(data.at(1)).iter().take(MAX_RECEIPTS).map(|x| x.as_val()).collect())
 		};

 		let max_cost = try!(peer.deduct_max(&self.flow_params, request::Kind::Receipts, req.block_hashes.len()));
@ -785,8 +820,8 @@ impl LightProtocol {
 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);

 		io.respond(packet::RECEIPTS, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for receipts in response {
 				stream.append_raw(&receipts, 1);
@ -801,9 +836,8 @@ impl LightProtocol {
 	// Receive a response for receipts.
 	fn receipts(&self, peer: &PeerId, io: &IoContext, raw: UntrustedRlp) -> Result<(), Error> {
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::Receipts, &raw));
-		let raw_receipts: Vec<Vec<Receipt>> = try!(raw
+		let raw_receipts: Vec<Vec<Receipt>> = try!(try!(raw.at(2))
 			.iter()
-			.skip(2)
 			.map(|x| x.as_val())
 			.collect());

@ -835,7 +869,7 @@ impl LightProtocol {
 		let req_id: u64 = try!(data.val_at(0));

 		let req = {
-			let requests: Result<Vec<_>, Error> = data.iter().skip(1).take(MAX_PROOFS).map(|x| {
+			let requests: Result<Vec<_>, Error> = try!(data.at(1)).iter().take(MAX_PROOFS).map(|x| {
 				Ok(request::StateProof {
 					block: try!(x.val_at(0)),
 					key1: try!(x.val_at(1)),
@ -859,8 +893,8 @@ impl LightProtocol {
 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);

 		io.respond(packet::PROOFS, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for proof in response {
 				stream.append_raw(&proof, 1);
@ -876,8 +910,7 @@ impl LightProtocol {
 	fn proofs(&self, peer: &PeerId, io: &IoContext, raw: UntrustedRlp) -> Result<(), Error> {
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::StateProofs, &raw));

-		let raw_proofs: Vec<Vec<Bytes>> = raw.iter()
-			.skip(2)
+		let raw_proofs: Vec<Vec<Bytes>> = try!(raw.at(2)).iter()
 			.map(|x| x.iter().map(|node| node.as_raw().to_owned()).collect())
 			.collect();

@ -909,7 +942,7 @@ impl LightProtocol {
 		let req_id: u64 = try!(data.val_at(0));

 		let req = {
-			let requests: Result<Vec<_>, Error> = data.iter().skip(1).take(MAX_CODES).map(|x| {
+			let requests: Result<Vec<_>, Error> = try!(data.at(1)).iter().take(MAX_CODES).map(|x| {
 				Ok(request::ContractCode {
 					block_hash: try!(x.val_at(0)),
 					account_key: try!(x.val_at(1)),
@ -931,8 +964,8 @@ impl LightProtocol {
 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);

 		io.respond(packet::CONTRACT_CODES, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for code in response {
 				stream.append(&code);
@ -948,7 +981,7 @@ impl LightProtocol {
 	fn contract_code(&self, peer: &PeerId, io: &IoContext, raw: UntrustedRlp) -> Result<(), Error> {
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::Codes, &raw));

-		let raw_code: Vec<Bytes> = try!(raw.iter().skip(2).map(|x| x.as_val()).collect());
+		let raw_code: Vec<Bytes> = try!(try!(raw.at(2)).iter().map(|x| x.as_val()).collect());

 		for handler in &self.handlers { 
 			handler.on_code(&Ctx {
@ -978,7 +1011,7 @@ impl LightProtocol {
 		let req_id: u64 = try!(data.val_at(0));

 		let req = {
-			let requests: Result<Vec<_>, Error> = data.iter().skip(1).take(MAX_PROOFS).map(|x| {
+			let requests: Result<Vec<_>, Error> = try!(data.at(1)).iter().take(MAX_PROOFS).map(|x| {
 				Ok(request::HeaderProof {
 					cht_number: try!(x.val_at(0)),
 					block_number: try!(x.val_at(1)),
@ -1001,8 +1034,8 @@ impl LightProtocol {
 		let cur_buffer = peer.refund(&self.flow_params, max_cost - actual_cost);

 		io.respond(packet::HEADER_PROOFS, {
-			let mut stream = RlpStream::new_list(response.len() + 2);
-			stream.append(&req_id).append(&cur_buffer);
+			let mut stream = RlpStream::new_list(3);
+			stream.append(&req_id).append(&cur_buffer).begin_list(response.len());

 			for proof in response {
 				stream.append_raw(&proof, 1);
@ -1023,9 +1056,8 @@ impl LightProtocol {
 			))
 		}
 		
-		
 		let req_id = try!(self.pre_verify_response(peer, request::Kind::HeaderProofs, &raw));
-		let raw_proofs: Vec<_> = try!(raw.iter().skip(2).map(decode_res).collect());
+		let raw_proofs: Vec<_> = try!(try!(raw.at(2)).iter().map(decode_res).collect());

 		for handler in &self.handlers { 
 			handler.on_header_proofs(&Ctx {
@ -1058,6 +1090,21 @@ impl LightProtocol {
 	}
 }

+// if something went wrong, figure out how much to punish the peer.
+fn punish(peer: PeerId, io: &IoContext, e: Error) {
+	match e.punishment() {
+		Punishment::None => {}
+		Punishment::Disconnect => {
+			debug!(target: "les", "Disconnecting peer {}: {}", peer, e);
+			io.disconnect_peer(peer)
+		}
+		Punishment::Disable => {
+			debug!(target: "les", "Disabling peer {}: {}", peer, e);
+			io.disable_peer(peer)
+		}
+	}
+}
+
 impl NetworkProtocolHandler for LightProtocol {
 	fn initialize(&self, io: &NetworkContext) {
 		io.register_timer(TIMEOUT, TIMEOUT_INTERVAL_MS).expect("Error registering sync timer.");
@ -1075,11 +1122,9 @@ impl NetworkProtocolHandler for LightProtocol {
 		self.on_disconnect(*peer, io);
 	}

-	fn timeout(&self, _io: &NetworkContext, timer: TimerToken) {
+	fn timeout(&self, io: &NetworkContext, timer: TimerToken) {
 		match timer {
-			TIMEOUT => {
-				// broadcast transactions to peers.
-			}
+			TIMEOUT => self.timeout_check(io),
 			_ => warn!(target: "les", "received timeout on unknown token {}", timer),
 		}
 	}
@ -1089,20 +1134,24 @@ impl NetworkProtocolHandler for LightProtocol {
 fn encode_request(req: &Request, req_id: usize) -> Vec<u8> {
 	match *req {
 		Request::Headers(ref headers) => {
-			let mut stream = RlpStream::new_list(5);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(4);
+				
+			match headers.start {
+				HashOrNumber::Hash(ref hash) => stream.append(hash),
+				HashOrNumber::Number(ref num) => stream.append(num),
+			};
+			
 			stream
-				.append(&req_id)
-				.begin_list(2)
-					.append(&headers.block_num)
-					.append(&headers.block_hash)
 				.append(&headers.max)
 				.append(&headers.skip)
 				.append(&headers.reverse);
+
 			stream.out()
 		}
 		Request::Bodies(ref request) => {
-			let mut stream = RlpStream::new_list(request.block_hashes.len() + 1);
-			stream.append(&req_id);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(request.block_hashes.len());

 			for hash in &request.block_hashes {
 				stream.append(hash);
@ -1111,8 +1160,8 @@ fn encode_request(req: &Request, req_id: usize) -> Vec<u8> {
 			stream.out()
 		}
 		Request::Receipts(ref request) => {
-			let mut stream = RlpStream::new_list(request.block_hashes.len() + 1);
-			stream.append(&req_id);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(request.block_hashes.len());

 			for hash in &request.block_hashes {
 				stream.append(hash);
@ -1121,8 +1170,8 @@ fn encode_request(req: &Request, req_id: usize) -> Vec<u8> {
 			stream.out()
 		}
 		Request::StateProofs(ref request) => {
-			let mut stream = RlpStream::new_list(request.requests.len() + 1);
-			stream.append(&req_id);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(request.requests.len());

 			for proof_req in &request.requests {
 				stream.begin_list(4)
@ -1140,8 +1189,8 @@ fn encode_request(req: &Request, req_id: usize) -> Vec<u8> {
 			stream.out()
 		}
 		Request::Codes(ref request) => {
-			let mut stream = RlpStream::new_list(request.code_requests.len() + 1);
-			stream.append(&req_id);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(request.code_requests.len());

 			for code_req in &request.code_requests {
 				stream.begin_list(2)
@ -1152,8 +1201,8 @@ fn encode_request(req: &Request, req_id: usize) -> Vec<u8> {
 			stream.out()
 		}
 		Request::HeaderProofs(ref request) => {
-			let mut stream = RlpStream::new_list(request.requests.len() + 1);
-			stream.append(&req_id);
+			let mut stream = RlpStream::new_list(2);
+			stream.append(&req_id).begin_list(request.requests.len());

 			for proof_req in &request.requests {
 				stream.begin_list(3)
--- a/ethcore/light/src/net/tests/mod.rs
+++ b/ethcore/light/src/net/tests/mod.rs
@ -91,16 +91,27 @@ impl Provider for TestProvider {
 	}

 	fn block_headers(&self, req: request::Headers) -> Vec<Bytes> {
-		let best_num = self.0.client.chain_info().best_block_number;
-		let start_num = req.block_num;
+		use request::HashOrNumber;
+		use ethcore::views::HeaderView;

-		match self.0.client.block_hash(BlockId::Number(req.block_num)) {
-			Some(hash) if hash == req.block_hash => {}
-			_=> {
-				trace!(target: "les_provider", "unknown/non-canonical start block in header request: {:?}", (req.block_num, req.block_hash));
-				return vec![]
+		let best_num = self.chain_info().best_block_number;
+		let start_num = match req.start {
+			HashOrNumber::Number(start_num) => start_num,
+			HashOrNumber::Hash(hash) => match self.0.client.block_header(BlockId::Hash(hash)) {
+				None => {
+					return Vec::new();
+				}
+				Some(header) => {
+					let num = HeaderView::new(&header).number();
+					if req.max == 1 || self.0.client.block_hash(BlockId::Number(num)) != Some(hash) {
+						// Non-canonical header or single header requested.
+						return vec![header];
+					}
+
+					num
+				}
 			}
-		}
+		};

