diff --git a/ethcore/light/src/net/status.rs b/ethcore/light/src/net/status.rs
index 3e32f660943..3a09be3c218 100644
--- a/ethcore/light/src/net/status.rs
+++ b/ethcore/light/src/net/status.rs
@@ -373,7 +373,7 @@ pub fn write_announcement(announcement: &Announcement) -> Vec<u8> {
 mod tests {
 	use super::*;
 	use super::super::request_credits::FlowParams;
-	use util::{U256, H256, FixedHash};
+	use util::{U256, H256};
 	use rlp::{RlpStream, Stream ,UntrustedRlp, View};
 
 	#[test]
diff --git a/ethcore/light/src/on_demand/request.rs b/ethcore/light/src/on_demand/request.rs
index 3a72db51d9c..01792543c51 100644
--- a/ethcore/light/src/on_demand/request.rs
+++ b/ethcore/light/src/on_demand/request.rs
@@ -267,7 +267,7 @@ impl TransactionProof {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use util::{MemoryDB, Address, H256, FixedHash};
+	use util::{MemoryDB, Address, H256};
 	use util::trie::{Trie, TrieMut, SecTrieDB, SecTrieDBMut};
 	use util::trie::recorder::Recorder;
 
diff --git a/ethcore/src/account_provider/mod.rs b/ethcore/src/account_provider/mod.rs
index 5bb183d0bf7..f9b7727db69 100755
--- a/ethcore/src/account_provider/mod.rs
+++ b/ethcore/src/account_provider/mod.rs
@@ -23,7 +23,7 @@ use self::stores::{AddressBook, DappsSettingsStore, NewDappsPolicy};
 use std::fmt;
 use std::collections::{HashMap, HashSet};
 use std::time::{Instant, Duration};
-use util::{FixedHash, RwLock};
+use util::{RwLock};
 use ethstore::{SimpleSecretStore, SecretStore, Error as SSError, EthStore, EthMultiStore,
 	random_string, SecretVaultRef, StoreAccountRef};
 use ethstore::dir::MemoryDirectory;
diff --git a/ethcore/src/action_params.rs b/ethcore/src/action_params.rs
index cba8d7c6a1a..ef9c0052331 100644
--- a/ethcore/src/action_params.rs
+++ b/ethcore/src/action_params.rs
@@ -16,7 +16,7 @@
 
 //! Evm input params.
 use util::{Address, Bytes, Uint, U256};
-use util::hash::{H256, FixedHash};
+use util::hash::{H256};
 use util::sha3::{Hashable, SHA3_EMPTY};
 use ethjson;
 use types::executed::CallType;
diff --git a/ethcore/src/block.rs b/ethcore/src/block.rs
index 3626fdd3a62..67425ca862a 100644
--- a/ethcore/src/block.rs
+++ b/ethcore/src/block.rs
@@ -21,7 +21,7 @@ use std::sync::Arc;
 use std::collections::HashSet;
 
 use rlp::{UntrustedRlp, RlpStream, Encodable, Decodable, Decoder, DecoderError, View, Stream};
-use util::{Bytes, Address, Uint, FixedHash, Hashable, U256, H256, ordered_trie_root, SHA3_NULL_RLP};
+use util::{Bytes, Address, Uint, Hashable, U256, H256, ordered_trie_root, SHA3_NULL_RLP};
 use util::error::{Mismatch, OutOfBounds};
 
 use basic_types::{LogBloom, Seal};
@@ -618,7 +618,6 @@ mod tests {
 	use state_db::StateDB;
 	use views::BlockView;
 	use util::Address;
-	use util::hash::FixedHash;
 	use std::sync::Arc;
 	use transaction::SignedTransaction;
 
diff --git a/ethcore/src/builtin.rs b/ethcore/src/builtin.rs
index 89b9ff2fd3f..ca3b13181e5 100644
--- a/ethcore/src/builtin.rs
+++ b/ethcore/src/builtin.rs
@@ -18,7 +18,7 @@ use crypto::sha2::Sha256 as Sha256Digest;
 use crypto::ripemd160::Ripemd160 as Ripemd160Digest;
 use crypto::digest::Digest;
 use std::cmp::min;
-use util::{U256, H256, Hashable, FixedHash, BytesRef};
+use util::{U256, H256, Hashable, BytesRef};
 use ethkey::{Signature, recover as ec_recover};
 use ethjson;
 
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index edd585551c7..e7e2d439d55 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -25,7 +25,7 @@ use time::precise_time_ns;
 // util
 use util::{Bytes, PerfTimer, Itertools, Mutex, RwLock, MutexGuard, Hashable};
 use util::{journaldb, DBValue, TrieFactory, Trie};
-use util::{U256, H256, Address, H2048, Uint, FixedHash};
+use util::{U256, H256, Address, H2048, Uint};
 use util::trie::TrieSpec;
 use util::kvdb::*;
 
diff --git a/ethcore/src/client/registry.rs b/ethcore/src/client/registry.rs
index c8f750576fd..fb74ec36b99 100644
--- a/ethcore/src/client/registry.rs
+++ b/ethcore/src/client/registry.rs
@@ -5,7 +5,7 @@ use std::string::String;
 use std::result::Result;
 use std::fmt;
 use {util, ethabi};
-use util::{FixedHash, Uint};
+use util::{Uint};
 
 pub struct Registry {
 	contract: ethabi::Contract,
@@ -22,7 +22,7 @@ impl Registry {
 		}
 	}
 	fn as_string<T: fmt::Debug>(e: T) -> String { format!("{:?}", e) }
-	
+
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_data","type":"address"}],"name":"canReverse","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
 	pub fn can_reverse(&self, _data: &util::Address) -> Result<bool, String>
@@ -45,7 +45,7 @@ impl Registry {
 			vec![ethabi::Token::Address(_new.clone().0)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
+
 		Ok(())
 	}
 
@@ -318,7 +318,7 @@ impl Registry {
 			vec![]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
+
 		Ok(())
 	}
 
diff --git a/ethcore/src/engines/tendermint/params.rs b/ethcore/src/engines/tendermint/params.rs
index e380131888a..3dbdf4041a0 100644
--- a/ethcore/src/engines/tendermint/params.rs
+++ b/ethcore/src/engines/tendermint/params.rs
@@ -17,7 +17,7 @@
 //! Tendermint specific parameters.
 
