diff --git a/src/chainfilter.rs b/src/chainfilter.rs
index 076263fbb..e1804c191 100644
--- a/src/chainfilter.rs
+++ b/src/chainfilter.rs
@@ -18,7 +18,7 @@
 //!			let filter = ChainFilter::new(&cache, index_size, bloom_levels);	
 //!			let block_number = 39;
 //!			let mut bloom = H2048::new();
-//!			bloom.shift_bloom(&address.sha3());
+//!			bloom.shift_bloomed(&address.sha3());
 //!			filter.add_bloom(&bloom, block_number)
 //!		};
 //!		
@@ -296,14 +296,14 @@ impl<'a, D> ChainFilter<'a, D> where D: FilterDataSource
 	/// Returns numbers of blocks that may contain Address.
 	pub fn blocks_with_address(&self, address: &Address, from_block: usize, to_block: usize) -> Vec<usize> {
 		let mut bloom = H2048::new();
-		bloom.shift_bloom(&address.sha3());
+		bloom.shift_bloomed(&address.sha3());
 		self.blocks_with_bloom(&bloom, from_block, to_block)
 	}
 
 	/// Returns numbers of blocks that may contain Topic.
 	pub fn blocks_with_topic(&self, topic: &H256, from_block: usize, to_block: usize) -> Vec<usize> {
 		let mut bloom = H2048::new();
-		bloom.shift_bloom(&topic.sha3());
+		bloom.shift_bloomed(&topic.sha3());
 		self.blocks_with_bloom(&bloom, from_block, to_block)
 	}
 
@@ -415,7 +415,7 @@ mod tests {
 			let filter = ChainFilter::new(&cache, index_size, bloom_levels);
 			let block_number = 23;
 			let mut bloom = H2048::new();
-			bloom.shift_bloom(&topic.sha3());
+			bloom.shift_bloomed(&topic.sha3());
 			filter.add_bloom(&bloom, block_number)
 		};
 
diff --git a/src/common.rs b/src/common.rs
new file mode 100644
index 000000000..39294155c
--- /dev/null
+++ b/src/common.rs
@@ -0,0 +1,7 @@
+pub use standard::*;
+pub use error::*;
+pub use hash::*;
+pub use uint::*;
+pub use bytes::*;
+pub use vector::*;
+pub use sha3::*;
diff --git a/src/error.rs b/src/error.rs
index 24b0cc87e..fbe57a98b 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,6 +1,8 @@
 //! General error types for use in ethcore.
 
-use rustc_serialize::hex::*;
+use rustc_serialize::hex::FromHexError;
+use network::NetworkError;
+use rlp::DecoderError;
 
 #[derive(Debug)]
 pub enum BaseDataError {
@@ -9,22 +11,58 @@ pub enum BaseDataError {
 
 #[derive(Debug)]
 /// General error type which should be capable of representing all errors in ethcore.
-pub enum EthcoreError {
+pub enum UtilError {
+	Crypto(::crypto::CryptoError),
+	Io(::std::io::Error),
+	AddressParse(::std::net::AddrParseError),
+	AddressResolve(Option<::std::io::Error>),
 	FromHex(FromHexError),
 	BaseData(BaseDataError),
+	Network(NetworkError),
+	Decoder(DecoderError),
 	BadSize,
 	UnknownName,
 }
 
-impl From<FromHexError> for EthcoreError {
-	fn from(err: FromHexError) -> EthcoreError {
-		EthcoreError::FromHex(err)
+impl From<FromHexError> for UtilError {
+	fn from(err: FromHexError) -> UtilError {
+		UtilError::FromHex(err)
 	}
 }
 
-impl From<BaseDataError> for EthcoreError {
-	fn from(err: BaseDataError) -> EthcoreError {
-		EthcoreError::BaseData(err)
+impl From<BaseDataError> for UtilError {
+	fn from(err: BaseDataError) -> UtilError {
+		UtilError::BaseData(err)
+	}
+}
+
+impl From<NetworkError> for UtilError {
+	fn from(err: NetworkError) -> UtilError {
+		UtilError::Network(err)
+	}
+}
+
+impl From<::std::io::Error> for UtilError {
+	fn from(err: ::std::io::Error) -> UtilError {
+		UtilError::Io(err)
+	}
+}
+
+impl From<::crypto::CryptoError> for UtilError {
+	fn from(err: ::crypto::CryptoError) -> UtilError {
+		UtilError::Crypto(err)
+	}
+}
+
+impl From<::std::net::AddrParseError> for UtilError {
+	fn from(err: ::std::net::AddrParseError) -> UtilError {
+		UtilError::AddressParse(err)
+	}
+}
+
+impl From<::rlp::DecoderError> for UtilError {
+	fn from(err: ::rlp::DecoderError) -> UtilError {
+		UtilError::Decoder(err)
 	}
 }
 