 		(0u64..req.max as u64)
 			.map(|x: u64| x.saturating_mul(req.skip + 1))
@ -250,8 +261,7 @@ fn buffer_overflow() {

 	// 1000 requests is far too many for the default flow params.
 	let request = encode_request(&Request::Headers(Headers {
-		block_num: 1,
-		block_hash: provider.client.chain_info().genesis_hash,
+		start: 1.into(),
 		max: 1000,
 		skip: 0,
 		reverse: false,
@ -284,8 +294,7 @@ fn get_block_headers() {
 	}

 	let request = Headers {
-		block_num: 1,
-		block_hash: provider.client.block_hash(BlockId::Number(1)).unwrap(),
+		start: 1.into(),
 		max: 10,
 		skip: 0,
 		reverse: false,
@ -299,9 +308,9 @@ 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(12);
+		let mut response_stream = RlpStream::new_list(3);
 		
-		response_stream.append(&req_id).append(&new_buf);
+		response_stream.append(&req_id).append(&new_buf).begin_list(10);
 		for header in headers {
 			response_stream.append_raw(&header, 1);
 		}
@ -346,9 +355,9 @@ 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(12);
+		let mut response_stream = RlpStream::new_list(3);
 		
-		response_stream.append(&req_id).append(&new_buf);
+		response_stream.append(&req_id).append(&new_buf).begin_list(10);
 		for body in bodies {
 			response_stream.append_raw(&body, 1);
 		}
@ -399,9 +408,9 @@ 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(2 + receipts.len());
+		let mut response_stream = RlpStream::new_list(3);
 		
-		response_stream.append(&req_id).append(&new_buf);
+		response_stream.append(&req_id).append(&new_buf).begin_list(receipts.len());
 		for block_receipts in receipts {
 			response_stream.append_raw(&block_receipts, 1);
 		}
@ -448,9 +457,9 @@ 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(4);
+		let mut response_stream = RlpStream::new_list(3);
 		
-		response_stream.append(&req_id).append(&new_buf);
+		response_stream.append(&req_id).append(&new_buf).begin_list(2);
 		for proof in proofs {
 			response_stream.append_raw(&proof, 1);
 		}
@ -497,9 +506,9 @@ 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(4);
+		let mut response_stream = RlpStream::new_list(3);
 		
-		response_stream.append(&req_id).append(&new_buf);
+		response_stream.append(&req_id).append(&new_buf).begin_list(2);
 		for code in codes {
 			response_stream.append(&code);
 		}
--- a/ethcore/light/src/provider.rs
+++ b/ethcore/light/src/provider.rs
@ -97,16 +97,28 @@ impl<T: ProvingBlockChainClient + ?Sized> Provider for T {
 	}

 	fn block_headers(&self, req: request::Headers) -> Vec<Bytes> {
-		let best_num = self.chain_info().best_block_number;
-		let start_num = req.block_num;
+		use request::HashOrNumber;
+		use ethcore::views::HeaderView;

-		match self.block_hash(BlockId::Number(req.block_num)) {
-			Some(hash) if hash == req.block_hash => {}
-			_=> {
-				trace!(target: "les_provider", "unknown/non-canonical start block in header request: {:?}", (req.block_num, req.block_hash));
-				return vec![]
+		let best_num = self.chain_info().best_block_number;
+		let start_num = match req.start {
+			HashOrNumber::Number(start_num) => start_num,
+			HashOrNumber::Hash(hash) => match self.block_header(BlockId::Hash(hash)) {
+				None => {
+					trace!(target: "les_provider", "Unknown block hash {} requested", hash);
+					return Vec::new();
+				}
+				Some(header) => {
+					let num = HeaderView::new(&header).number();
+					if req.max == 1 || self.block_hash(BlockId::Number(num)) != Some(hash) {
+						// Non-canonical header or single header requested.
+						return vec![header];
+					}
+
+					num
+				}
 			}
-		}
+		};
 		
 		(0u64..req.max as u64)
 			.map(|x: u64| x.saturating_mul(req.skip + 1))
--- a/ethcore/light/src/types/les_request.rs
+++ b/ethcore/light/src/types/les_request.rs
@ -18,15 +18,34 @@

 use util::H256;

+/// Either a hash or a number.
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "ipc", derive(Binary))]
+pub enum HashOrNumber {
+	/// Block hash variant.
+	Hash(H256),
+	/// Block number variant.
+	Number(u64),
+}
+
+impl From<H256> for HashOrNumber {
+	fn from(hash: H256) -> Self {
+		HashOrNumber::Hash(hash)
+	}
+}
+
+impl From<u64> for HashOrNumber {
+	fn from(num: u64) -> Self {
+		HashOrNumber::Number(num)
+	}
+}
+
 /// A request for block headers.
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "ipc", derive(Binary))]
 pub struct Headers {
-	/// Starting block number
-	pub block_num: u64,
-	/// Starting block hash. This and number could be combined but IPC codegen is
-	/// not robust enough to support it.
-	pub block_hash: H256,
+	/// Starting block number or hash.
+	pub start: HashOrNumber,
 	/// The maximum amount of headers which can be returned.
 	pub max: usize,
 	/// The amount of headers to skip between each response entry.
--- a/ethcore/src/block.rs
+++ b/ethcore/src/block.rs
@ -266,7 +266,8 @@ impl<'x> OpenBlock<'x> {
 		r.block.base.header.set_extra_data(extra_data);
 		r.block.base.header.note_dirty();

-		engine.populate_from_parent(&mut r.block.base.header, parent, gas_range_target.0, gas_range_target.1);
+		let gas_floor_target = ::std::cmp::max(gas_range_target.0, engine.params().min_gas_limit);
+		engine.populate_from_parent(&mut r.block.base.header, parent, gas_floor_target, gas_range_target.1);
 		engine.on_new_block(&mut r.block);
 		Ok(r)
 	}
--- a/ethcore/src/engines/mod.rs
+++ b/ethcore/src/engines/mod.rs
@ -125,8 +125,9 @@ pub trait Engine : Sync + Send {
 		self.verify_block_basic(header, None).and_then(|_| self.verify_block_unordered(header, None))
 	}

-	/// Don't forget to call Super::populate_from_parent when subclassing & overriding.
-	// TODO: consider including State in the params.
+	/// Populate a header's fields based on its parent's header.
+	/// Takes gas floor and ceiling targets.
+	/// The gas floor target must not be lower than the engine's minimum gas limit.
 	fn populate_from_parent(&self, header: &mut Header, parent: &Header, _gas_floor_target: U256, _gas_ceil_target: U256) {
 		header.set_difficulty(parent.difficulty().clone());
 		header.set_gas_limit(parent.gas_limit().clone());
--- a/js/npm/etherscan/README.md
+++ b/js/npm/etherscan/README.md
@ -0,0 +1,34 @@
+# @parity/etherscan
+
+A thin, lightweight promise wrapper for the api.etherscan.io/apis service, exposing a common endpoint for use in JavaScript applications.
+
+[https://github.com/ethcore/parity/tree/master/js/src/3rdparty/etherscan](https://github.com/ethcore/parity/tree/master/js/src/3rdparty/etherscan)
+
+## usage
+
+installation -
+
+```
+npm install --save @parity/etherscan
+```
+
+Usage -
+
+```
+const etherscan = require('@parity/etherscan');
+
+// api calls goes here
+```
+
+## api
+
+account (exposed on etherscan.account) -
+
+- `balance(address)`
+- `balances(addresses)` (array or addresses)
+- `transactions(address, page)` (page offset starts at 0, returns 25)
+
+stats (exposed on etherscan.stats) -
+
+- `price()`
+- `supply()`
--- a/js/npm/etherscan/package.json
+++ b/js/npm/etherscan/package.json
@ -0,0 +1,33 @@
+{
+  "name": "@parity/etherscan",
+  "description": "The Parity Promise-based library for interfacing with Etherscan over HTTP",
+  "version": "0.0.0",
+  "main": "library.js",
+  "author": "Parity Team <admin@parity.io>",
+  "maintainers": [
+    "Jaco Greeff"
+  ],
+  "contributors": [],
+  "license": "GPL-3.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ethcore/parity.git"
+  },
+  "keywords": [
+    "Ethereum",
+    "ABI",
+    "API",
+    "RPC",
+    "Parity",
+    "Promise"
+  ],
+  "scripts": {
+  },
+  "devDependencies": {
+    "chai": "3.5.0",
+    "mocha": "3.2.0"
+  },
+  "dependencies": {
+    "node-fetch": "~1.6.3"
+  }
+}
--- a/js/npm/parity/README.md
+++ b/js/npm/parity/README.md
@ -1,7 +1,9 @@
-# parity.js
+# @parity/parity.js

 Parity.js is a thin, fast, Promise-based wrapper around the Ethereum APIs.