 use ethjson;
-use util::{U256, Uint, Address, FixedHash};
+use util::{U256, Uint, Address};
 use time::Duration;
 use super::super::transition::Timeouts;
 use super::Step;
diff --git a/ethcore/src/engines/validator_set/contract.rs b/ethcore/src/engines/validator_set/contract.rs
index 91fbf5fab8b..adfdd1225c0 100644
--- a/ethcore/src/engines/validator_set/contract.rs
+++ b/ethcore/src/engines/validator_set/contract.rs
@@ -92,7 +92,7 @@ mod provider {
 	use std::result::Result;
 	use std::fmt;
 	use {util, ethabi};
-	use util::{FixedHash, Uint};
+	use util::{Uint};
 
 	pub struct Contract {
 		contract: ethabi::Contract,
@@ -108,7 +108,7 @@ mod provider {
 			}
 		}
 		fn as_string<T: fmt::Debug>(e: T) -> String { format!("{:?}", e) }
-		
+
 		/// Auto-generated from: `{"constant":false,"inputs":[{"name":"validator","type":"address"}],"name":"reportMalicious","outputs":[],"payable":false,"type":"function"}`
 		#[allow(dead_code)]
 		pub fn report_malicious(&self, validator: &util::Address) -> Result<(), String> {
@@ -117,7 +117,7 @@ mod provider {
 				vec![ethabi::Token::Address(validator.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 
@@ -129,7 +129,7 @@ mod provider {
 				vec![ethabi::Token::Address(validator.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 	}
@@ -159,7 +159,7 @@ mod tests {
 		assert!(vc.contains(&last_hash, &Address::from_str("7d577a597b2742b498cb5cf0c26cdcd726d39e6e").unwrap()));
 		assert!(vc.contains(&last_hash, &Address::from_str("82a978b3f5962a5b0957d9ee9eef472ee55b42f1").unwrap()));
 	}
-	
+
 	#[test]
 	fn reports_validators() {
 		let tap = Arc::new(AccountProvider::transient_provider());
@@ -173,12 +173,12 @@ mod tests {
 
 		client.miner().set_engine_signer(v1, "".into()).unwrap();
 		let mut header = Header::default();
-		let seal = vec![encode(&5u8).to_vec(), encode(&(&H520::default() as &[u8])).to_vec()];	
+		let seal = vec![encode(&5u8).to_vec(), encode(&(&H520::default() as &[u8])).to_vec()];
 		header.set_seal(seal);
 		header.set_author(v1);
 		header.set_number(2);
 		header.set_parent_hash(client.chain_info().best_block_hash);
-		
+
 		// `reportBenign` when the designated proposer releases block from the future (bad clock).
 		assert!(client.engine().verify_block_family(&header, &header, None).is_err());
 		// Seal a block.
diff --git a/ethcore/src/executive.rs b/ethcore/src/executive.rs
index d9f1b74132e..924f3353cb1 100644
--- a/ethcore/src/executive.rs
+++ b/ethcore/src/executive.rs
@@ -509,7 +509,7 @@ mod tests {
 	use std::sync::Arc;
 	use ethkey::{Generator, Random};
 	use super::*;
-	use util::{H256, U256, U512, Address, Uint, FixedHash, FromHex, FromStr};
+	use util::{H256, U256, U512, Address, Uint, FromHex, FromStr};
 	use util::bytes::BytesRef;
 	use action_params::{ActionParams, ActionValue};
 	use env_info::EnvInfo;
diff --git a/ethcore/src/migrations/state/v7.rs b/ethcore/src/migrations/state/v7.rs
index ea065550855..bcfaf8c5d4d 100644
--- a/ethcore/src/migrations/state/v7.rs
+++ b/ethcore/src/migrations/state/v7.rs
@@ -20,7 +20,7 @@
 use std::collections::HashMap;
 
 use util::Bytes;
-use util::{Address, FixedHash, H256};
+use util::{Address, H256};
 use util::kvdb::Database;
 use util::migration::{Batch, Config, Error, Migration, SimpleMigration, Progress};
 use util::sha3::Hashable;
diff --git a/ethcore/src/migrations/v10.rs b/ethcore/src/migrations/v10.rs
index a152657780a..45fc457bd59 100644
--- a/ethcore/src/migrations/v10.rs
+++ b/ethcore/src/migrations/v10.rs
@@ -24,7 +24,7 @@ use views::HeaderView;
 use bloom_journal::Bloom;
 use util::migration::{Error, Migration, Progress, Batch, Config};
 use util::journaldb;
-use util::{H256, FixedHash, Trie};
+use util::{H256, Trie};
 use util::{Database, DBTransaction};
 
 /// Account bloom upgrade routine. If bloom already present, does nothing.
diff --git a/ethcore/src/miner/service_transaction_checker.rs b/ethcore/src/miner/service_transaction_checker.rs
index 5a7ab04e920..8a97ed9dc45 100644
--- a/ethcore/src/miner/service_transaction_checker.rs
+++ b/ethcore/src/miner/service_transaction_checker.rs
@@ -62,12 +62,12 @@ mod provider {
 	use std::result::Result;
 	use std::fmt;
 	use {util, ethabi};
-	use util::{FixedHash, Uint};
+	use util::{Uint};
 
 	pub struct Contract {
 		contract: ethabi::Contract,
 		address: util::Address,
-		
+
 	}
 	impl Contract {
 		pub fn new(address: util::Address) -> Self
@@ -75,11 +75,11 @@ mod provider {
 			Contract {
 				contract: ethabi::Contract::new(ethabi::Interface::load(b"[{\"constant\":false,\"inputs\":[{\"name\":\"_new\",\"type\":\"address\"}],\"name\":\"setOwner\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"}],\"name\":\"certify\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"},{\"name\":\"_field\",\"type\":\"string\"}],\"name\":\"getAddress\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"}],\"name\":\"revoke\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"delegate\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"},{\"name\":\"_field\",\"type\":\"string\"}],\"name\":\"getUint\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_new\",\"type\":\"address\"}],\"name\":\"setDelegate\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"}],\"name\":\"certified\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_who\",\"type\":\"address\"},{\"name\":\"_field\",\"type\":\"string\"}],\"name\":\"get\",\"outputs\":[{\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"type\":\"function\"}]").expect("JSON is autogenerated; qed")),
 				address: address,
-				
+
 			}
 		}
 		fn as_string<T: fmt::Debug>(e: T) -> String { format!("{:?}", e) }
-		
+
 		/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_new","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"type":"function"}`
 		#[allow(dead_code)]
 		pub fn set_owner<F>(&self, do_call: &F, _new: &util::Address) -> Result<(), String>
@@ -89,7 +89,7 @@ mod provider {
 				vec![ethabi::Token::Address(_new.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 
@@ -102,7 +102,7 @@ mod provider {
 				vec![ethabi::Token::Address(_who.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 
@@ -128,7 +128,7 @@ mod provider {
 				vec![ethabi::Token::Address(_who.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 
@@ -180,7 +180,7 @@ mod provider {
 				vec![ethabi::Token::Address(_new.clone().0)]
 			).map_err(Self::as_string)?;
 			call.decode_output((do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-			
+
 			Ok(())
 		}
 