@@ -32,9 +70,9 @@ impl From<BaseDataError> for EthcoreError {
 /*#![feature(concat_idents)]
 macro_rules! assimilate {
     ($name:ident) => (
-		impl From<concat_idents!($name, Error)> for EthcoreError {
-			fn from(err: concat_idents!($name, Error)) -> EthcoreError {
-				EthcoreError:: $name (err)
+		impl From<concat_idents!($name, Error)> for Error {
+			fn from(err: concat_idents!($name, Error)) -> Error {
+				Error:: $name (err)
 			}
 		}
     )
diff --git a/src/hash.rs b/src/hash.rs
index 9eafa5dfb..087454ceb 100644
--- a/src/hash.rs
+++ b/src/hash.rs
@@ -4,10 +4,10 @@ use std::str::FromStr;
 use std::fmt;
 use std::ops;
 use std::hash::{Hash, Hasher};
-use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitAnd, BitXor};
+use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitOrAssign, BitAnd, BitXor};
 use std::cmp::{PartialOrd, Ordering};
 use rustc_serialize::hex::*;
-use error::EthcoreError;
+use error::UtilError;
 use rand::Rng;
 use rand::os::OsRng;
 use bytes::{BytesConvertable,Populatable};
@@ -19,15 +19,18 @@ use uint::U256;
 /// Note: types implementing `FixedHash` must be also `BytesConvertable`.
 pub trait FixedHash: Sized + BytesConvertable + Populatable {
 	fn new() -> Self;
+	/// Synonym for `new()`. Prefer to new as it's more readable.
+	fn zero() -> Self;
 	fn random() -> Self;
 	fn randomize(&mut self);
 	fn size() -> usize;
 	fn from_slice(src: &[u8]) -> Self;
 	fn clone_from_slice(&mut self, src: &[u8]) -> usize;
 	fn copy_to(&self, dest: &mut [u8]);
-	fn shift_bloom<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash;
+	fn shift_bloomed<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash;
+	fn with_bloomed<T>(mut self, b: &T) -> Self where T: FixedHash { self.shift_bloomed(b); self }
 	fn bloom_part<T>(&self, m: usize) -> T where T: FixedHash;
-	fn contains_bloom<T>(&self, b: &T) -> bool where T: FixedHash;
+	fn contains_bloomed<T>(&self, b: &T) -> bool where T: FixedHash;
 	fn contains<'a>(&'a self, b: &'a Self) -> bool;
 	fn is_zero(&self) -> bool;
 }
@@ -64,6 +67,10 @@ macro_rules! impl_hash {
 				$from([0; $size])
 			}
 
+			fn zero() -> $from {
+				$from([0; $size])
+			}
+
 			fn random() -> $from {
 				let mut hash = $from::new();
 				hash.randomize();
@@ -103,11 +110,12 @@ macro_rules! impl_hash {
 				}
 			}
 
-			fn shift_bloom<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash {
+			fn shift_bloomed<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash {
 				let bp: Self = b.bloom_part($size);
 				let new_self = &bp | self;
 
 				// impl |= instead
+				// TODO: that's done now!
 
 				unsafe {
 					use std::{mem, ptr};
@@ -153,7 +161,7 @@ macro_rules! impl_hash {
 				ret
 			}
 
-			fn contains_bloom<T>(&self, b: &T) -> bool where T: FixedHash {
+			fn contains_bloomed<T>(&self, b: &T) -> bool where T: FixedHash {
 				let bp: Self = b.bloom_part($size);
 				self.contains(&bp)
 			}
@@ -168,11 +176,10 @@ macro_rules! impl_hash {
 		}
 
 		impl FromStr for $from {
-			type Err = EthcoreError;
-
-			fn from_str(s: &str) -> Result<$from, EthcoreError> {
+			type Err = UtilError;
+			fn from_str(s: &str) -> Result<$from, UtilError> {
 				let a = try!(s.from_hex());
-				if a.len() != $size { return Err(EthcoreError::BadSize); }
+				if a.len() != $size { return Err(UtilError::BadSize); }
 				let mut ret = $from([0;$size]);
 				for i in 0..$size {
 					ret.0[i] = a[i];
@@ -299,6 +306,15 @@ macro_rules! impl_hash {
 			}
 		}
 
+		/// Moving BitOrAssign
+		impl<'a> BitOrAssign<&'a $from> for $from {
+			fn bitor_assign(&mut self, rhs: &'a Self) {
+				for i in 0..$size {
+					self.0[i] = self.0[i] | rhs.0[i];
+				}
+			}
+		}
+
 		/// BitAnd on references
 		impl <'a> BitAnd for &'a $from {
 			type Output = $from;
@@ -352,6 +368,8 @@ macro_rules! impl_hash {
 			pub fn hex(&self) -> String {
 				format!("{}", self)
 			}
+
+			pub fn from_bloomed<T>(b: &T) -> Self where T: FixedHash { b.bloom_part($size) }
 		}
 	}
 }
@@ -417,6 +435,11 @@ impl_hash!(H520, 65);
 impl_hash!(H1024, 128);
 impl_hash!(H2048, 256);
 
+/// Constant address for point 0. Often used as a default.
+pub static ZERO_ADDRESS: Address = Address([0x00; 20]);
+/// Constant 256-bit datum for 0. Often used as a default.
+pub static ZERO_H256: H256 = H256([0x00; 32]);
+
 #[cfg(test)]
 mod tests {
 	use hash::*;
@@ -448,7 +471,7 @@ mod tests {
 	}
 