+[https://github.com/ethcore/parity/tree/master/js/src/api](https://github.com/ethcore/parity/tree/master/js/src/api)
+
 ## installation

 Install the package with `npm install --save @parity/parity.js`
--- a/js/npm/parity/package.json
+++ b/js/npm/parity/package.json
@ -1,6 +1,6 @@
 {
  "name": "@parity/parity.js",
-  "description": "The Parity Promise-base API & ABI library for interfacing with Ethereum over RPC",
+  "description": "The Parity Promise-based API & ABI library for interfacing with Ethereum over RPC",
  "version": "0.0.0",
  "main": "library.js",
  "author": "Parity Team <admin@parity.io>",
@ -26,8 +26,8 @@
  "devDependencies": {
  },
  "dependencies": {
-    "bignumber.js": "^2.3.0",
-    "js-sha3": "^0.5.2",
-    "node-fetch": "^1.6.3"
+    "bignumber.js": "~2.3.0",
+    "js-sha3": "~0.5.2",
+    "node-fetch": "~1.6.3"
  }
 }
--- a/js/npm/parity/test/smoke.spec.js
+++ b/js/npm/parity/test/smoke.spec.js
@ -0,0 +1,26 @@
+// 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/>.
+
+const parity = require('../');
+
+describe('load the Parity library', function () {
+  it('should no throw any error', () => {
+    expect(parity).to.be.ok;
+
+    expect(parity.Api).to.be.ok;
+    expect(parity.Abi).to.be.ok;
+  });
+});
--- a/js/npm/shapeshift/README.md
+++ b/js/npm/shapeshift/README.md
@ -0,0 +1,34 @@
+# @parity/shapeshift
+
+A thin ES6 promise wrapper around the shapeshift.io APIs as documented at https://shapeshift.io/api
+
+[https://github.com/ethcore/parity/tree/master/js/src/3rdparty/shapeshift](https://github.com/ethcore/parity/tree/master/js/src/3rdparty/shapeshift)
+
+## usage
+
+installation -
+
+```
+npm install --save @parity/shapeshift
+```
+
+Usage -
+
+```
+const APIKEY = 'private affiliate key or undefined';
+const shapeshift = require('@parity/shapeshift')(APIKEY);
+
+// api calls goes here
+```
+
+## api
+
+queries -
+
+- `getCoins()` [https://shapeshift.io/api#api-104](https://shapeshift.io/api#api-104)
+- `getMarketInfo(pair)` [https://shapeshift.io/api#api-103](https://shapeshift.io/api#api-103)
+- `getStatus(depositAddress)` [https://shapeshift.io/api#api-5](https://shapeshift.io/api#api-5)
+
+transactions -
+
+- `shift(toAddress, returnAddress, pair)` [https://shapeshift.io/api#api-7](https://shapeshift.io/api#api-7)
--- a/js/npm/shapeshift/package.json
+++ b/js/npm/shapeshift/package.json
@ -0,0 +1,31 @@
+{
+  "name": "@parity/shapeshift",
+  "description": "The Parity Promise-based library for interfacing with ShapeShift over HTTP",
+  "version": "0.0.0",
+  "main": "library.js",
+  "author": "Parity Team <admin@parity.io>",
+  "maintainers": [
+    "Jaco Greeff"
+  ],
+  "contributors": [],
+  "license": "GPL-3.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ethcore/parity.git"
+  },
+  "keywords": [
+    "Ethereum",
+    "ABI",
+    "API",
+    "RPC",
+    "Parity",
+    "Promise"
+  ],
+  "scripts": {
+  },
+  "devDependencies": {
+  },
+  "dependencies": {
+    "node-fetch": "~1.6.3"
+  }
+}
--- a/js/npm/test/mocha.config.js
+++ b/js/npm/test/mocha.config.js
@ -0,0 +1,29 @@
+// 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/>.
+
+const chai = require('chai');
+// const chaiAsPromised from 'chai-as-promised';
+// const chaiEnzyme from 'chai-enzyme';
+// const sinonChai from 'sinon-chai';
+
+// chai.use(chaiAsPromised);
+// chai.use(chaiEnzyme());
+// chai.use(sinonChai);
+
+// expose expect to global so we won't have to manually import & define it in every test
+global.expect = chai.expect;
+
+module.exports = {};
--- a/js/npm/test/mocha.opts
+++ b/js/npm/test/mocha.opts
@ -0,0 +1 @@
+-r ./test/mocha.config
--- a/js/package.json
+++ b/js/package.json
@ -1,6 +1,6 @@
 {
  "name": "parity.js",
-  "version": "0.2.107",
+  "version": "0.2.111",
  "main": "release/index.js",
  "jsnext:main": "src/index.js",
  "author": "Parity Team <admin@parity.io>",
@ -43,7 +43,7 @@
    "test": "NODE_ENV=test mocha 'src/**/*.spec.js'",
    "test:coverage": "NODE_ENV=test istanbul cover _mocha -- 'src/**/*.spec.js'",
    "test:e2e": "NODE_ENV=test mocha 'src/**/*.e2e.js'",
-    "test:npm": "(cd .npmjs && npm i) && node test/npmLibrary && (rm -rf .npmjs/node_modules)",
+    "test:npm": "(cd .npmjs && npm i) && node test/npmParity && (rm -rf .npmjs/node_modules)",
    "prepush": "npm run lint:cached"
  },
  "devDependencies": {
@ -59,6 +59,7 @@
    "babel-plugin-transform-runtime": "6.15.0",
    "babel-plugin-webpack-alias": "2.1.2",
    "babel-polyfill": "6.20.0",
+    "babel-preset-env": "1.0.2",
    "babel-preset-es2015": "6.18.0",
    "babel-preset-es2016": "6.16.0",
    "babel-preset-es2017": "6.16.0",
--- a/js/scripts/dryrun-npm.sh
+++ b/js/scripts/dryrun-npm.sh
@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+# variables
+PACKAGES=( "parity" "etherscan" "shapeshift" )
+
+# change into the build directory
+BASEDIR=`dirname $0`
+cd $BASEDIR/..
+
+# build all packages
+echo "*** Building packages for npmjs"
+echo "$NPM_TOKEN" >> ~/.npmrc
+
+for PACKAGE in ${PACKAGES[@]}
+do
+  echo "*** Building $PACKAGE"
+  LIBRARY=$PACKAGE npm run ci:build:npm
+  DIRECTORY=.npmjs/$PACKAGE
+
+  cd $DIRECTORY
+  echo "*** Executing $PACKAGE tests from $DIRECTORY"
+  npm test
+
+  echo "*** Publishing $PACKAGE from $DIRECTORY"
+  echo "npm publish --access public || true"
+  cd ../..
+
+done
+cd ..
+
+# exit with exit code
+exit 0
--- a/js/scripts/release.sh
+++ b/js/scripts/release.sh
@ -3,7 +3,7 @@ set -e

 # variables
 UTCDATE=`date -u "+%Y%m%d-%H%M%S"`
-PACKAGES=( "parity.js" )
+PACKAGES=( "parity" "etherscan" "shapeshift" )
 BRANCH=$CI_BUILD_REF_NAME
 GIT_JS_PRECOMPILED="https://${GITHUB_JS_PRECOMPILED}:@github.com/ethcore/js-precompiled.git"
 GIT_PARITY="https://${GITHUB_JS_PRECOMPILED}:@github.com/ethcore/parity.git"
@ -59,19 +59,27 @@ git reset --hard origin/$BRANCH 2>$GITLOG

 if [ "$BRANCH" == "master" ]; then
  cd js
+
  echo "*** Bumping package.json patch version"
  npm --no-git-tag-version version
  npm version patch

  echo "*** Building packages for npmjs"
-  # echo -e "$NPM_USERNAME\n$NPM_PASSWORD\n$NPM_EMAIL" | npm login
  echo "$NPM_TOKEN" >> ~/.npmrc
-  npm run ci:build:npm

-  echo "*** Publishing $PACKAGE to npmjs"
-  cd .npmjs
-  npm publish --access public || true
-  cd ../..
+  for PACKAGE in ${PACKAGES[@]}
+  do
+    echo "*** Building $PACKAGE"
+    LIBRARY=$PACKAGE npm run ci:build:npm
+    DIRECTORY=.npmjs/$PACKAGE
+
+    echo "*** Publishing $PACKAGE from $DIRECTORY"
+    cd $DIRECTORY
+    npm publish --access public || true
+    cd ../..
+  done
+
+  cd ..
 fi

 echo "*** Updating cargo parity-ui-precompiled#$PRECOMPILED_HASH"
--- a/js/src/3rdparty/etherscan/account.spec.js
+++ b/js/src/3rdparty/etherscan/account.spec.js
@ -14,11 +14,13 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-import etherscan from './';
+const etherscan = require('./');

 const TESTADDR = '0xbf885e2b55c6bcc84556a3c5f07d3040833c8d00';

-describe.skip('etherscan/account', () => {
+describe.skip('etherscan/account', function () {
+  this.timeout(60 * 1000);
+
  const checkBalance = function (balance, addr) {
    expect(balance).to.be.ok;
    expect(balance.account).to.equal(addr);
--- a/js/src/3rdparty/etherscan/stats.spec.js
+++ b/js/src/3rdparty/etherscan/stats.spec.js
@ -14,9 +14,11 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-import etherscan from './';
+const etherscan = require('./');
+
+describe.skip('etherscan/stats', function () {
+  this.timeout(60 * 1000);

-describe.skip('etherscan/stats', () => {
  it('retrieves the latest price', () => {
    return etherscan.stats
      .price()
--- a/js/src/3rdparty/shapeshift/helpers.spec.js
+++ b/js/src/3rdparty/shapeshift/helpers.spec.js
@ -14,22 +14,15 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-import chai from 'chai';
-import nock from 'nock';
+const nock = require('nock');

-global.expect = chai.expect; // eslint-disable-line no-undef
-
-import 'isomorphic-fetch';
-import es6Promise from 'es6-promise';
-es6Promise.polyfill();
-
-import initShapeshift from './';
-import initRpc from './rpc';
+const ShapeShift = require('./');
+const initShapeshift = (ShapeShift.default || ShapeShift);

 const APIKEY = '0x123454321';

 const shapeshift = initShapeshift(APIKEY);
-const rpc = initRpc(APIKEY);
+const rpc = shapeshift.getRpc();

 function mockget (requests) {
  let scope = nock(rpc.ENDPOINT);
@ -62,7 +55,7 @@ function mockpost (requests) {
  return scope;
 }

-export {
+module.exports = {
  APIKEY,
  mockget,
  mockpost,
--- a/js/src/3rdparty/shapeshift/rpc.spec.js
+++ b/js/src/3rdparty/shapeshift/rpc.spec.js
@ -14,7 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-import { APIKEY, mockget, mockpost, rpc } from './helpers.spec.js';
+const helpers = require('./helpers.spec.js');
+
+const APIKEY = helpers.APIKEY;
+const mockget = helpers.mockget;
+const mockpost = helpers.mockpost;
+const rpc = helpers.rpc;

 describe('shapeshift/rpc', () => {
  describe('GET', () => {
--- a/js/src/3rdparty/shapeshift/shapeshift.js
+++ b/js/src/3rdparty/shapeshift/shapeshift.js
@ -26,6 +26,10 @@ export default function (rpc) {
    return rpc.get(`marketinfo/${pair}`);
  }