diff --git a/ethcore/src/miner/stratum.rs b/ethcore/src/miner/stratum.rs
index d887f1afadb..e67cbb5e139 100644
--- a/ethcore/src/miner/stratum.rs
+++ b/ethcore/src/miner/stratum.rs
@@ -25,7 +25,7 @@ use std::sync::{Arc, Weak};
 use std::net::{SocketAddr, AddrParseError};
 use std::fmt;
 
-use util::{H256, U256, FixedHash, H64, clean_0x};
+use util::{H256, U256, H64, clean_0x};
 use ethereum::ethash::Ethash;
 use ethash::SeedHashCompute;
 use util::Mutex;
diff --git a/ethcore/src/snapshot/account.rs b/ethcore/src/snapshot/account.rs
index c417a79a111..44c8093b7be 100644
--- a/ethcore/src/snapshot/account.rs
+++ b/ethcore/src/snapshot/account.rs
@@ -20,7 +20,7 @@ use account_db::{AccountDB, AccountDBMut};
 use basic_account::BasicAccount;
 use snapshot::Error;
 
-use util::{U256, FixedHash, H256, Bytes, HashDB, SHA3_EMPTY, SHA3_NULL_RLP};
+use util::{U256, H256, Bytes, HashDB, SHA3_EMPTY, SHA3_NULL_RLP};
 use util::trie::{TrieDB, Trie};
 use rlp::{RlpStream, Stream, UntrustedRlp, View};
 
@@ -179,7 +179,7 @@ mod tests {
 	use snapshot::tests::helpers::fill_storage;
 
 	use util::sha3::{SHA3_EMPTY, SHA3_NULL_RLP};
-	use util::{Address, FixedHash, H256, HashDB, DBValue};
+	use util::{Address, H256, HashDB, DBValue};
 	use rlp::{UntrustedRlp, View};
 
 	use std::collections::HashSet;
diff --git a/ethcore/src/snapshot/block.rs b/ethcore/src/snapshot/block.rs
index 03feb94558f..048724ec910 100644
--- a/ethcore/src/snapshot/block.rs
+++ b/ethcore/src/snapshot/block.rs
@@ -134,7 +134,7 @@ mod tests {
 	use super::AbridgedBlock;
 	use types::transaction::{Action, Transaction};
 
-	use util::{Address, H256, FixedHash, U256, Bytes};
+	use util::{Address, H256, U256, Bytes};
 
 	fn encode_block(b: &Block) -> Bytes {
 		b.rlp_bytes(::basic_types::Seal::With)
diff --git a/ethcore/src/snapshot/mod.rs b/ethcore/src/snapshot/mod.rs
index 53aa428b621..e8001e54b61 100644
--- a/ethcore/src/snapshot/mod.rs
+++ b/ethcore/src/snapshot/mod.rs
@@ -32,7 +32,7 @@ use views::BlockView;
 
 use util::{Bytes, Hashable, HashDB, DBValue, snappy, U256, Uint};
 use util::Mutex;
-use util::hash::{FixedHash, H256};
+use util::hash::{H256};
 use util::journaldb::{self, Algorithm, JournalDB};
 use util::kvdb::Database;
 use util::trie::{TrieDB, TrieDBMut, Trie, TrieMut};
diff --git a/ethcore/src/snapshot/tests/helpers.rs b/ethcore/src/snapshot/tests/helpers.rs
index 02ca268ec95..ed356346bce 100644
--- a/ethcore/src/snapshot/tests/helpers.rs
+++ b/ethcore/src/snapshot/tests/helpers.rs
@@ -22,7 +22,7 @@ use account_db::AccountDBMut;
 use rand::Rng;
 
 use util::DBValue;
-use util::hash::{FixedHash, H256};
+use util::hash::H256;
 use util::hashdb::HashDB;
 use util::trie::{Alphabet, StandardMap, SecTrieDBMut, TrieMut, ValueMode};
 use util::trie::{TrieDB, TrieDBMut, Trie};
diff --git a/ethcore/src/snapshot/tests/state.rs b/ethcore/src/snapshot/tests/state.rs
index 90c9e990fac..809e9fe216a 100644
--- a/ethcore/src/snapshot/tests/state.rs
+++ b/ethcore/src/snapshot/tests/state.rs
@@ -96,7 +96,7 @@ fn snap_and_restore() {
 fn get_code_from_prev_chunk() {
 	use std::collections::HashSet;
 	use rlp::{RlpStream, Stream};
-	use util::{HashDB, H256, FixedHash, U256, Hashable};
+	use util::{HashDB, H256, U256, Hashable};
 
 	use account_db::{AccountDBMut, AccountDB};
 
diff --git a/ethcore/src/spec/genesis.rs b/ethcore/src/spec/genesis.rs
index 072fb3f0fff..bf5ec46c127 100644
--- a/ethcore/src/spec/genesis.rs
+++ b/ethcore/src/spec/genesis.rs
@@ -14,7 +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/>.
 