 	#[test]
-	fn shift_bloom() {
+	fn shift_bloomed() {
 		use sha3::Hashable;
 
 		let bloom = H2048::from_str("00000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002020000000000000000000000000000000000000000000008000000001000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
@@ -456,17 +479,17 @@ mod tests {
 		let topic = H256::from_str("02c69be41d0b7e40352fc85be1cd65eb03d40ef8427a0ca4596b1ead9a00e9fc").unwrap();
 
 		let mut my_bloom = H2048::new();
-		assert!(!my_bloom.contains_bloom(&address.sha3()));
-		assert!(!my_bloom.contains_bloom(&topic.sha3()));
+		assert!(!my_bloom.contains_bloomed(&address.sha3()));
+		assert!(!my_bloom.contains_bloomed(&topic.sha3()));
 
-		my_bloom.shift_bloom(&address.sha3());
-		assert!(my_bloom.contains_bloom(&address.sha3()));
-		assert!(!my_bloom.contains_bloom(&topic.sha3()));
+		my_bloom.shift_bloomed(&address.sha3());
+		assert!(my_bloom.contains_bloomed(&address.sha3()));
+		assert!(!my_bloom.contains_bloomed(&topic.sha3()));
 
-		my_bloom.shift_bloom(&topic.sha3());
+		my_bloom.shift_bloomed(&topic.sha3());
 		assert_eq!(my_bloom, bloom);
-		assert!(my_bloom.contains_bloom(&address.sha3()));
-		assert!(my_bloom.contains_bloom(&topic.sha3()));
+		assert!(my_bloom.contains_bloomed(&address.sha3()));
+		assert!(my_bloom.contains_bloomed(&topic.sha3()));
 	}
 
 	#[test]
diff --git a/src/lib.rs b/src/lib.rs
index a061a72cd..de2cdbdf7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(op_assign_traits)]
 //! Ethcore-util library
 //!
 //! ### Rust version:
@@ -48,6 +49,8 @@ extern crate secp256k1;
 extern crate arrayvec;
 extern crate elastic_array;
 
+pub mod standard;
+pub mod common;
 pub mod error;
 pub mod hash;
 pub mod uint;
@@ -67,6 +70,20 @@ pub mod nibbleslice;
 pub mod heapsizeof;
 pub mod squeeze;
 pub mod semantic_version;
-
 pub mod network;
 
+pub use common::*;
+pub use rlp::*;
+pub use hashdb::*;
+pub use memorydb::*;
+pub use overlaydb::*;
+pub use math::*;
+pub use chainfilter::*;
+pub use crypto::*;
+pub use triehash::*;
+pub use trie::*;
+pub use nibbleslice::*;
+pub use heapsizeof::*;
+pub use squeeze::*;
+pub use semantic_version::*;
+pub use network::*;
diff --git a/src/network/connection.rs b/src/network/connection.rs
index 131aae318..efa0059eb 100644
--- a/src/network/connection.rs
+++ b/src/network/connection.rs
@@ -7,7 +7,8 @@ use bytes::*;
 use rlp::*;
 use std::io::{self, Cursor, Read};
 use network::host::{Host};
-use network::Error;
+use error::*;
+use network::NetworkError;
 use network::handshake::Handshake;
 use crypto;
 use rcrypto::blockmodes::*;
@@ -158,7 +159,7 @@ pub struct EncryptedConnection {
 }
 
 impl EncryptedConnection {
-	pub fn new(handshake: Handshake) -> Result<EncryptedConnection, Error> {
+	pub fn new(handshake: Handshake) -> Result<EncryptedConnection, UtilError> {
 		let shared = try!(crypto::ecdh::agree(handshake.ecdhe.secret(), &handshake.remote_public));
 		let mut nonce_material = H512::new();
 		if handshake.originated {
@@ -207,7 +208,7 @@ impl EncryptedConnection {
 		})
 	}
 
-	pub fn send_packet(&mut self, payload: &[u8]) -> Result<(), Error> {
+	pub fn send_packet(&mut self, payload: &[u8]) -> Result<(), UtilError> {
 		let mut header = RlpStream::new();
 		let len = payload.len() as usize;
 		header.append_raw(&[(len >> 16) as u8, (len >> 8) as u8, len as u8], 1);
@@ -233,16 +234,16 @@ impl EncryptedConnection {
 		Ok(())
 	}
 
-	fn read_header(&mut self, header: &[u8]) -> Result<(), Error> {
+	fn read_header(&mut self, header: &[u8]) -> Result<(), UtilError> {
 		if header.len() != ENCRYPTED_HEADER_LEN {
-			return Err(Error::Auth);
+			return Err(From::from(NetworkError::Auth));
 		}
 		EncryptedConnection::update_mac(&mut self.ingress_mac, &mut self.mac_encoder, &header[0..16]);
 		let mac = &header[16..];
 		let mut expected = H256::new();
 		self.ingress_mac.clone().finalize(&mut expected);
 		if mac != &expected[0..16] {
-			return Err(Error::Auth);
+			return Err(From::from(NetworkError::Auth));
 		}
 
 		let mut hdec = H128::new();
@@ -262,11 +263,11 @@ impl EncryptedConnection {
 		Ok(())
 	}
 