+  function getRpc () {
+    return rpc;
+  }
+
  function getStatus (depositAddress) {
    return rpc.get(`txStat/${depositAddress}`);
  }
@ -103,6 +107,7 @@ export default function (rpc) {
  return {
    getCoins,
    getMarketInfo,
+    getRpc,
    getStatus,
    shift,
    subscribe,
--- a/js/src/3rdparty/shapeshift/shapeshift.spec.js
+++ b/js/src/3rdparty/shapeshift/shapeshift.spec.js
@ -14,7 +14,11 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-import { mockget, mockpost, shapeshift } from './helpers.spec.js';
+const helpers = require('./helpers.spec.js');
+
+const mockget = helpers.mockget;
+const mockpost = helpers.mockpost;
+const shapeshift = helpers.shapeshift;

 describe('shapeshift/calls', () => {
  describe('getCoins', () => {
--- a/js/src/contracts/contracts.js
+++ b/js/src/contracts/contracts.js
@ -62,6 +62,10 @@ export default class Contracts {
  }

  static create (api) {
+    if (instance) {
+      return instance;
+    }
+
    return new Contracts(api);
  }

--- a/js/src/library.etherscan.js
+++ b/js/src/library.etherscan.js
@ -0,0 +1,34 @@
+// 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 'babel-polyfill/dist/polyfill.js';
+import es6Promise from 'es6-promise';
+es6Promise.polyfill();
+
+const isNode = typeof global !== 'undefined' && typeof global !== 'undefined';
+const isBrowser = typeof self !== 'undefined' && typeof self.window !== 'undefined';
+
+if (isBrowser) {
+  require('whatwg-fetch');
+}
+
+if (isNode) {
+  global.fetch = require('node-fetch');
+}
+
+import Etherscan from './3rdparty/etherscan';
+
+module.exports = Etherscan;
--- a/js/src/library.parity.js
+++ b/js/src/library.parity.js
--- a/js/src/library.shapeshift.js
+++ b/js/src/library.shapeshift.js
@ -0,0 +1,34 @@
+// 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 'babel-polyfill/dist/polyfill.js';
+import es6Promise from 'es6-promise';
+es6Promise.polyfill();
+
+const isNode = typeof global !== 'undefined' && typeof global !== 'undefined';
+const isBrowser = typeof self !== 'undefined' && typeof self.window !== 'undefined';
+
+if (isBrowser) {
+  require('whatwg-fetch');
+}
+
+if (isNode) {
+  global.fetch = require('node-fetch');
+}
+
+import ShapeShift from './3rdparty/shapeshift';
+
+module.exports = ShapeShift;
--- a/js/src/main.js
+++ b/js/src/main.js
@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

 import React, { Component, PropTypes } from 'react';
-import { Redirect, Router, Route } from 'react-router';
+import { Redirect, Router, Route, IndexRoute } from 'react-router';

 import { Accounts, Account, Addresses, Address, Application, Contract, Contracts, WriteContract, Wallet, Dapp, Dapps, Settings, SettingsBackground, SettingsParity, SettingsProxy, SettingsViews, Signer, Status } from '~/views';

@ -26,6 +26,23 @@ export default class MainApplication extends Component {
    routerHistory: PropTypes.any.isRequired
  };

+  handleDeprecatedRoute = (nextState, replace) => {
+    const { address } = nextState.params;
+    const redirectMap = {
+      account: 'accounts',
+      address: 'addresses',
+      contract: 'contracts'
+    };
+
+    const oldRoute = nextState.routes[0].path;
+    const newRoute = Object.keys(redirectMap).reduce((newRoute, key) => {
+      return newRoute.replace(new RegExp(`^/${key}`), '/' + redirectMap[key]);
+    }, oldRoute);
+
+    console.warn(`Route "${oldRoute}" is deprecated. Please use "${newRoute}"`);
+    replace(newRoute.replace(':address', address));
+  }
+
  render () {
    const { routerHistory } = this.props;

@ -34,26 +51,46 @@ export default class MainApplication extends Component {
        <Redirect from='/' to='/accounts' />
        <Redirect from='/auth' to='/accounts' query={ {} } />
        <Redirect from='/settings' to='/settings/views' />
+
+        { /** Backward Compatible links */ }
+        <Route path='/account/:address' onEnter={ this.handleDeprecatedRoute } />
+        <Route path='/address/:address' onEnter={ this.handleDeprecatedRoute } />
+        <Route path='/contract/:address' onEnter={ this.handleDeprecatedRoute } />
+
        <Route path='/' component={ Application }>
-          <Route path='accounts' component={ Accounts } />
-          <Route path='account/:address' component={ Account } />
-          <Route path='wallet/:address' component={ Wallet } />
-          <Route path='addresses' component={ Addresses } />
-          <Route path='address/:address' component={ Address } />
+          <Route path='accounts'>
+            <IndexRoute component={ Accounts } />
+            <Route path=':address' component={ Account } />
+            <Route path='/wallet/:address' component={ Wallet } />
+          </Route>
+
+          <Route path='addresses'>
+            <IndexRoute component={ Addresses } />
+            <Route path=':address' component={ Address } />
+          </Route>
+
          <Route path='apps' component={ Dapps } />
          <Route path='app/:id' component={ Dapp } />
-          <Route path='contracts' component={ Contracts } />
-          <Route path='contracts/write' component={ WriteContract } />
-          <Route path='contract/:address' component={ Contract } />
+
+          <Route path='contracts'>
+            <IndexRoute component={ Contracts } />
+            <Route path='develop' component={ WriteContract } />
+            <Route path=':address' component={ Contract } />
+          </Route>
+
          <Route path='settings' component={ Settings }>
            <Route path='background' component={ SettingsBackground } />
            <Route path='proxy' component={ SettingsProxy } />
            <Route path='views' component={ SettingsViews } />
            <Route path='parity' component={ SettingsParity } />
          </Route>
+
          <Route path='signer' component={ Signer } />
-          <Route path='status' component={ Status } />
-          <Route path='status/:subpage' component={ Status } />
+
+          <Route path='status'>
+            <IndexRoute component={ Status } />
+            <Route path=':subpage' component={ Status } />
+          </Route>
        </Route>
      </Router>
    );
--- a/js/src/modals/AddAddress/addAddress.js
+++ b/js/src/modals/AddAddress/addAddress.js
@ -28,6 +28,7 @@ export default class AddAddress extends Component {

  static propTypes = {
    contacts: PropTypes.object.isRequired,
+    address: PropTypes.string,
    onClose: PropTypes.func
  };

@ -39,6 +40,12 @@ export default class AddAddress extends Component {
    description: ''
  };

+  componentWillMount () {
+    if (this.props.address) {
+      this.onEditAddress(null, this.props.address);
+    }
+  }
+
  render () {
    return (
      <Modal
@ -77,6 +84,8 @@ export default class AddAddress extends Component {
          hint='the network address for the entry'
          error={ addressError }
          value={ address }
+          disabled={ !!this.props.address }
+          allowCopy={ false }
          onChange={ this.onEditAddress } />
        <Input
          label='address name'
--- a/js/src/modals/CreateWallet/WalletInfo/walletInfo.js
+++ b/js/src/modals/CreateWallet/WalletInfo/walletInfo.js
@ -30,10 +30,12 @@ export default class WalletInfo extends Component {
    owners: PropTypes.array.isRequired,
    required: PropTypes.oneOfType([
      PropTypes.string,
+      PropTypes.object,
      PropTypes.number
    ]).isRequired,
    daylimit: PropTypes.oneOfType([
      PropTypes.string,
+      PropTypes.object,
      PropTypes.number
    ]).isRequired,

--- a/js/src/modals/DeployContract/DetailsStep/detailsStep.js
+++ b/js/src/modals/DeployContract/DetailsStep/detailsStep.js
@ -28,26 +28,25 @@ export default class DetailsStep extends Component {

  static propTypes = {
    accounts: PropTypes.object.isRequired,
-
-    onFromAddressChange: PropTypes.func.isRequired,
-    onNameChange: PropTypes.func.isRequired,
-    onDescriptionChange: PropTypes.func.isRequired,
    onAbiChange: PropTypes.func.isRequired,
    onCodeChange: PropTypes.func.isRequired,
-    onParamsChange: PropTypes.func.isRequired,
+    onDescriptionChange: PropTypes.func.isRequired,
+    onFromAddressChange: PropTypes.func.isRequired,
    onInputsChange: PropTypes.func.isRequired,
+    onNameChange: PropTypes.func.isRequired,
+    onParamsChange: PropTypes.func.isRequired,

+    abi: PropTypes.string,
+    abiError: PropTypes.string,
+    balances: PropTypes.object,
+    code: PropTypes.string,
+    codeError: PropTypes.string,
+    description: PropTypes.string,
+    descriptionError: PropTypes.string,
    fromAddress: PropTypes.string,
    fromAddressError: PropTypes.string,
    name: PropTypes.string,
    nameError: PropTypes.string,
-    description: PropTypes.string,
-    descriptionError: PropTypes.string,
-    abi: PropTypes.string,
-    abiError: PropTypes.string,
-    code: PropTypes.string,
-    codeError: PropTypes.string,
-
    readOnly: PropTypes.bool
  };

@ -77,6 +76,7 @@ export default class DetailsStep extends Component {
  render () {
    const {
      accounts,
+      balances,
      readOnly,

      fromAddress, fromAddressError,
@ -94,24 +94,28 @@ export default class DetailsStep extends Component {
        <AddressSelect
          label='from account (contract owner)'
          hint='the owner account for this contract'
-          value={ fromAddress }
-          error={ fromAddressError }
          accounts={ accounts }
-          onChange={ this.onFromAddressChange } />
+          balances={ balances }
+          error={ fromAddressError }
+          onChange={ this.onFromAddressChange }
+          value={ fromAddress }
+        />

        <Input
          label='contract name'
          hint='a name for the deployed contract'
          error={ nameError }
+          onChange={ this.onNameChange }
          value={ name || '' }
-          onChange={ this.onNameChange } />
+        />

        <Input
          label='contract description (optional)'
          hint='a description for the contract'
          error={ descriptionError }
+          onChange={ this.onDescriptionChange }
          value={ description }
-          onChange={ this.onDescriptionChange } />
+        />