-use util::{Address, H256, Uint, U256, FixedHash};
+use util::{Address, H256, Uint, U256};
 use util::sha3::SHA3_NULL_RLP;
 use ethjson;
 use super::seal::Seal;
diff --git a/ethcore/src/state/mod.rs b/ethcore/src/state/mod.rs
index 3c5a3bc09a8..c34f4304137 100644
--- a/ethcore/src/state/mod.rs
+++ b/ethcore/src/state/mod.rs
@@ -940,7 +940,7 @@ mod tests {
 	use rustc_serialize::hex::FromHex;
 	use super::*;
 	use ethkey::Secret;
-	use util::{U256, H256, FixedHash, Address, Hashable};
+	use util::{U256, H256, Address, Hashable};
 	use tests::helpers::*;
 	use devtools::*;
 	use env_info::EnvInfo;
diff --git a/ethcore/src/state_db.rs b/ethcore/src/state_db.rs
index 85d40109903..bfd1068cad4 100644
--- a/ethcore/src/state_db.rs
+++ b/ethcore/src/state_db.rs
@@ -454,7 +454,7 @@ impl state::Backend for StateDB {
 
 #[cfg(test)]
 mod tests {
-	use util::{U256, H256, FixedHash, Address, DBTransaction};
+	use util::{U256, H256, Address, DBTransaction};
 	use tests::helpers::*;
 	use state::{Account, Backend};
 	use util::log::init_log;
diff --git a/ethcore/src/types/filter.rs b/ethcore/src/types/filter.rs
index 5749c34151f..1b6043129db 100644
--- a/ethcore/src/types/filter.rs
+++ b/ethcore/src/types/filter.rs
@@ -113,7 +113,6 @@ impl Filter {
 
 #[cfg(test)]
 mod tests {
-	use util::FixedHash;
 	use filter::Filter;
 	use client::BlockId;
 	use log_entry::LogEntry;
diff --git a/ethcrypto/src/lib.rs b/ethcrypto/src/lib.rs
index 07c821752a9..a4d426b54b8 100644
--- a/ethcrypto/src/lib.rs
+++ b/ethcrypto/src/lib.rs
@@ -195,7 +195,7 @@ pub mod ecies {
 	use rcrypto::sha2::Sha256;
 	use rcrypto::hmac::Hmac;
 	use rcrypto::mac::Mac;
-	use bigint::hash::{FixedHash, H128};
+	use bigint::hash::H128;
 	use ethkey::{Random, Generator, Public, Secret};
 	use {Error, ecdh, aes, Keccak256};
 
diff --git a/ethkey/src/extended.rs b/ethkey/src/extended.rs
index c8f057a4ba6..490014db9d8 100644
--- a/ethkey/src/extended.rs
+++ b/ethkey/src/extended.rs
@@ -18,7 +18,7 @@
 
 use secret::Secret;
 use Public;
-use bigint::hash::{H256, FixedHash};
+use bigint::hash::H256;
 pub use self::derivation::Error as DerivationError;
 
 /// Represents label that can be stored as a part of key derivation
@@ -212,7 +212,7 @@ mod derivation {
 	use rcrypto::hmac::Hmac;
 	use rcrypto::mac::Mac;
 	use rcrypto::sha2::Sha512;
-	use bigint::hash::{H512, H256, FixedHash};
+	use bigint::hash::{H512, H256};
 	use bigint::prelude::{U256, U512, Uint};
 	use secp256k1;
 	use secp256k1::key::{SecretKey, PublicKey};
diff --git a/ethkey/src/signature.rs b/ethkey/src/signature.rs
index 63f6854e293..34722228714 100644
--- a/ethkey/src/signature.rs
+++ b/ethkey/src/signature.rs
@@ -22,7 +22,7 @@ use std::hash::{Hash, Hasher};
 use secp256k1::{Message as SecpMessage, RecoverableSignature, RecoveryId, Error as SecpError};
 use secp256k1::key::{SecretKey, PublicKey};
 use rustc_serialize::hex::{ToHex, FromHex};
-use bigint::hash::{H520, H256, FixedHash};
+use bigint::hash::{H520, H256};
 use {Secret, Public, SECP256K1, Error, Message, public_to_address, Address};
 
 #[repr(C)]
diff --git a/ethstore/src/dir/memory.rs b/ethstore/src/dir/memory.rs
index 87d12794eb9..955afc5b0e5 100644
--- a/ethstore/src/dir/memory.rs
+++ b/ethstore/src/dir/memory.rs
@@ -67,7 +67,7 @@ impl KeyDirectory for MemoryDirectory {
 	fn unique_repr(&self) -> Result<u64, Error> {
 		let mut val = 0u64;
 		let accounts = self.accounts.read();
-		for acc in accounts.keys() { val = val ^ ::util::FixedHash::low_u64(acc) }
+		for acc in accounts.keys() { val = val ^ acc.low_u64() }
 		Ok(val)
 	}
 }
diff --git a/evmbin/src/ext.rs b/evmbin/src/ext.rs
index bcce9adc142..a293ccc8047 100644
--- a/evmbin/src/ext.rs
+++ b/evmbin/src/ext.rs
@@ -18,7 +18,7 @@
 
 use std::sync::Arc;
 use std::collections::HashMap;
-use util::{U256, H256, Address, Bytes, FixedHash, trie};
+use util::{U256, H256, Address, Bytes, trie};
 use ethcore::client::EnvInfo;
 use ethcore::evm::{self, Ext, ContractCreateResult, MessageCallResult, Schedule, CallType};
 
diff --git a/hw/src/ledger.rs b/hw/src/ledger.rs
index 255fa851546..fca1d0c3af6 100644
--- a/hw/src/ledger.rs
+++ b/hw/src/ledger.rs
@@ -24,7 +24,7 @@ use std::str::FromStr;
 use std::time::Duration;
 use super::WalletInfo;
 use ethkey::{Address, Signature};
-use ethcore_bigint::hash::{H256, FixedHash};
+use ethcore_bigint::hash::H256;
 
 const LEDGER_VID: u16 = 0x2c97;
 const LEDGER_PIDS: [u16; 2] = [0x0000, 0x0001]; // Nano S and Blue
@@ -260,12 +260,12 @@ impl Manager {
 				{
 					let mut chunk = &mut hid_chunk[HID_PREFIX_ZERO..];
 					&mut chunk[0..5].copy_from_slice(&[0x01, 0x01, APDU_TAG, (chunk_index >> 8) as u8, (chunk_index & 0xff) as u8 ]);
-				
+
 					if chunk_index == 0 {
 						let data_len = data.len() + 5;
 						&mut chunk[5..12].copy_from_slice(&[ (data_len >> 8) as u8, (data_len & 0xff) as u8, APDU_CLA, command, p1, p2, data.len() as u8 ]);
 					}
-				
+
 					&mut chunk[chunk_size..chunk_size + size].copy_from_slice(&data[offset..offset + size]);
 					offset += size;
 					chunk_size += size;
diff --git a/ipc-common-types/src/types/version_info.rs b/ipc-common-types/src/types/version_info.rs
index e36e40aefff..1f0e5845209 100644
--- a/ipc-common-types/src/types/version_info.rs
+++ b/ipc-common-types/src/types/version_info.rs
@@ -19,7 +19,7 @@
 use std::fmt;
 use std::str::FromStr;
 use semver::{Version};
-use util::{H160, FixedHash};
+use util::H160;
 use util::misc::raw_package_info;
 use release_track::ReleaseTrack;
 
diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index 8da7063f4b3..341ab13d8a7 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -23,7 +23,7 @@ use std::sync::{Arc, Weak};
 use futures::{self, future, BoxFuture, Future};
 use rlp::{self, UntrustedRlp, View};
 use time::get_time;
-use util::{H160, H256, Address, FixedHash, U256, H64, Uint};
+use util::{H160, H256, Address, U256, H64, Uint};
 use util::sha3::Hashable;
 use util::Mutex;
 
diff --git a/rpc/src/v1/impls/light/eth.rs b/rpc/src/v1/impls/light/eth.rs
index 9b0c92e9cc0..1c3d8fffd56 100644
--- a/rpc/src/v1/impls/light/eth.rs
+++ b/rpc/src/v1/impls/light/eth.rs
@@ -38,7 +38,7 @@ use ethcore::transaction::{Action, SignedTransaction, Transaction as EthTransact
 use ethsync::LightSync;
 use rlp::{UntrustedRlp, View};
 use util::sha3::{SHA3_NULL_RLP, SHA3_EMPTY_LIST_RLP};
-use util::{RwLock, Mutex, FixedHash, Uint, U256};
+use util::{RwLock, Mutex, Uint, U256};
 
 use futures::{future, Future, BoxFuture, IntoFuture};
 use futures::sync::oneshot;
diff --git a/rpc/src/v1/tests/helpers/miner_service.rs b/rpc/src/v1/tests/helpers/miner_service.rs
index c667e408bc6..f84431e6e9f 100644
--- a/rpc/src/v1/tests/helpers/miner_service.rs
+++ b/rpc/src/v1/tests/helpers/miner_service.rs
@@ -17,7 +17,7 @@
 //! Test implementation of miner service.
 
 use std::collections::hash_map::Entry;
-use util::{Address, H256, Bytes, U256, FixedHash, Uint};
+use util::{Address, H256, Bytes, U256, Uint};
 use util::standard::*;
 use ethcore::error::{Error, CallError};
 use ethcore::client::{MiningBlockChainClient, Executed, CallAnalytics};
diff --git a/rpc/src/v1/tests/mocked/eth.rs b/rpc/src/v1/tests/mocked/eth.rs
index 6603bd7220b..146444c21f9 100644
--- a/rpc/src/v1/tests/mocked/eth.rs
+++ b/rpc/src/v1/tests/mocked/eth.rs
@@ -22,7 +22,7 @@ use rustc_serialize::hex::{FromHex, ToHex};
 use time::get_time;
 use rlp;
 
-use util::{Uint, U256, Address, H256, FixedHash, Mutex};
+use util::{Uint, U256, Address, H256, Mutex};
 use ethkey::Secret;
 use ethcore::account_provider::AccountProvider;
 use ethcore::client::{TestBlockChainClient, EachBlockWith, Executed, TransactionId};
diff --git a/rpc/src/v1/tests/mocked/signing.rs b/rpc/src/v1/tests/mocked/signing.rs
index 10611f13913..e5b068b52d3 100644
--- a/rpc/src/v1/tests/mocked/signing.rs
+++ b/rpc/src/v1/tests/mocked/signing.rs
@@ -28,7 +28,7 @@ use v1::types::ConfirmationResponse;
 use v1::tests::helpers::TestMinerService;
 use v1::tests::mocked::parity;
 
-use util::{Address, FixedHash, Uint, U256, ToPretty};
+use util::{Address, Uint, U256, ToPretty};
 use ethkey::Secret;
 use ethcore::account_provider::AccountProvider;
 use ethcore::client::TestBlockChainClient;
diff --git a/scripts/contractABI.js b/scripts/contractABI.js
index 4db0fe3a199..98081123a26 100644
--- a/scripts/contractABI.js
+++ b/scripts/contractABI.js
@@ -32,7 +32,7 @@ use std::string::String;
 use std::result::Result;
 use std::fmt;
 use {util, ethabi};
-use util::{FixedHash, Uint};
+use util::Uint;
 
 ${convertContract(name, json, prefs)}
 `;
diff --git a/sync/src/chain.rs b/sync/src/chain.rs
index ef35f064007..2212876d1b3 100644
--- a/sync/src/chain.rs
+++ b/sync/src/chain.rs
@@ -2175,7 +2175,7 @@ mod tests {
 	use tests::snapshot::TestSnapshotService;
 	use util::{Uint, U256, Address, RwLock};
 	use util::sha3::Hashable;
-	use util::hash::{H256, FixedHash};
+	use util::hash::H256;
 	use util::bytes::Bytes;
 	use rlp::{Rlp, RlpStream, UntrustedRlp, View, Stream};
 	use super::*;
diff --git a/updater/src/operations.rs b/updater/src/operations.rs
index c67abcc75cc..71112d3e743 100644
--- a/updater/src/operations.rs
+++ b/updater/src/operations.rs
@@ -4,7 +4,7 @@ use std::string::String;
 use std::result::Result;
 use std::fmt;
 use ethabi;
-use util::{self, FixedHash, Uint};
+use util::{self, Uint};
 