-	fn read_payload(&mut self, payload: &[u8]) -> Result<Packet, Error> {
+	fn read_payload(&mut self, payload: &[u8]) -> Result<Packet, UtilError> {
 		let padding = (16 - (self.payload_len  % 16)) % 16;
 		let full_length = self.payload_len + padding + 16;
 		if payload.len() != full_length {
-			return Err(Error::Auth);
+			return Err(From::from(NetworkError::Auth));
 		}
 		self.ingress_mac.update(&payload[0..payload.len() - 16]);
 		EncryptedConnection::update_mac(&mut self.ingress_mac, &mut self.mac_encoder, &[0u8; 0]);
@@ -274,7 +275,7 @@ impl EncryptedConnection {
 		let mut expected = H128::new();
 		self.ingress_mac.clone().finalize(&mut expected);
 		if mac != &expected[..] {
-			return Err(Error::Auth);
+			return Err(From::from(NetworkError::Auth));
 		}
 
 		let mut packet = vec![0u8; self.payload_len];
@@ -298,7 +299,7 @@ impl EncryptedConnection {
 		mac.update(&enc);
 	}
 
-	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>) -> Result<Option<Packet>, Error> {
+	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>) -> Result<Option<Packet>, UtilError> {
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		match self.read_state {
 			EncryptedConnectionState::Header => {
@@ -323,13 +324,13 @@ impl EncryptedConnection {
 		}
 	}
 
-	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		try!(self.connection.writable());
 		Ok(())
 	}
 
-	pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		self.connection.expect(ENCRYPTED_HEADER_LEN);
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		self.idle_timeout = event_loop.timeout_ms(self.connection.token, 1800).ok();
@@ -337,7 +338,7 @@ impl EncryptedConnection {
 		Ok(())
 	}
 
-	pub fn reregister(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn reregister(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		try!(self.connection.reregister(event_loop));
 		Ok(())
 	}
diff --git a/src/network/handshake.rs b/src/network/handshake.rs
index 4df8cbe8b..d9e280bfe 100644
--- a/src/network/handshake.rs
+++ b/src/network/handshake.rs
@@ -7,7 +7,8 @@ use crypto::*;
 use crypto;
 use network::connection::{Connection};
 use network::host::{NodeId, Host, HostInfo};
-use network::Error;
+use error::*;
+use network::NetworkError;
 
 #[derive(PartialEq, Eq, Debug)]
 enum HandshakeState {
@@ -35,7 +36,7 @@ const AUTH_PACKET_SIZE: usize = 307;
 const ACK_PACKET_SIZE: usize = 210;
 
 impl Handshake {
-	pub fn new(token: Token, id: &NodeId, socket: TcpStream, nonce: &H256) -> Result<Handshake, Error> {
+	pub fn new(token: Token, id: &NodeId, socket: TcpStream, nonce: &H256) -> Result<Handshake, UtilError> {
 		Ok(Handshake {
 			id: id.clone(),
 			connection: Connection::new(token, socket),
@@ -51,7 +52,7 @@ impl Handshake {
 		})
 	}
 
-	pub fn start(&mut self, host: &HostInfo, originated: bool) -> Result<(), Error> {
+	pub fn start(&mut self, host: &HostInfo, originated: bool) -> Result<(), UtilError> {
 		self.originated = originated;
 		if originated {
 			try!(self.write_auth(host));
@@ -67,7 +68,7 @@ impl Handshake {
 		self.state == HandshakeState::StartSession
 	}
 
-	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<(), Error> {
+	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<(), UtilError> {
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		match self.state {
 			HandshakeState::ReadingAuth => {
@@ -96,7 +97,7 @@ impl Handshake {
 		Ok(())
 	}
 
-	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>, _host: &HostInfo) -> Result<(), Error> {
+	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>, _host: &HostInfo) -> Result<(), UtilError> {
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		try!(self.connection.writable());
 		if self.state != HandshakeState::StartSession {
@@ -105,14 +106,14 @@ impl Handshake {
 		Ok(())
 	}
 
-	pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
 		self.idle_timeout = event_loop.timeout_ms(self.connection.token, 1800).ok();
 		try!(self.connection.register(event_loop));
 		Ok(())
 	}
 
-	fn read_auth(&mut self, host: &HostInfo, data: &[u8]) -> Result<(), Error> {
+	fn read_auth(&mut self, host: &HostInfo, data: &[u8]) -> Result<(), UtilError> {
 		trace!(target:"net", "Received handshake auth to {:?}", self.connection.socket.peer_addr());
 		assert!(data.len() == AUTH_PACKET_SIZE);
 		self.auth_cipher = data.to_vec();
@@ -128,12 +129,12 @@ impl Handshake {
 		let spub = try!(ec::recover(&signature, &(&shared ^ &self.remote_nonce)));
 		if &spub.sha3()[..] != hepubk {
 			trace!(target:"net", "Handshake hash mismath with {:?}", self.connection.socket.peer_addr());
-			return Err(Error::Auth);
+			return Err(From::from(NetworkError::Auth));
 		};
 		self.write_ack()
 	}
 
-	fn read_ack(&mut self, host: &HostInfo, data: &[u8]) -> Result<(), Error> {
+	fn read_ack(&mut self, host: &HostInfo, data: &[u8]) -> Result<(), UtilError> {
 		trace!(target:"net", "Received handshake auth to {:?}", self.connection.socket.peer_addr());
 		assert!(data.len() == ACK_PACKET_SIZE);
 		self.ack_cipher = data.to_vec();
@@ -143,7 +144,7 @@ impl Handshake {
 		Ok(())
 	}
 