        { this.renderContractSelect() }

@ -119,17 +123,19 @@ export default class DetailsStep extends Component {
          label='abi / solc combined-output'
          hint='the abi of the contract to deploy or solc combined-output'
          error={ abiError }
-          value={ solcOutput }
          onChange={ this.onSolcChange }
          onSubmit={ this.onSolcSubmit }
-          readOnly={ readOnly } />
+          readOnly={ readOnly }
+          value={ solcOutput }
+        />
        <Input
          label='code'
          hint='the compiled code of the contract to deploy'
          error={ codeError }
-          value={ code }
          onSubmit={ this.onCodeChange }
-          readOnly={ readOnly || solc } />
+          readOnly={ readOnly || solc }
+          value={ code }
+        />

      </Form>
    );
--- a/js/src/modals/DeployContract/deployContract.js
+++ b/js/src/modals/DeployContract/deployContract.js
@ -15,8 +15,10 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

 import React, { Component, PropTypes } from 'react';
+import { connect } from 'react-redux';
 import ActionDoneAll from 'material-ui/svg-icons/action/done-all';
 import ContentClear from 'material-ui/svg-icons/content/clear';
+import { pick } from 'lodash';

 import { BusyStep, CompletedStep, CopyToClipboard, Button, IdentityIcon, Modal, TxHash } from '~/ui';
 import { ERRORS, validateAbi, validateCode, validateName } from '~/util/validation';
@ -36,7 +38,7 @@ const STEPS = {
  COMPLETED: { title: 'completed' }
 };

-export default class DeployContract extends Component {
+class DeployContract extends Component {
  static contextTypes = {
    api: PropTypes.object.isRequired,
    store: PropTypes.object.isRequired
@ -45,6 +47,7 @@ export default class DeployContract extends Component {
  static propTypes = {
    accounts: PropTypes.object.isRequired,
    onClose: PropTypes.func.isRequired,
+    balances: PropTypes.object,
    abi: PropTypes.string,
    code: PropTypes.string,
    readOnly: PropTypes.bool,
@ -192,7 +195,7 @@ export default class DeployContract extends Component {
  }

  renderStep () {
-    const { accounts, readOnly } = this.props;
+    const { accounts, readOnly, balances } = this.props;
    const { address, deployError, step, deployState, txhash, rejected } = this.state;

    if (deployError) {
@ -216,6 +219,7 @@ export default class DeployContract extends Component {
          <DetailsStep
            { ...this.state }
            accounts={ accounts }
+            balances={ balances }
            readOnly={ readOnly }
            onFromAddressChange={ this.onFromAddressChange }
            onDescriptionChange={ this.onDescriptionChange }
@ -394,3 +398,17 @@ export default class DeployContract extends Component {
    this.props.onClose();
  }
 }
+
+function mapStateToProps (initState, initProps) {
+  const fromAddresses = Object.keys(initProps.accounts);
+
+  return (state) => {
+    const balances = pick(state.balances.balances, fromAddresses);
+    return { balances };
+  };
+}
+
+export default connect(
+  mapStateToProps
+)(DeployContract);
+
--- a/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js
+++ b/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js
@ -32,25 +32,27 @@ export default class DetailsStep extends Component {
  static propTypes = {
    accounts: PropTypes.object.isRequired,
    contract: PropTypes.object.isRequired,
-    amount: PropTypes.string,
-    amountError: PropTypes.string,
    onAmountChange: PropTypes.func.isRequired,
-    fromAddress: PropTypes.string,
-    fromAddressError: PropTypes.string,
-    gasEdit: PropTypes.bool,
    onFromAddressChange: PropTypes.func.isRequired,
-    func: PropTypes.object,
-    funcError: PropTypes.string,
-    onFuncChange: PropTypes.func,
-    onGasEditClick: PropTypes.func,
+    onValueChange: PropTypes.func.isRequired,
    values: PropTypes.array.isRequired,
    valuesError: PropTypes.array.isRequired,
-    warning: PropTypes.string,
-    onValueChange: PropTypes.func.isRequired
+
+    amount: PropTypes.string,
+    amountError: PropTypes.string,
+    balances: PropTypes.object,
+    fromAddress: PropTypes.string,
+    fromAddressError: PropTypes.string,
+    func: PropTypes.object,
+    funcError: PropTypes.string,
+    gasEdit: PropTypes.bool,
+    onFuncChange: PropTypes.func,
+    onGasEditClick: PropTypes.func,
+    warning: PropTypes.string
  }

  render () {
-    const { accounts, amount, amountError, fromAddress, fromAddressError, gasEdit, onGasEditClick, onFromAddressChange, onAmountChange } = this.props;
+    const { accounts, amount, amountError, balances, fromAddress, fromAddressError, gasEdit, onGasEditClick, onFromAddressChange, onAmountChange } = this.props;

    return (
      <Form>
@ -61,6 +63,7 @@ export default class DetailsStep extends Component {
          value={ fromAddress }
          error={ fromAddressError }
          accounts={ accounts }
+          balances={ balances }
          onChange={ onFromAddressChange } />
        { this.renderFunctionSelect() }
        { this.renderParameters() }
--- a/js/src/modals/ExecuteContract/executeContract.js
+++ b/js/src/modals/ExecuteContract/executeContract.js
@ -18,6 +18,8 @@ import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
 import { bindActionCreators } from 'redux';
 import { observer } from 'mobx-react';
+import { pick } from 'lodash';
+
 import ActionDoneAll from 'material-ui/svg-icons/action/done-all';
 import ContentClear from 'material-ui/svg-icons/content/clear';
 import NavigationArrowBack from 'material-ui/svg-icons/navigation/arrow-back';
@ -57,6 +59,7 @@ class ExecuteContract extends Component {
    isTest: PropTypes.bool,
    fromAddress: PropTypes.string,
    accounts: PropTypes.object,
+    balances: PropTypes.object,
    contract: PropTypes.object,
    gasLimit: PropTypes.object.isRequired,
    onClose: PropTypes.func.isRequired,
@ -362,10 +365,15 @@ class ExecuteContract extends Component {
  }
 }

-function mapStateToProps (state) {
-  const { gasLimit } = state.nodeStatus;
+function mapStateToProps (initState, initProps) {
+  const fromAddresses = Object.keys(initProps.accounts);

-  return { gasLimit };
+  return (state) => {
+    const balances = pick(state.balances.balances, fromAddresses);
+    const { gasLimit } = state.nodeStatus;
+
+    return { gasLimit, balances };
+  };
 }

 function mapDispatchToProps (dispatch) {
--- a/js/src/modals/Transfer/Details/details.js
+++ b/js/src/modals/Transfer/Details/details.js
@ -134,6 +134,7 @@ export default class Details extends Component {
    images: PropTypes.object.isRequired,
    sender: PropTypes.string,
    senderError: PropTypes.string,
+    sendersBalances: PropTypes.object,
    recipient: PropTypes.string,
    recipientError: PropTypes.string,
    tag: PropTypes.string,
@ -203,7 +204,7 @@ export default class Details extends Component {
  }

  renderFromAddress () {
-    const { sender, senderError, senders } = this.props;
+    const { sender, senderError, senders, sendersBalances } = this.props;

    if (!senders) {
      return null;
@ -218,6 +219,7 @@ export default class Details extends Component {
          hint='the sender address'
          value={ sender }
          onChange={ this.onEditSender }
+          balances={ sendersBalances }
        />
      </div>
    );
--- a/js/src/modals/Transfer/store.js
+++ b/js/src/modals/Transfer/store.js
@ -54,6 +54,7 @@ export default class TransferStore {

  @observable sender = '';
  @observable senderError = null;
+  @observable sendersBalances = {};

  @observable total = '0.0';
  @observable totalError = null;
@ -66,8 +67,6 @@ export default class TransferStore {
  onClose = null;

  senders = null;
-  sendersBalances = null;
-
  isWallet = false;
  wallet = null;

--- a/js/src/modals/Transfer/transfer.js
+++ b/js/src/modals/Transfer/transfer.js
@ -155,8 +155,8 @@ class Transfer extends Component {

  renderDetailsPage () {
    const { account, balance, images, senders } = this.props;
-    const { valueAll, extras, recipient, recipientError, sender, senderError } = this.store;
-    const { tag, total, totalError, value, valueError } = this.store;
+    const { recipient, recipientError, sender, senderError, sendersBalances } = this.store;
+    const { valueAll, extras, tag, total, totalError, value, valueError } = this.store;

    return (
      <Details
@ -170,6 +170,7 @@ class Transfer extends Component {
        recipientError={ recipientError }
        sender={ sender }
        senderError={ senderError }
+        sendersBalances={ sendersBalances }
        tag={ tag }
        total={ total }
        totalError={ totalError }
--- a/js/src/ui/Form/AddressSelect/addressSelect.css
+++ b/js/src/ui/Form/AddressSelect/addressSelect.css
@ -15,7 +15,9 @@
 /* along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 */
 .account {
-  padding: 4px 0 0 0;
+  padding: 0.25em 0;
+  display: flex;
+  align-items: center;
 }

 .name {
@ -27,6 +29,11 @@
  padding: 0 0 0 1em;
 }

+.balance {
+  color: #aaa;
+  padding-left: 1em;
+}
+
 .image {
  display: inline-block;
  height: 32px;
--- a/js/src/ui/Form/AddressSelect/addressSelect.js
+++ b/js/src/ui/Form/AddressSelect/addressSelect.js
@ -21,6 +21,8 @@ import AutoComplete from '../AutoComplete';
 import IdentityIcon from '../../IdentityIcon';
 import IdentityName from '../../IdentityName';

+import { fromWei } from '~/api/util/wei';
+
 import styles from './addressSelect.css';

 export default class AddressSelect extends Component {
@ -40,27 +42,46 @@ export default class AddressSelect extends Component {
    value: PropTypes.string,
    tokens: PropTypes.object,
    onChange: PropTypes.func.isRequired,
-    allowInput: PropTypes.bool
+    allowInput: PropTypes.bool,
+    balances: PropTypes.object
  }

  state = {
+    autocompleteEntries: [],
    entries: {},
    addresses: [],
    value: ''
  }

  entriesFromProps (props = this.props) {
-    const { accounts, contacts, contracts, wallets } = props;
-    const entries = Object.assign({}, accounts || {}, wallets || {}, contacts || {}, contracts || {});
-    return entries;
+    const { accounts = {}, contacts = {}, contracts = {}, wallets = {} } = props;
+
+    const autocompleteEntries = [].concat(
+      Object.values(wallets),
+      'divider',
+      Object.values(accounts),
+      'divider',
+      Object.values(contacts),
+      'divider',
+      Object.values(contracts)
+    );
+
+    const entries = {
+      ...wallets,
+      ...accounts,
+      ...contacts,
+      ...contracts
+    };
+
+    return { autocompleteEntries, entries };
  }

  componentWillMount () {
    const { value } = this.props;
-    const entries = this.entriesFromProps();
+    const { entries, autocompleteEntries } = this.entriesFromProps();
    const addresses = Object.keys(entries).sort();