 pub struct Operations {
 	contract: ethabi::Contract,
@@ -20,340 +20,340 @@ impl Operations {
 		}
 	}
 	fn as_string<T: fmt::Debug>(e: T) -> String { format!("{:?}", e) }
-	
+
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_newOwner","type":"address"}],"name":"resetClientOwner","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn reset_client_owner(&self, _client: &str, _new_owner: &util::Address) -> Result<(), String> { 
+	pub fn reset_client_owner(&self, _client: &str, _new_owner: &util::Address) -> Result<(), String> {
 		let call = self.contract.function("resetClientOwner".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::Address(_new_owner.clone().0)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_release","type":"bytes32"}],"name":"isLatest","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn is_latest(&self, _client: &str, _release: &util::H256) -> Result<bool, String> { 
+	pub fn is_latest(&self, _client: &str, _release: &util::H256) -> Result<bool, String> {
 		let call = self.contract.function("isLatest".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::FixedBytes(_release.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_txid","type":"bytes32"}],"name":"rejectTransaction","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn reject_transaction(&self, _txid: &util::H256) -> Result<(), String> { 
+	pub fn reject_transaction(&self, _txid: &util::H256) -> Result<(), String> {
 		let call = self.contract.function("rejectTransaction".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_txid.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn set_owner(&self, _new_owner: &util::Address) -> Result<(), String> { 
+	pub fn set_owner(&self, _new_owner: &util::Address) -> Result<(), String> {
 		let call = self.contract.function("setOwner".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::Address(_new_owner.clone().0)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_number","type":"uint32"},{"name":"_name","type":"bytes32"},{"name":"_hard","type":"bool"},{"name":"_spec","type":"bytes32"}],"name":"proposeFork","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn propose_fork(&self, _number: u32, _name: &util::H256, _hard: bool, _spec: &util::H256) -> Result<(), String> { 
+	pub fn propose_fork(&self, _number: u32, _name: &util::H256, _hard: bool, _spec: &util::H256) -> Result<(), String> {
 		let call = self.contract.function("proposeFork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_number as u64).to_big_endian(&mut r); r }), ethabi::Token::FixedBytes(_name.as_ref().to_owned()), ethabi::Token::Bool(_hard), ethabi::Token::FixedBytes(_spec.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_client","type":"bytes32"}],"name":"removeClient","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn remove_client(&self, _client: &str) -> Result<(), String> { 
+	pub fn remove_client(&self, _client: &str) -> Result<(), String> {
 		let call = self.contract.function("removeClient".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned())]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_release","type":"bytes32"}],"name":"release","outputs":[{"name":"o_forkBlock","type":"uint32"},{"name":"o_track","type":"uint8"},{"name":"o_semver","type":"uint24"},{"name":"o_critical","type":"bool"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn release(&self, _client: &str, _release: &util::H256) -> Result<(u32, u8, u32, bool), String> { 
+	pub fn release(&self, _client: &str, _release: &util::H256) -> Result<(u32, u8, u32, bool), String> {
 		let call = self.contract.function("release".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::FixedBytes(_release.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u8 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u8 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_checksum","type":"bytes32"}],"name":"build","outputs":[{"name":"o_release","type":"bytes32"},{"name":"o_platform","type":"bytes32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn build(&self, _client: &str, _checksum: &util::H256) -> Result<(util::H256, util::H256), String> { 
+	pub fn build(&self, _client: &str, _checksum: &util::H256) -> Result<(util::H256, util::H256), String> {
 		let call = self.contract.function("build".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::FixedBytes(_checksum.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[],"name":"rejectFork","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn reject_fork(&self) -> Result<(), String> { 
+	pub fn reject_fork(&self) -> Result<(), String> {
 		let call = self.contract.function("rejectFork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"client","outputs":[{"name":"owner","type":"address"},{"name":"required","type":"bool"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn client(&self, _1: &util::H256) -> Result<(util::Address, bool), String> { 
+	pub fn client(&self, _1: &util::H256) -> Result<(util::Address, bool), String> {
 		let call = self.contract.function("client".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_1.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"setClientOwner","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn set_client_owner(&self, _new_owner: &util::Address) -> Result<(), String> { 
+	pub fn set_client_owner(&self, _new_owner: &util::Address) -> Result<(), String> {
 		let call = self.contract.function("setClientOwner".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::Address(_new_owner.clone().0)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"","type":"uint32"}],"name":"fork","outputs":[{"name":"name","type":"bytes32"},{"name":"spec","type":"bytes32"},{"name":"hard","type":"bool"},{"name":"ratified","type":"bool"},{"name":"requiredCount","type":"uint256"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn fork(&self, _1: u32) -> Result<(util::H256, util::H256, bool, bool, util::U256), String> { 
+	pub fn fork(&self, _1: u32) -> Result<(util::H256, util::H256, bool, bool, util::U256), String> {
 		let call = self.contract.function("fork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_1 as u64).to_big_endian(&mut r); r })]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bool().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_release","type":"bytes32"},{"name":"_platform","type":"bytes32"},{"name":"_checksum","type":"bytes32"}],"name":"addChecksum","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn add_checksum(&self, _release: &util::H256, _platform: &str, _checksum: &util::H256) -> Result<(), String> { 
+	pub fn add_checksum(&self, _release: &util::H256, _platform: &str, _checksum: &util::H256) -> Result<(), String> {
 		let call = self.contract.function("addChecksum".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_release.as_ref().to_owned()), ethabi::Token::FixedBytes(_platform.as_bytes().to_owned()), ethabi::Token::FixedBytes(_checksum.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_txid","type":"bytes32"}],"name":"confirmTransaction","outputs":[{"name":"txSuccess","type":"uint256"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn confirm_transaction(&self, _txid: &util::H256) -> Result<util::U256, String> { 
+	pub fn confirm_transaction(&self, _txid: &util::H256) -> Result<util::U256, String> {
 		let call = self.contract.function("confirmTransaction".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_txid.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"proxy","outputs":[{"name":"requiredCount","type":"uint256"},{"name":"to","type":"address"},{"name":"data","type":"bytes"},{"name":"value","type":"uint256"},{"name":"gas","type":"uint256"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn proxy(&self, _1: &util::H256) -> Result<(util::U256, util::Address, Vec<u8>, util::U256, util::U256), String> { 
+	pub fn proxy(&self, _1: &util::H256) -> Result<(util::U256, util::Address, Vec<u8>, util::U256, util::U256), String> {
 		let call = self.contract.function("proxy".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_1.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bytes().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_bytes().ok_or("Invalid type returned")?; r }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }, { let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_owner","type":"address"}],"name":"addClient","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn add_client(&self, _client: &str, _owner: &util::Address) -> Result<(), String> { 
+	pub fn add_client(&self, _client: &str, _owner: &util::Address) -> Result<(), String> {
 		let call = self.contract.function("addClient".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::Address(_owner.clone().0)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"clientOwner","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn client_owner(&self, _1: &util::Address) -> Result<util::H256, String> { 
+	pub fn client_owner(&self, _1: &util::Address) -> Result<util::H256, String> {
 		let call = self.contract.function("clientOwner".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::Address(_1.clone().0)]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_txid","type":"bytes32"},{"name":"_to","type":"address"},{"name":"_data","type":"bytes"},{"name":"_value","type":"uint256"},{"name":"_gas","type":"uint256"}],"name":"proposeTransaction","outputs":[{"name":"txSuccess","type":"uint256"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn propose_transaction(&self, _txid: &util::H256, _to: &util::Address, _data: &[u8], _value: util::U256, _gas: util::U256) -> Result<util::U256, String> { 
+	pub fn propose_transaction(&self, _txid: &util::H256, _to: &util::Address, _data: &[u8], _value: util::U256, _gas: util::U256) -> Result<util::U256, String> {
 		let call = self.contract.function("proposeTransaction".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_txid.as_ref().to_owned()), ethabi::Token::Address(_to.clone().0), ethabi::Token::Bytes(_data.to_owned()), ethabi::Token::Uint({ let mut r = [0u8; 32]; _value.to_big_endian(&mut r); r }), ethabi::Token::Uint({ let mut r = [0u8; 32]; _gas.to_big_endian(&mut r); r })]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[],"name":"grandOwner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn grand_owner(&self) -> Result<util::Address, String> { 
+	pub fn grand_owner(&self) -> Result<util::Address, String> {
 		let call = self.contract.function("grandOwner".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_address().ok_or("Invalid type returned")?; util::Address::from(r) }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_release","type":"bytes32"},{"name":"_forkBlock","type":"uint32"},{"name":"_track","type":"uint8"},{"name":"_semver","type":"uint24"},{"name":"_critical","type":"bool"}],"name":"addRelease","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn add_release(&self, _release: &util::H256, _fork_block: u32, _track: u8, _semver: u32, _critical: bool) -> Result<(), String> { 
+	pub fn add_release(&self, _release: &util::H256, _fork_block: u32, _track: u8, _semver: u32, _critical: bool) -> Result<(), String> {
 		let call = self.contract.function("addRelease".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_release.as_ref().to_owned()), ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_fork_block as u64).to_big_endian(&mut r); r }), ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_track as u64).to_big_endian(&mut r); r }), ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_semver as u64).to_big_endian(&mut r); r }), ethabi::Token::Bool(_critical)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[],"name":"acceptFork","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn accept_fork(&self) -> Result<(), String> { 
+	pub fn accept_fork(&self) -> Result<(), String> {
 		let call = self.contract.function("acceptFork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[],"name":"clientsRequired","outputs":[{"name":"","type":"uint32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn clients_required(&self) -> Result<u32, String> { 
+	pub fn clients_required(&self) -> Result<u32, String> {
 		let call = self.contract.function("clientsRequired".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_release","type":"bytes32"}],"name":"track","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn track(&self, _client: &str, _release: &util::H256) -> Result<u8, String> { 
+	pub fn track(&self, _client: &str, _release: &util::H256) -> Result<u8, String> {
 		let call = self.contract.function("track".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::FixedBytes(_release.as_ref().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u8 })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u8 }))
 	}
 