-	fn write_auth(&mut self, host: &HostInfo) -> Result<(), Error> {
+	fn write_auth(&mut self, host: &HostInfo) -> Result<(), UtilError> {
 		trace!(target:"net", "Sending handshake auth to {:?}", self.connection.socket.peer_addr());
 		let mut data = [0u8; /*Signature::SIZE*/ 65 + /*H256::SIZE*/ 32 + /*Public::SIZE*/ 64 + /*H256::SIZE*/ 32 + 1]; //TODO: use associated constants
 		let len = data.len();
@@ -169,7 +170,7 @@ impl Handshake {
 		Ok(())
 	}
 
-	fn write_ack(&mut self) -> Result<(), Error> {
+	fn write_ack(&mut self) -> Result<(), UtilError> {
 		trace!(target:"net", "Sending handshake ack to {:?}", self.connection.socket.peer_addr());
 		let mut data = [0u8; 1 + /*Public::SIZE*/ 64 + /*H256::SIZE*/ 32]; //TODO: use associated constants
 		let len = data.len();
diff --git a/src/network/host.rs b/src/network/host.rs
index b9ca0152b..f48b9eb2d 100644
--- a/src/network/host.rs
+++ b/src/network/host.rs
@@ -13,7 +13,8 @@ use rlp::*;
 use time::Tm;
 use network::handshake::Handshake;
 use network::session::{Session, SessionData};
-use network::{Error, ProtocolHandler};
+use error::*;
+use network::ProtocolHandler;
 
 const _DEFAULT_PORT: u16 = 30304;
 
@@ -53,7 +54,7 @@ pub struct NodeEndpoint {
 }
 
 impl NodeEndpoint {
-	fn from_str(s: &str) -> Result<NodeEndpoint, Error> {
+	fn from_str(s: &str) -> Result<NodeEndpoint, UtilError> {
 		let address = s.to_socket_addrs().map(|mut i| i.next());
 		match address {
 			Ok(Some(a)) => Ok(NodeEndpoint {
@@ -61,8 +62,8 @@ impl NodeEndpoint {
 				address_str: s.to_string(),
 				udp_port: a.port()
 			}),
-			Ok(_) => Err(Error::AddressResolve(None)),
-			Err(e) => Err(Error::AddressResolve(Some(e)))
+			Ok(_) => Err(UtilError::AddressResolve(None)),
+			Err(e) => Err(UtilError::AddressResolve(Some(e)))
 		}
 	}
 }
@@ -81,7 +82,7 @@ struct Node {
 }
 
 impl FromStr for Node {
-	type Err = Error;
+	type Err = UtilError;
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
 		let (id, endpoint) = if &s[0..8] == "enode://" && s.len() > 136 && &s[136..137] == "@" {
 			(try!(NodeId::from_str(&s[8..136])), try!(NodeEndpoint::from_str(&s[137..])))
@@ -189,7 +190,7 @@ impl<'s> HostIo<'s> {
 	}
 
 	/// Send a packet over the network to another peer.
-	pub fn send(&mut self, peer: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), Error> {
+	pub fn send(&mut self, peer: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), UtilError> {
 		match self.connections.get_mut(Token(peer)) {
 			Some(&mut ConnectionEntry::Session(ref mut s)) => {
 				s.send_packet(self.protocol, packet_id as u8, &data).unwrap_or_else(|e| {
@@ -204,7 +205,7 @@ impl<'s> HostIo<'s> {
 	}
 
 	/// Respond to a current network message. Panics if no there is no packet in the context.
-	pub fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), Error> {
+	pub fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), UtilError> {
 		match self.session {
 			Some(session) => self.send(session.as_usize(), packet_id, data),
 			None => {
@@ -214,7 +215,7 @@ impl<'s> HostIo<'s> {
 	}
 
 	/// Register a new IO timer. Returns a new timer toke. 'ProtocolHandler::timeout' will be called with the token.
-	pub fn register_timer(&mut self, ms: u64) -> Result<TimerToken, Error>{
+	pub fn register_timer(&mut self, ms: u64) -> Result<TimerToken, UtilError>{
 		match self.timers.insert(UserTimer {
 			delay: ms,
 			protocol: self.protocol,
@@ -292,7 +293,7 @@ pub struct Host {
 }
 
 impl Host {
-	pub fn start(event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn start(event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		let config = NetworkConfiguration::new();
 		/*
 		match ::ifaces::Interface::get_all().unwrap().into_iter().filter(|x| x.kind == ::ifaces::Kind::Packet && x.addr.is_some()).next() {
diff --git a/src/network/mod.rs b/src/network/mod.rs
index df0da2c13..cdce08d00 100644
--- a/src/network/mod.rs
+++ b/src/network/mod.rs
@@ -69,49 +69,23 @@ pub enum DisconnectReason
 }
 
 #[derive(Debug)]
-pub enum Error {
-	Crypto(::crypto::CryptoError),
-	Io(::std::io::Error),
+pub enum NetworkError {
 	Auth,
 	BadProtocol,
-	AddressParse(::std::net::AddrParseError),
-	AddressResolve(Option<::std::io::Error>),
-	NodeIdParse(::error::EthcoreError),
 	PeerNotFound,
-	Disconnect(DisconnectReason)
+	Disconnect(DisconnectReason),
+	Mio(::std::io::Error),
 }
 