-    this.setState({ entries, addresses, value });
+    this.setState({ autocompleteEntries, entries, addresses, value });
  }

  componentWillReceiveProps (newProps) {
@ -71,7 +92,7 @@ export default class AddressSelect extends Component {

  render () {
    const { allowInput, disabled, error, hint, label } = this.props;
-    const { entries, value } = this.state;
+    const { autocompleteEntries, value } = this.state;

    const searchText = this.getSearchText();
    const icon = this.renderIdentityIcon(value);
@ -89,7 +110,7 @@ export default class AddressSelect extends Component {
          onUpdateInput={ allowInput && this.onUpdateInput }
          value={ searchText }
          filter={ this.handleFilter }
-          entries={ entries }
+          entries={ autocompleteEntries }
          entry={ this.getEntry() || {} }
          renderItem={ this.renderItem }
        />
@ -129,7 +150,34 @@ export default class AddressSelect extends Component {
    };
  }

+  renderBalance (address) {
+    const { balances = {} } = this.props;
+    const balance = balances[address];
+
+    if (!balance) {
+      return null;
+    }
+
+    const ethToken = balance.tokens.find((tok) => tok.token && tok.token.tag && tok.token.tag.toLowerCase() === 'eth');
+
+    if (!ethToken) {
+      return null;
+    }
+
+    const value = fromWei(ethToken.value);
+
+    return (
+      <div className={ styles.balance }>
+        { value.toFormat(3) }<small> { 'ETH' }</small>
+      </div>
+    );
+  }
+
  renderMenuItem (address) {
+    const balance = this.props.balances
+      ? this.renderBalance(address)
+      : null;
+
    const item = (
      <div className={ styles.account }>
        <IdentityIcon
@ -139,6 +187,7 @@ export default class AddressSelect extends Component {
        <IdentityName
          className={ styles.name }
          address={ address } />
+        { balance }
      </div>
    );

@ -155,11 +204,10 @@ export default class AddressSelect extends Component {

  getSearchText () {
    const entry = this.getEntry();
-    const { value } = this.state;

    return entry && entry.name
      ? entry.name.toUpperCase()
-      : value;
+      : this.state.value;
  }

  getEntry () {
--- a/js/src/ui/Form/AutoComplete/autocomplete.js
+++ b/js/src/ui/Form/AutoComplete/autocomplete.js
@ -16,11 +16,24 @@

 import React, { Component, PropTypes } from 'react';
 import keycode from 'keycode';
-import { MenuItem, AutoComplete as MUIAutoComplete } from 'material-ui';
+import { MenuItem, AutoComplete as MUIAutoComplete, Divider as MUIDivider } from 'material-ui';
 import { PopoverAnimationVertical } from 'material-ui/Popover';

 import { isEqual } from 'lodash';

+// 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' } }>
+        <MUIDivider style={ { height: 2 } } />
+      </div>
+    );
+  }
+}
+
 export default class AutoComplete extends Component {
  static propTypes = {
    onChange: PropTypes.func.isRequired,
@ -38,15 +51,17 @@ export default class AutoComplete extends Component {
      PropTypes.array,
      PropTypes.object
    ])
-  }
+  };

  state = {
    lastChangedValue: undefined,
    entry: null,
    open: false,
-    fakeBlur: false,
-    dataSource: []
-  }
+    dataSource: [],
+    dividerBreaks: []
+  };
+
+  dividersVisibility = {};

  componentWillMount () {
    const dataSource = this.getDataSource();
@ -64,7 +79,7 @@ export default class AutoComplete extends Component {
  }

  render () {
-    const { disabled, error, hint, label, value, className, filter, onUpdateInput } = this.props;
+    const { disabled, error, hint, label, value, className, onUpdateInput } = this.props;
    const { open, dataSource } = this.state;

    return (
@ -78,9 +93,9 @@ export default class AutoComplete extends Component {
        onUpdateInput={ onUpdateInput }
        searchText={ value }
        onFocus={ this.onFocus }
-        onBlur={ this.onBlur }
+        onClose={ this.onClose }
        animation={ PopoverAnimationVertical }
-        filter={ filter }
+        filter={ this.handleFilter }
        popoverProps={ { open } }
        openOnFocus
        menuCloseDelay={ 0 }
@ -100,18 +115,76 @@ export default class AutoComplete extends Component {
      ? entries
      : Object.values(entries);

-    if (renderItem && typeof renderItem === 'function') {
-      return entriesArray.map(entry => renderItem(entry));
+    let currentDivider = 0;
+    let firstSet = false;
+
+    const dataSource = entriesArray.map((entry, index) => {
+      // Render divider
+      if (typeof entry === 'string' && entry.toLowerCase() === 'divider') {
+        // Don't add divider if nothing before
+        if (!firstSet) {
+          return undefined;
+        }
+
+        const item = {
+          text: '',
+          divider: currentDivider,
+          isDivider: true,
+          value: (
+            <Divider />
+          )
+        };
+
+        currentDivider++;
+        return item;
+      }
+
+      let item;
+
+      if (renderItem && typeof renderItem === 'function') {
+        item = renderItem(entry);
+      } else {
+        item = {
+          text: entry,
+          value: (
+            <MenuItem
+              primaryText={ entry }
+            />
+          )
+        };
+      }
+
+      if (!firstSet) {
+        item.first = true;
+        firstSet = true;
+      }
+
+      item.divider = currentDivider;
+
+      return item;
+    }).filter((item) => item !== undefined);
+
+    return dataSource;
+  }
+
+  handleFilter = (searchText, name, item) => {
+    if (item.isDivider) {
+      return this.dividersVisibility[item.divider];
    }

-    return entriesArray.map(entry => ({
-      text: entry,
-      value: (
-        <MenuItem
-          primaryText={ entry }
-        />
-      )
-    }));
+    if (item.first) {
+      this.dividersVisibility = {};
+    }
+
+    const { filter } = this.props;
+    const show = filter(searchText, name, item);
+
+    // Show the related divider
+    if (show) {
+      this.dividersVisibility[item.divider] = true;
+    }
+
+    return show;
  }

  onKeyDown = (event) => {
@ -121,7 +194,6 @@ export default class AutoComplete extends Component {
      case 'down':
        const { menu } = muiAutocomplete.refs;
        menu && menu.handleKeyDown(event);
-        this.setState({ fakeBlur: true });
        break;

      case 'enter':
@ -155,22 +227,12 @@ export default class AutoComplete extends Component {
    this.setState({ entry, open: false });
  }

-  onBlur = (event) => {
+  onClose = (event) => {
    const { onUpdateInput } = this.props;

-    // TODO: Handle blur gracefully where we use onUpdateInput (currently replaces
-    // input where text is allowed with the last selected value from the dropdown)
    if (!onUpdateInput) {
-      window.setTimeout(() => {
-        const { entry, fakeBlur } = this.state;
-
-        if (fakeBlur) {
-          this.setState({ fakeBlur: false });
-          return;
-        }
-
-        this.handleOnChange(entry);
-      }, 200);
+      const { entry } = this.state;
+      this.handleOnChange(entry);
    }
  }

--- a/js/src/ui/Page/page.css
+++ b/js/src/ui/Page/page.css
@ -16,7 +16,7 @@
 */

 .layout {
-  padding: 0.25em 0.25em 1em 0.25em;
+  padding: 0.25em;

  &>div {
    margin-bottom: 0.75em;
--- a/js/src/views/Account/Header/header.css
+++ b/js/src/views/Account/Header/header.css
@ -31,6 +31,10 @@
 .infoline,
 .uuidline {
  line-height: 1.618em;
+
+  &.bigaddress {
+    font-size: 1.25em;
+  }
 }

 .infoline,
--- a/js/src/views/Account/Header/header.js
+++ b/js/src/views/Account/Header/header.js
@ -32,18 +32,20 @@ export default class Header extends Component {
    balance: PropTypes.object,
    className: PropTypes.string,
    children: PropTypes.node,
-    isContract: PropTypes.bool
+    isContract: PropTypes.bool,
+    hideName: PropTypes.bool
  };

  static defaultProps = {
    className: '',
    children: null,
-    isContract: false
+    isContract: false,
+    hideName: false
  };

  render () {
    const { api } = this.context;
-    const { account, balance, className, children } = this.props;
+    const { account, balance, className, children, hideName } = this.props;
    const { address, meta, uuid } = account;

    if (!account) {
@ -60,17 +62,20 @@ export default class Header extends Component {
          <IdentityIcon
            address={ address } />
          <div className={ styles.floatleft }>
-            <ContainerTitle title={ <IdentityName address={ address } unknown /> } />
-            <div className={ styles.addressline }>
+            { this.renderName(address) }
+
+            <div className={ [ hideName ? styles.bigaddress : '', styles.addressline ].join(' ') }>
              <CopyToClipboard data={ address } />
              <div className={ styles.address }>{ address }</div>
            </div>
+
            { uuidText }
            <div className={ styles.infoline }>
              { meta.description }
            </div>
            { this.renderTxCount() }
          </div>
+
          <div className={ styles.tags }>
            <Tags tags={ meta.tags } />
          </div>
@ -89,6 +94,18 @@ export default class Header extends Component {
    );
  }

+  renderName (address) {
+    const { hideName } = this.props;
+
+    if (hideName) {
+      return null;
+    }
+
+    return (
+      <ContainerTitle title={ <IdentityName address={ address } unknown /> } />
+    );
+  }
+
  renderTxCount () {
    const { balance, isContract } = this.props;

--- a/js/src/views/Account/account.js
+++ b/js/src/views/Account/account.js
@ -26,7 +26,7 @@ import VerifyIcon from 'material-ui/svg-icons/action/verified-user';
 import { EditMeta, DeleteAccount, Shapeshift, SMSVerification, Transfer, PasswordManager } from '~/modals';
 import { Actionbar, Button, Page } from '~/ui';