 	/// Auto-generated from: `{"constant":false,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_r","type":"bool"}],"name":"setClientRequired","outputs":[],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn set_client_required(&self, _client: &str, _r: bool) -> Result<(), String> { 
+	pub fn set_client_required(&self, _client: &str, _r: bool) -> Result<(), String> {
 		let call = self.contract.function("setClientRequired".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::Bool(_r)]
 		).map_err(Self::as_string)?;
 		call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
-		
-		Ok(()) 
+
+		Ok(())
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[],"name":"latestFork","outputs":[{"name":"","type":"uint32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn latest_fork(&self) -> Result<u32, String> { 
+	pub fn latest_fork(&self) -> Result<u32, String> {
 		let call = self.contract.function("latestFork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_track","type":"uint8"}],"name":"latestInTrack","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn latest_in_track(&self, _client: &str, _track: u8) -> Result<util::H256, String> { 
+	pub fn latest_in_track(&self, _client: &str, _track: u8) -> Result<util::H256, String> {
 		let call = self.contract.function("latestInTrack".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::Uint({ let mut r = [0u8; 32]; util::U256::from(_track as u64).to_big_endian(&mut r); r })]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[{"name":"_client","type":"bytes32"},{"name":"_release","type":"bytes32"},{"name":"_platform","type":"bytes32"}],"name":"checksum","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn checksum(&self, _client: &str, _release: &util::H256, _platform: &str) -> Result<util::H256, String> { 
+	pub fn checksum(&self, _client: &str, _release: &util::H256, _platform: &str) -> Result<util::H256, String> {
 		let call = self.contract.function("checksum".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![ethabi::Token::FixedBytes(_client.as_bytes().to_owned()), ethabi::Token::FixedBytes(_release.as_ref().to_owned()), ethabi::Token::FixedBytes(_platform.as_bytes().to_owned())]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_fixed_bytes().ok_or("Invalid type returned")?; util::H256::from_slice(r.as_ref()) }))
 	}
 
 	/// Auto-generated from: `{"constant":true,"inputs":[],"name":"proposedFork","outputs":[{"name":"","type":"uint32"}],"payable":false,"type":"function"}`
 	#[allow(dead_code)]
-	pub fn proposed_fork(&self) -> Result<u32, String> { 
+	pub fn proposed_fork(&self) -> Result<u32, String> {
 		let call = self.contract.function("proposedFork".into()).map_err(Self::as_string)?;
 		let data = call.encode_call(
 			vec![]
 		).map_err(Self::as_string)?;
 		let output = call.decode_output((self.do_call)(self.address.clone(), data)?).map_err(Self::as_string)?;
 		let mut result = output.into_iter().rev().collect::<Vec<_>>();
-		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 })) 
+		Ok(({ let r = result.pop().ok_or("Invalid return arity")?; let r = r.to_uint().ok_or("Invalid type returned")?; util::U256::from(r.as_ref()).as_u64() as u32 }))
 	}
-}
\ No newline at end of file
+}
diff --git a/updater/src/updater.rs b/updater/src/updater.rs
index a6c374e10ed..c2bc98273e8 100644
--- a/updater/src/updater.rs
+++ b/updater/src/updater.rs
@@ -22,7 +22,7 @@ use target_info::Target;
 use util::misc;
 use ipc_common_types::{VersionInfo, ReleaseTrack};
 use util::path::restrict_permissions_owner;
-use util::{Address, H160, H256, FixedHash, Mutex, Bytes};
+use util::{Address, H160, H256, Mutex, Bytes};
 use ethsync::{SyncProvider};
 use ethcore::client::{BlockId, BlockChainClient, ChainNotify};
 use hash_fetch::{self as fetch, HashFetch};
diff --git a/util/bigint/src/hash.rs b/util/bigint/src/hash.rs
index cf74ea0cbe8..51407033bdc 100644
--- a/util/bigint/src/hash.rs
+++ b/util/bigint/src/hash.rs
@@ -28,32 +28,6 @@ use rustc_serialize::hex::{FromHex, FromHexError};
 use bigint::{Uint, U256};
 use libc::{c_void, memcmp};
 