-impl From<::std::io::Error> for Error {
-	fn from(err: ::std::io::Error) -> Error {
-		Error::Io(err)
+impl From<::rlp::DecoderError> for NetworkError {
+	fn from(_err: ::rlp::DecoderError) -> NetworkError {
+		NetworkError::Auth
 	}
 }
 
-impl From<::crypto::CryptoError> for Error {
-	fn from(err: ::crypto::CryptoError) -> Error {
-		Error::Crypto(err)
-	}
-}
-
-impl From<::std::net::AddrParseError> for Error {
-	fn from(err: ::std::net::AddrParseError) -> Error {
-		Error::AddressParse(err)
-	}
-}
-impl From<::error::EthcoreError> for Error {
-	fn from(err: ::error::EthcoreError) -> Error {
-		Error::NodeIdParse(err)
-	}
-}
-impl From<::rlp::DecoderError> for Error {
-	fn from(_err: ::rlp::DecoderError) -> Error {
-		Error::Auth
-	}
-}
-
-impl From<::mio::NotifyError<host::HostMessage>> for Error {
-	fn from(_err: ::mio::NotifyError<host::HostMessage>) -> Error {
-		Error::Io(::std::io::Error::new(::std::io::ErrorKind::ConnectionAborted, "Network IO notification error"))
+impl From<::mio::NotifyError<host::HostMessage>> for NetworkError {
+	fn from(_err: ::mio::NotifyError<host::HostMessage>) -> NetworkError {
+		NetworkError::Mio(::std::io::Error::new(::std::io::ErrorKind::ConnectionAborted, "Network IO notification error"))
 	}
 }
 
diff --git a/src/network/service.rs b/src/network/service.rs
index 7598ffdd6..23cbb57d9 100644
--- a/src/network/service.rs
+++ b/src/network/service.rs
@@ -1,6 +1,7 @@
 use std::thread::{self, JoinHandle};
 use mio::*;
-use network::{Error, ProtocolHandler};
+use error::*;
+use network::{NetworkError, ProtocolHandler};
 use network::host::{Host, HostMessage, PeerId, PacketId, ProtocolId};
 
 /// IO Service with networking
@@ -11,7 +12,7 @@ pub struct NetworkService {
 
 impl NetworkService {
 	/// Starts IO event loop
-	pub fn start() -> Result<NetworkService, Error> {
+	pub fn start() -> Result<NetworkService, UtilError> {
 		let mut event_loop = EventLoop::new().unwrap();
         let channel = event_loop.channel();
 		let thread = thread::spawn(move || {
@@ -24,7 +25,7 @@ impl NetworkService {
 	}
 
 	/// Send a message over the network. Normaly `HostIo::send` should be used. This can be used from non-io threads.
-	pub fn send(&mut self, peer: &PeerId, packet_id: PacketId, protocol: ProtocolId, data: &[u8]) -> Result<(), Error> {
+	pub fn send(&mut self, peer: &PeerId, packet_id: PacketId, protocol: ProtocolId, data: &[u8]) -> Result<(), NetworkError> {
 		try!(self.host_channel.send(HostMessage::Send {
 			peer: *peer,
 			packet_id: packet_id,
@@ -35,7 +36,7 @@ impl NetworkService {
 	}
 
 	/// Regiter a new protocol handler with the event loop.
-	pub fn register_protocol(&mut self, handler: Box<ProtocolHandler+Send>, protocol: ProtocolId, versions: &[u8]) -> Result<(), Error> {
+	pub fn register_protocol(&mut self, handler: Box<ProtocolHandler+Send>, protocol: ProtocolId, versions: &[u8]) -> Result<(), NetworkError> {
 		try!(self.host_channel.send(HostMessage::AddHandler {
 			handler: handler,
 			protocol: protocol,
diff --git a/src/network/session.rs b/src/network/session.rs
index 8e89ff2c4..141898e24 100644
--- a/src/network/session.rs
+++ b/src/network/session.rs
@@ -3,7 +3,8 @@ use hash::*;
 use rlp::*;
 use network::connection::{EncryptedConnection, Packet};
 use network::handshake::Handshake;
-use network::{Error, DisconnectReason};
+use error::*;
+use network::{NetworkError, DisconnectReason};
 use network::host::*;
 
 pub struct Session {
@@ -64,7 +65,7 @@ const PACKET_USER: u8 = 0x10;
 const PACKET_LAST: u8 = 0x7f;
 
 impl Session {
-	pub fn new(h: Handshake, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<Session, Error> {
+	pub fn new(h: Handshake, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<Session, UtilError> {
 		let id = h.id.clone();
 		let connection = try!(EncryptedConnection::new(h));
 		let mut session = Session {
@@ -87,14 +88,14 @@ impl Session {
 		self.had_hello
 	}
 
-	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<SessionData, Error> {
+	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<SessionData, UtilError> {
 		match try!(self.connection.readable(event_loop)) {
-			Some(data)  => self.read_packet(data, host),
+			Some(data) => Ok(try!(self.read_packet(data, host))),
 			None => Ok(SessionData::None)
 		}
 	}
 
-	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>, _host: &HostInfo) -> Result<(), Error> {
+	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>, _host: &HostInfo) -> Result<(), UtilError> {
 		self.connection.writable(event_loop)
 	}
 
@@ -102,11 +103,11 @@ impl Session {
 		self.info.capabilities.iter().any(|c| c.protocol == protocol)
 	}
 