-import shapeshiftBtn from '../../../assets/images/shapeshift-btn.png';
+import shapeshiftBtn from '~/../assets/images/shapeshift-btn.png';

 import Header from './Header';
 import Transactions from './Transactions';
--- a/js/src/views/Accounts/Summary/summary.js
+++ b/js/src/views/Accounts/Summary/summary.js
@ -153,7 +153,7 @@ export default class Summary extends Component {
    const { link, noLink, account, name } = this.props;

    const { address } = account;
-    const viewLink = `/${link || 'account'}/${address}`;
+    const viewLink = `/${link || 'accounts'}/${address}`;

    const content = (
      <IdentityName address={ address } name={ name } unknown />
--- a/js/src/views/Address/address.js
+++ b/js/src/views/Address/address.js
@ -19,8 +19,9 @@ import { connect } from 'react-redux';
 import { bindActionCreators } from 'redux';
 import ActionDelete from 'material-ui/svg-icons/action/delete';
 import ContentCreate from 'material-ui/svg-icons/content/create';
+import ContentAdd from 'material-ui/svg-icons/content/add';

-import { EditMeta } from '~/modals';
+import { EditMeta, AddAddress } from '~/modals';
 import { Actionbar, Button, Page } from '~/ui';

 import Header from '../Account/Header';
@ -32,7 +33,7 @@ class Address extends Component {
  static contextTypes = {
    api: PropTypes.object.isRequired,
    router: PropTypes.object.isRequired
-  }
+  };

  static propTypes = {
    setVisibleAccounts: PropTypes.func.isRequired,
@ -40,12 +41,13 @@ class Address extends Component {
    contacts: PropTypes.object,
    balances: PropTypes.object,
    params: PropTypes.object
-  }
+  };

  state = {
    showDeleteDialog: false,
-    showEditDialog: false
-  }
+    showEditDialog: false,
+    showAdd: false
+  };

  componentDidMount () {
    this.setVisibleAccounts();
@ -73,32 +75,69 @@ class Address extends Component {
  render () {
    const { contacts, balances } = this.props;
    const { address } = this.props.params;
-    const { showDeleteDialog } = this.state;
+
+    if (Object.keys(contacts).length === 0) {
+      return null;
+    }

    const contact = (contacts || {})[address];
    const balance = (balances || {})[address];

-    if (!contact) {
+    return (
+      <div>
+        { this.renderAddAddress(contact, address) }
+        { this.renderEditDialog(contact) }
+        { this.renderActionbar(contact) }
+        { this.renderDelete(contact) }
+        <Page>
+          <Header
+            account={ contact || { address, meta: {} } }
+            balance={ balance }
+            hideName={ !contact }
+          />
+          <Transactions
+            address={ address }
+          />
+        </Page>
+      </div>
+    );
+  }
+
+  renderAddAddress (contact, address) {
+    if (contact) {
+      return null;
+    }
+
+    const { contacts } = this.props;
+    const { showAdd } = this.state;
+
+    if (!showAdd) {
      return null;
    }

    return (
-      <div>
-        { this.renderEditDialog(contact) }
-        { this.renderActionbar(contact) }
-        <Delete
-          account={ contact }
-          visible={ showDeleteDialog }
-          route='/addresses'
-          onClose={ this.closeDeleteDialog } />
-        <Page>
-          <Header
-            account={ contact }
-            balance={ balance } />
-          <Transactions
-            address={ address } />
-        </Page>
-      </div>
+      <AddAddress
+        contacts={ contacts }
+        onClose={ this.onCloseAdd }
+        address={ address }
+      />
+    );
+  }
+
+  renderDelete (contact) {
+    if (!contact) {
+      return null;
+    }
+
+    const { showDeleteDialog } = this.state;
+
+    return (
+      <Delete
+        account={ contact }
+        visible={ showDeleteDialog }
+        route='/addresses'
+        onClose={ this.closeDeleteDialog }
+      />
    );
  }

@ -116,17 +155,27 @@ class Address extends Component {
        onClick={ this.showDeleteDialog } />
    ];

+    const addToBook = (
+      <Button
+        key='newAddress'
+        icon={ <ContentAdd /> }
+        label='save address'
+        onClick={ this.onOpenAdd }
+      />
+    );
+
    return (
      <Actionbar
        title='Address Information'
-        buttons={ !contact ? [] : buttons } />
+        buttons={ !contact ? [ addToBook ] : buttons }
+      />
    );
  }

  renderEditDialog (contact) {
    const { showEditDialog } = this.state;

-    if (!showEditDialog) {
+    if (!contact || !showEditDialog) {
      return null;
    }

@ -151,6 +200,16 @@ class Address extends Component {
  showDeleteDialog = () => {
    this.setState({ showDeleteDialog: true });
  }
+
+  onOpenAdd = () => {
+    this.setState({
+      showAdd: true
+    });
+  }
+
+  onCloseAdd = () => {
+    this.setState({ showAdd: false });
+  }
 }

 function mapStateToProps (state) {
--- a/js/src/views/Addresses/addresses.js
+++ b/js/src/views/Addresses/addresses.js
@ -23,7 +23,7 @@ import { uniq, isEqual } from 'lodash';
 import List from '../Accounts/List';
 import Summary from '../Accounts/Summary';
 import { AddAddress } from '~/modals';
-import { Actionbar, ActionbarExport, ActionbarImport, ActionbarSearch, ActionbarSort, Button, Page } from '~/ui';
+import { Actionbar, ActionbarExport, ActionbarImport, ActionbarSearch, ActionbarSort, Button, Page, Loading } from '~/ui';
 import { setVisibleAccounts } from '~/redux/providers/personalActions';

 import styles from './addresses.css';
@ -72,27 +72,40 @@ class Addresses extends Component {
  }

  render () {
-    const { balances, contacts, hasContacts } = this.props;
-    const { searchValues, sortOrder } = this.state;
-
    return (
      <div>
        { this.renderActionbar() }
        { this.renderAddAddress() }
        <Page>
-          <List
-            link='address'
-            search={ searchValues }
-            accounts={ contacts }
-            balances={ balances }
-            empty={ !hasContacts }
-            order={ sortOrder }
-            handleAddSearchToken={ this.onAddSearchToken } />
+          { this.renderAccountsList() }
        </Page>
      </div>
    );
  }

+  renderAccountsList () {
+    const { balances, contacts, hasContacts } = this.props;
+    const { searchValues, sortOrder } = this.state;
+
+    if (hasContacts && Object.keys(balances).length === 0) {
+      return (
+        <Loading />
+      );
+    }
+
+    return (
+      <List
+        link='addresses'
+        search={ searchValues }
+        accounts={ contacts }
+        balances={ balances }
+        empty={ !hasContacts }
+        order={ sortOrder }
+        handleAddSearchToken={ this.onAddSearchToken }
+      />
+    );
+  }
+
  renderSortButton () {
    const onChange = (sortOrder) => {
      this.setState({ sortOrder });
--- a/js/src/views/Application/TabBar/tabBar.css
+++ b/js/src/views/Application/TabBar/tabBar.css
@ -30,24 +30,34 @@
  }
 }

-.tabs button,
+.tabLink {
+  display: flex;
+
+  > * {
+    flex: 1;
+  }
+
+  &:hover {
+    background: rgba(0, 0, 0, 0.4) !important;
+  }
+
+  &.tabactive, &.tabactive:hover {
+    background: rgba(0, 0, 0, 0.25) !important;
+    border-radius: 4px 4px 0 0;
+
+    * {
+      color: white !important;
+    }
+  }
+}
+
+.tabLink,
 .settings,
 .logo,
 .last {
  background: rgba(0, 0, 0, 0.5) !important; /* rgba(0, 0, 0, 0.25) !important; */
 }

-.tabs button:hover {
-  background: rgba(0, 0, 0, 0.4) !important;
-}
-
-button.tabactive,
-button.tabactive:hover {
-  color: white !important;
-  background: rgba(0, 0, 0, 0.25) !important;
-  border-radius: 4px 4px 0 0;
-}
-
 .tabbarTooltip {
  left: 3.3em;
  top: 0.5em;
--- a/js/src/views/Application/TabBar/tabBar.js
+++ b/js/src/views/Application/TabBar/tabBar.js
@ -16,7 +16,7 @@

 import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
-import { bindActionCreators } from 'redux';
+import { Link } from 'react-router';
 import { Toolbar, ToolbarGroup } from 'material-ui/Toolbar';
 import { Tab as MUITab } from 'material-ui/Tabs';
 import { isEqual } from 'lodash';
@ -26,41 +26,26 @@ import { Badge, Tooltip } from '~/ui';
 import styles from './tabBar.css';
 import imagesEthcoreBlock from '../../../../assets/images/parity-logo-white-no-text.svg';

-const TABMAP = {
-  accounts: 'account',
-  wallet: 'account',
-  addresses: 'address',
-  apps: 'app',
-  contracts: 'contract',
-  deploy: 'contract'
-};
-
 class Tab extends Component {
  static propTypes = {
-    active: PropTypes.bool,
    view: PropTypes.object,
    children: PropTypes.node,
-    pendings: PropTypes.number,
-    onChange: PropTypes.func
+    pendings: PropTypes.number
  };

  shouldComponentUpdate (nextProps) {
-    return nextProps.active !== this.props.active ||
-      (nextProps.view.id === 'signer' && nextProps.pendings !== this.props.pendings);
+    return (nextProps.view.id === 'signer' && nextProps.pendings !== this.props.pendings);
  }

  render () {
-    const { active, view, children } = this.props;
+    const { view, children } = this.props;

    const label = this.getLabel(view);

    return (
      <MUITab
-        className={ active ? styles.tabactive : '' }
-        selected={ active }
        icon={ view.icon }
        label={ label }
-        onTouchTap={ this.handleClick }
      >
        { children }
      </MUITab>
@ -118,11 +103,6 @@ class Tab extends Component {

    return this.renderLabel(label, null);
  }
-
-  handleClick = () => {
-    const { onChange, view } = this.props;
-    onChange(view);
-  }
 }

 class TabBar extends Component {
@ -132,7 +112,6 @@ class TabBar extends Component {

  static propTypes = {
    views: PropTypes.array.isRequired,
-    hash: PropTypes.string.isRequired,
    pending: PropTypes.array,
    isTest: PropTypes.bool,
    netChain: PropTypes.string
@ -142,34 +121,11 @@ class TabBar extends Component {
    pending: []
  };