-	pub fn reregister(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+	pub fn reregister(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), UtilError> {
 		self.connection.reregister(event_loop)
 	}
 
-	pub fn send_packet(&mut self, protocol: &str, packet_id: u8, data: &[u8]) -> Result<(), Error> {
+	pub fn send_packet(&mut self, protocol: &str, packet_id: u8, data: &[u8]) -> Result<(), UtilError> {
 		let mut i = 0usize;
 		while protocol != self.info.capabilities[i].protocol {
 			i += 1;
@@ -122,13 +123,13 @@ impl Session {
 		self.connection.send_packet(&rlp.out())
 	}
 
-	fn read_packet(&mut self, packet: Packet, host: &HostInfo) -> Result<SessionData, Error> {
+	fn read_packet(&mut self, packet: Packet, host: &HostInfo) -> Result<SessionData, UtilError> {
 		if packet.data.len() < 2 {
-			return Err(Error::BadProtocol);
+			return Err(From::from(NetworkError::BadProtocol));
 		}
 		let packet_id = packet.data[0];
 		if packet_id != PACKET_HELLO && packet_id != PACKET_DISCONNECT && !self.had_hello {
-			return Err(Error::BadProtocol);
+			return Err(From::from(NetworkError::BadProtocol));
 		}
 		match packet_id {
 			PACKET_HELLO => {
@@ -136,7 +137,7 @@ impl Session {
 				try!(self.read_hello(&rlp, host));
 				Ok(SessionData::Ready)
 			},
-			PACKET_DISCONNECT => Err(Error::Disconnect(DisconnectReason::DisconnectRequested)),
+			PACKET_DISCONNECT => Err(From::from(NetworkError::Disconnect(DisconnectReason::DisconnectRequested))),
 			PACKET_PING => {
 				try!(self.write_pong());
 				Ok(SessionData::None)
@@ -165,7 +166,7 @@ impl Session {
 		}
 	}
 
-	fn write_hello(&mut self, host: &HostInfo) -> Result<(), Error>  {
+	fn write_hello(&mut self, host: &HostInfo) -> Result<(), UtilError> {
 		let mut rlp = RlpStream::new();
 		rlp.append_raw(&[PACKET_HELLO as u8], 0);
 		rlp.append_list(5)
@@ -177,7 +178,7 @@ impl Session {
 		self.connection.send_packet(&rlp.out())
 	}
 
-	fn read_hello(&mut self, rlp: &UntrustedRlp, host: &HostInfo) -> Result<(), Error> {
+	fn read_hello(&mut self, rlp: &UntrustedRlp, host: &HostInfo) -> Result<(), UtilError> {
 		let protocol = try!(rlp.val_at::<u32>(0));
 		let client_version = try!(rlp.val_at::<String>(1));
 		let peer_caps = try!(rlp.val_at::<Vec<PeerCapabilityInfo>>(2));
@@ -218,37 +219,37 @@ impl Session {
 		trace!(target: "net", "Hello: {} v{} {} {:?}", client_version, protocol, id, caps);
 		self.info.capabilities = caps;
 		if protocol != host.protocol_version {
-			return Err(self.disconnect(DisconnectReason::UselessPeer));
+			return Err(From::from(self.disconnect(DisconnectReason::UselessPeer)));
 		}
 		self.had_hello = true;
 		Ok(())
 	}
 
-	fn write_ping(&mut self) -> Result<(), Error>  {
+	fn write_ping(&mut self) -> Result<(), UtilError>  {
 		self.send(try!(Session::prepare(PACKET_PING)))
 	}
 
-	fn write_pong(&mut self) -> Result<(), Error>  {
+	fn write_pong(&mut self) -> Result<(), UtilError>  {
 		self.send(try!(Session::prepare(PACKET_PONG)))
 	}
 
-	fn disconnect(&mut self, reason: DisconnectReason) -> Error {
+	fn disconnect(&mut self, reason: DisconnectReason) -> NetworkError {
 		let mut rlp = RlpStream::new();
 		rlp.append(&(PACKET_DISCONNECT as u32));
 		rlp.append_list(1);
 		rlp.append(&(reason.clone() as u32));
 		self.connection.send_packet(&rlp.out()).ok();
-		Error::Disconnect(reason)
+		NetworkError::Disconnect(reason)
 	}
 
-	fn prepare(packet_id: u8) -> Result<RlpStream, Error> {
+	fn prepare(packet_id: u8) -> Result<RlpStream, UtilError> {
 		let mut rlp = RlpStream::new();
 		rlp.append(&(packet_id as u32));
 		rlp.append_list(0);
 		Ok(rlp)
 	}
 
-	fn send(&mut self, rlp: RlpStream) -> Result<(), Error> {
+	fn send(&mut self, rlp: RlpStream) -> Result<(), UtilError> {
 		self.connection.send_packet(&rlp.out())
 	}
 }
diff --git a/src/overlaydb.rs b/src/overlaydb.rs
index b5bbf4299..5539a8893 100644
--- a/src/overlaydb.rs
+++ b/src/overlaydb.rs
@@ -66,7 +66,7 @@ impl OverlayDB {
 	///   assert!(m.exists(&key));				// key now still exists.
 	/// }
 	/// ```
-	pub fn commit(&mut self) -> Result<u32, EthcoreError> {
+	pub fn commit(&mut self) -> Result<u32, UtilError> {
 		let mut ret = 0u32;
 		for i in self.overlay.drain().into_iter() {
 			let (key, (value, rc)) = i;
diff --git a/src/rlp/mod.rs b/src/rlp/mod.rs
index 8aa816c04..fc0a4d288 100644
--- a/src/rlp/mod.rs
+++ b/src/rlp/mod.rs
@@ -32,7 +32,7 @@
 
 pub mod rlptraits;
 pub mod rlperrors;
-pub mod rlp;
+pub mod rlpin;
 pub mod untrusted_rlp;
 pub mod rlpstream;
 
@@ -42,8 +42,8 @@ mod tests;
 pub use self::rlperrors::DecoderError;
 pub use self::rlptraits::{Decoder, Decodable, View, Stream, Encodable, Encoder};
 pub use self::untrusted_rlp::{UntrustedRlp, UntrustedRlpIterator, PayloadInfo, Prototype};
-pub use self::rlp::{Rlp, RlpIterator};
-pub use self::rlpstream::{RlpStream};
+pub use self::rlpin::{Rlp, RlpIterator};
+pub use self::rlpstream::{RlpStream,RlpStandard};
 use super::hash::H256;
 
 pub const NULL_RLP: [u8; 1] = [0x80; 1];
diff --git a/src/rlp/rlp.rs b/src/rlp/rlpin.rs
similarity index 100%
rename from src/rlp/rlp.rs
rename to src/rlp/rlpin.rs
diff --git a/src/rlp/rlpstream.rs b/src/rlp/rlpstream.rs
index 97ae1b484..b8954ae6f 100644
--- a/src/rlp/rlpstream.rs
+++ b/src/rlp/rlpstream.rs
@@ -1,6 +1,8 @@
 use elastic_array::*;
-use bytes::ToBytes;
+use bytes::{Bytes, ToBytes};
 use rlp::{Stream, Encoder, Encodable};
+use hash::H256;
+use sha3::*;
 
 #[derive(Debug, Copy, Clone)]
 struct ListInfo {
@@ -213,6 +215,20 @@ impl Encoder for BasicEncoder {
 	}
 }
 
+pub trait RlpStandard {
+	fn rlp_append(&self, s: &mut RlpStream);
+
+	fn rlp_bytes(&self) -> Bytes {
+		let mut s = RlpStream::new();
+		self.rlp_append(&mut s);
+		s.out()
+	}
+
+	fn rlp_sha3(&self) -> H256 { self.rlp_bytes().sha3() }
+}
+
+// @debris TODO: implement Encoder for RlpStandard.
+
 impl<T> Encodable for T where T: ToBytes {
 	fn encode<E>(&self, encoder: &mut E) where E: Encoder {
 		encoder.emit_value(&self.to_bytes())
diff --git a/src/standard.rs b/src/standard.rs
new file mode 100644
index 000000000..b591220f3
--- /dev/null
+++ b/src/standard.rs
@@ -0,0 +1,21 @@
+pub use std::io;
+pub use std::str;
+pub use std::fmt;
+pub use std::slice;
+
+pub use std::path::Path;
+pub use std::str::{FromStr};
+pub use std::io::{Read,Write};
+pub use std::hash::{Hash, Hasher};
+pub use std::error::Error as StdError;
+
+pub use std::ops::*;
+pub use std::cmp::*;
+pub use std::cell::*;
+pub use std::collections::*;
+
+pub use rustc_serialize::json::Json;
+pub use rustc_serialize::base64::FromBase64;
+pub use rustc_serialize::hex::FromHex;
+
+pub use heapsize::HeapSizeOf;
diff --git a/src/triehash.rs b/src/triehash.rs
index de54bb3a7..66f9072b8 100644
--- a/src/triehash.rs
+++ b/src/triehash.rs
@@ -29,11 +29,8 @@ pub fn ordered_trie_root(input: Vec<Vec<u8>>) -> H256 {
 		// first put elements into btree to sort them by nibbles
 		// optimize it later
 		.into_iter()
-		.fold(BTreeMap::new(), | mut acc, vec | {
-			let len = acc.len();
-			acc.insert(rlp::encode(&len), vec);
-			acc
-		})
+		.enumerate()
+		.fold(BTreeMap::new(), | mut acc, (i, vec) | { acc.insert(rlp::encode(&i), vec); acc })
 		// then move them to a vector
 		.into_iter()
 		.map(|(k, v)| (as_nibbles(&k), v) )
diff --git a/src/uint.rs b/src/uint.rs
index 7fc11e2df..6fc8d19e1 100644
--- a/src/uint.rs
+++ b/src/uint.rs
@@ -424,6 +424,17 @@ macro_rules! construct_uint {
 			}
 		}
 
+		impl fmt::Display for $name {
+			fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+				let &$name(ref data) = self;
+				try!(write!(f, "0x"));
+				for ch in data.iter().rev() {
+					try!(write!(f, "{:02x}", ch));
+				}
+				Ok(())
+			}
+		}
+
 		impl Hash for $name {
 			fn hash<H>(&self, state: &mut H) where H: Hasher {
 				unsafe { state.write(::std::slice::from_raw_parts(self.0.as_ptr() as *mut u8, self.0.len() * 8)); }