-  state = {
-    activeViewId: ''
-  };
-
-  setActiveView (props = this.props) {
-    const { hash, views } = props;
-    const view = views.find((view) => view.value === hash);
-
-    this.setState({ activeViewId: view.id });
-  }
-
-  componentWillMount () {
-    this.setActiveView();
-  }
-
-  componentWillReceiveProps (nextProps) {
-    if (nextProps.hash !== this.props.hash) {
-      this.setActiveView(nextProps);
-    }
-  }
-
  shouldComponentUpdate (nextProps, nextState) {
    const prevViews = this.props.views.map((v) => v.id).sort();
    const nextViews = nextProps.views.map((v) => v.id).sort();

-    return (nextProps.hash !== this.props.hash) ||
-      (nextProps.pending.length !== this.props.pending.length) ||
-      (nextState.activeViewId !== this.state.activeViewId) ||
+    return (nextProps.pending.length !== this.props.pending.length) ||
      (!isEqual(prevViews, nextViews));
  }

@ -206,7 +162,6 @@ class TabBar extends Component {

  renderTabs () {
    const { views, pending } = this.props;
-    const { activeViewId } = this.state;

    const items = views
      .map((view, index) => {
@ -216,60 +171,66 @@ class TabBar extends Component {
          )
          : null;

-        const active = activeViewId === view.id;
-
        return (
-          <Tab
-            active={ active }
-            view={ view }
-            onChange={ this.onChange }
+          <Link
            key={ view.id }
-            pendings={ pending.length }
+            to={ view.route }
+            activeClassName={ styles.tabactive }
+            className={ styles.tabLink }
          >
-            { body }
-          </Tab>
+            <Tab
+              view={ view }
+              pendings={ pending.length }
+            >
+              { body }
+            </Tab>
+          </Link>
        );
      });

    return (
-      <div
-        className={ styles.tabs }
-        onChange={ this.onChange }>
+      <div className={ styles.tabs }>
        { items }
      </div>
    );
  }
-
-  onChange = (view) => {
-    const { router } = this.context;
-
-    router.push(view.route);
-    this.setState({ activeViewId: view.id });
-  }
 }

-function mapStateToProps (state) {
-  const { views } = state.settings;
+function mapStateToProps (initState) {
+  const { views } = initState.settings;

-  const filteredViews = Object
+  let filteredViewIds = Object
    .keys(views)
-    .filter((id) => views[id].fixed || views[id].active)
+    .filter((id) => views[id].fixed || views[id].active);
+
+  let filteredViews = filteredViewIds
    .map((id) => ({
      ...views[id],
      id
    }));

-  const windowHash = (window.location.hash || '').split('?')[0].split('/')[1];
-  const hash = TABMAP[windowHash] || windowHash;
+  return (state) => {
+    const { views } = state.settings;

-  return { views: filteredViews, hash };
-}
+    const viewIds = Object
+      .keys(views)
+      .filter((id) => views[id].fixed || views[id].active);

-function mapDispatchToProps (dispatch) {
-  return bindActionCreators({}, dispatch);
+    if (isEqual(viewIds, filteredViewIds)) {
+      return { views: filteredViews };
+    }
+
+    filteredViewIds = viewIds;
+    filteredViews = viewIds
+      .map((id) => ({
+        ...views[id],
+        id
+      }));
+
+    return { views: filteredViews };
+  };
 }

 export default connect(
-  mapStateToProps,
-  mapDispatchToProps
+  mapStateToProps
 )(TabBar);
--- a/js/src/views/Application/application.css
+++ b/js/src/views/Application/application.css
@ -19,4 +19,5 @@
  display: flex;
  flex-direction: column;
  min-height: 100vh;
+  padding-bottom: 1em;
 }
--- a/js/src/views/Contracts/contracts.js
+++ b/js/src/views/Contracts/contracts.js
@ -85,7 +85,7 @@ class Contracts extends Component {
        { this.renderDeployContract() }
        <Page>
          <List
-            link='contract'
+            link='contracts'
            search={ searchValues }
            accounts={ contracts }
            balances={ balances }
@ -142,12 +142,12 @@ class Contracts extends Component {
        label='deploy contract'
        onClick={ this.onDeployContract } />,
      <Link
-        to='/contracts/write'
+        to='/contracts/develop'
        key='writeContract'
      >
        <Button
          icon={ <FileIcon /> }
-          label='write contract'
+          label='develop contract'
        />
      </Link>,

--- a/js/src/views/Dapps/dapps.js
+++ b/js/src/views/Dapps/dapps.js
@ -72,9 +72,17 @@ export default class Dapps extends Component {
          ] }
        />
        <Page>
-          { this.renderList(this.store.visibleLocal) }
-          { this.renderList(this.store.visibleBuiltin) }
-          { this.renderList(this.store.visibleNetwork, externalOverlay) }
+          <div>
+            { this.renderList(this.store.visibleLocal) }
+          </div>
+
+          <div>
+            { this.renderList(this.store.visibleBuiltin) }
+          </div>
+
+          <div>
+            { this.renderList(this.store.visibleNetwork, externalOverlay) }
+          </div>
        </Page>
      </div>
    );
--- a/js/test/npmLibrary.js
+++ b/js/test/npmLibrary.js
@ -15,8 +15,8 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

 try {
-  var Api = require('../.npmjs/library.js').Api;
-  var Abi = require('../.npmjs/library.js').Abi;
+  var Api = require('../.npmjs/parity/library.js').Api;
+  var Abi = require('../.npmjs/parity/library.js').Abi;

  if (typeof Api !== 'function') {
    throw new Error('No Api');
--- a/js/webpack/npm.js
+++ b/js/webpack/npm.js
@ -23,14 +23,27 @@ const Shared = require('./shared');
 const ENV = process.env.NODE_ENV || 'development';
 const isProd = ENV === 'production';

+const LIBRARY = process.env.LIBRARY;
+if (!LIBRARY) {
+  process.exit(-1);
+}
+const SRC = LIBRARY.toLowerCase();
+const OUTPUT_PATH = path.join(__dirname, '../.npmjs', SRC);
+
+const TEST_CONTEXT = SRC === 'parity'
+  ? '../npm/parity/test/'
+  : `../src/3rdparty/${SRC}/`;
+
+console.log(`Building ${LIBRARY} from library.${SRC}.js to .npmjs/${SRC}`);
+
 module.exports = {
  context: path.join(__dirname, '../src'),
  target: 'node',
-  entry: 'library.js',
+  entry: `library.${SRC}.js`,
  output: {
-    path: path.join(__dirname, '../.npmjs'),
+    path: OUTPUT_PATH,
    filename: 'library.js',
-    library: 'Parity',
+    library: LIBRARY,
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
@ -66,19 +79,52 @@ module.exports = {
  plugins: Shared.getPlugins().concat([
    new CopyWebpackPlugin([
      {
-        from: '../parity.package.json',
+        from: `../npm/${SRC}/package.json`,
        to: 'package.json',
        transform: function (content, path) {
          const json = JSON.parse(content.toString());
          json.version = packageJson.version;
+
+          // Add tests dependencies to Dev Deps
+          json.devDependencies.chai = packageJson.devDependencies.chai;
+          json.devDependencies.mocha = packageJson.devDependencies.mocha;
+          json.devDependencies.nock = packageJson.devDependencies.nock;
+
+          // Add test script
+          json.scripts.test = 'mocha \'test/*.spec.js\'';
+
          return new Buffer(JSON.stringify(json, null, '  '), 'utf-8');
        }
      },
      {
        from: '../LICENSE'
      },
+
+      // Copy the base test config
      {
-        from: '../parity.md',
+        from: '../npm/test',
+        to: 'test'
+      },
+
+      // Copy the actual tests
+      {
+        context: TEST_CONTEXT,
+        from: '**/*.spec.js',
+        to: 'test',
+        transform: function (content, path) {
+          let output = content.toString();
+
+          // Don't skip tests
+          output = output.replace(/describe\.skip/, 'describe');
+
+          // Require parent library
+          output = output.replace('require(\'./\')', 'require(\'../\')');
+
+          return new Buffer(output, 'utf-8');
+        }
+      },
+      {
+        from: `../npm/${SRC}/README.md`,
        to: 'README.md'
      }
    ], { copyUnmodified: true })
--- a/js/webpack/shared.js
+++ b/js/webpack/shared.js
@ -36,6 +36,29 @@ function getBabelrc () {
  // [ "es2015", { "modules": false } ]
  babelrc.presets[es2015Index] = [ 'es2015', { modules: false } ];
  babelrc['babelrc'] = false;
+
+  const BABEL_PRESET_ENV = process.env.BABEL_PRESET_ENV;
+  const npmStart = process.env.npm_lifecycle_event === 'start';
+  const npmStartApp = process.env.npm_lifecycle_event === 'start:app';
+
+  if (BABEL_PRESET_ENV && (npmStart || npmStartApp)) {
+    console.log('using babel-preset-env');
+
+    babelrc.presets = [
+      // 'es2017',
+      'stage-0', 'react',
+      [
+        'env',
+        {
+          targets: { browsers: ['last 2 Chrome versions'] },
+          modules: false,
+          loose: true,
+          useBuiltIns: true
+        }
+      ]
+    ];
+  }
+
  return babelrc;
 }

--- a/parity/user_defaults.rs
+++ b/parity/user_defaults.rs
@ -128,7 +128,13 @@ impl Default for UserDefaults {
 impl UserDefaults {
 	pub fn load<P>(path: P) -> Result<Self, String> where P: AsRef<Path> {
 		match File::open(path) {
-			Ok(file) => from_reader(file).map_err(|e| e.to_string()),
+			Ok(file) => match from_reader(file) {
+				Ok(defaults) => Ok(defaults),
+				Err(e) => {
+					warn!("Error loading user defaults file: {:?}", e);
+					Ok(UserDefaults::default())
+				},
+			},
 			_ => Ok(UserDefaults::default()),
 		}
 	}