-/// Trait for a fixed-size byte array to be used as the output of hash functions.
-pub trait FixedHash: Sized {
-	/// Create a new, zero-initialised, instance.
-	fn new() -> Self;
-	/// Synonym for `new()`. Prefer to new as it's more readable.
-	fn zero() -> Self;
-	/// Create a new, cryptographically random, instance.
-	fn random() -> Self;
-	/// Assign self have a cryptographically random value.
-	fn randomize(&mut self);
-	/// Get the size of this object in bytes.
-	fn len() -> usize;
-	/// Convert a slice of bytes of length `len()` to an instance of this type.
-	fn from_slice(src: &[u8]) -> Self;
-	/// Assign self to be of the same value as a slice of bytes of length `len()`.
-	fn clone_from_slice(&mut self, src: &[u8]) -> usize;
-	/// Copy the data of this object into some mutable slice of length `len()`.
-	fn copy_to(&self, dest: &mut [u8]);
-	/// Returns `true` if all bits set in `b` are also set in `self`.
-	fn contains<'a>(&'a self, b: &'a Self) -> bool;
-	/// Returns `true` if no bits are set.
-	fn is_zero(&self) -> bool;
-	/// Returns the lowest 8 bytes interpreted as a BigEndian integer.
-	fn low_u64(&self) -> u64;
-}
-
 /// Return `s` without the `0x` at the beginning of it, if any.
 pub fn clean_0x(s: &str) -> &str {
 	if s.starts_with("0x") {
@@ -105,57 +79,68 @@ macro_rules! impl_hash {
 			}
 		}
 
-		impl FixedHash for $from {
-			fn new() -> $from {
+		impl $from {
+			/// Create a new, zero-initialised, instance.
+			pub fn new() -> $from {
 				$from([0; $size])
 			}
 
-			fn zero() -> $from {
+			/// Synonym for `new()`. Prefer to new as it's more readable.
+			pub fn zero() -> $from {
 				$from([0; $size])
 			}
 
-			fn random() -> $from {
+			/// Create a new, cryptographically random, instance.
+			pub fn random() -> $from {
 				let mut hash = $from::new();
 				hash.randomize();
 				hash
 			}
 
-			fn randomize(&mut self) {
+			/// Assign self have a cryptographically random value.
+			pub fn randomize(&mut self) {
 				let mut rng = OsRng::new().unwrap();
 				rng.fill_bytes(&mut self.0);
 			}
 
-			fn len() -> usize {
+			/// Get the size of this object in bytes.
+			pub fn len() -> usize {
 				$size
 			}
 
 			#[inline]
-			fn clone_from_slice(&mut self, src: &[u8]) -> usize {
+			/// Assign self to be of the same value as a slice of bytes of length `len()`.
+			pub fn clone_from_slice(&mut self, src: &[u8]) -> usize {
 				let min = cmp::min($size, src.len());
 				self.0[..min].copy_from_slice(&src[..min]);
 				min
 			}
 
-			fn from_slice(src: &[u8]) -> Self {
+			/// Convert a slice of bytes of length `len()` to an instance of this type.
+			pub fn from_slice(src: &[u8]) -> Self {
 				let mut r = Self::new();
 				r.clone_from_slice(src);
 				r
 			}
 
-			fn copy_to(&self, dest: &mut[u8]) {
+			/// Copy the data of this object into some mutable slice of length `len()`.
+			pub fn copy_to(&self, dest: &mut[u8]) {
 				let min = cmp::min($size, dest.len());
 				dest[..min].copy_from_slice(&self.0[..min]);
 			}
 
-			fn contains<'a>(&'a self, b: &'a Self) -> bool {
+			/// Returns `true` if all bits set in `b` are also set in `self`.
+			pub fn contains<'a>(&'a self, b: &'a Self) -> bool {
 				&(b & self) == b
 			}
 
-			fn is_zero(&self) -> bool {
+			/// Returns `true` if no bits are set.
+			pub fn is_zero(&self) -> bool {
 				self.eq(&Self::new())
 			}
 
-			fn low_u64(&self) -> u64 {
+			/// Returns the lowest 8 bytes interpreted as a BigEndian integer.
+			pub fn low_u64(&self) -> u64 {
 				let mut ret = 0u64;
 				for i in 0..min($size, 8) {
 					ret |= (self.0[$size - 1 - i] as u64) << (i * 8);
diff --git a/util/network/src/discovery.rs b/util/network/src/discovery.rs
index 04ad0b7ce42..f3a8aa523ac 100644
--- a/util/network/src/discovery.rs
+++ b/util/network/src/discovery.rs
@@ -556,7 +556,6 @@ impl Discovery {
 mod tests {
 	use super::*;
 	use std::net::{SocketAddr};
-	use util::FixedHash;
 	use node_table::{Node, NodeId, NodeEndpoint};
 
 	use std::str::FromStr;
diff --git a/util/network/src/handshake.rs b/util/network/src/handshake.rs
index 6ae775f97ce..9f6474c39de 100644
--- a/util/network/src/handshake.rs
+++ b/util/network/src/handshake.rs
@@ -333,7 +333,7 @@ mod test {
 	use std::sync::Arc;
 	use rustc_serialize::hex::FromHex;
 	use super::*;
-	use util::hash::{H256, FixedHash};
+	use util::hash::H256;
 	use io::*;
 	use mio::tcp::TcpStream;
 	use stats::NetworkStats;
diff --git a/util/src/bloom.rs b/util/src/bloom.rs
index a54e8073c0b..c39921f5d55 100644
--- a/util/src/bloom.rs
+++ b/util/src/bloom.rs
@@ -18,7 +18,7 @@
 
 use std::mem;
 use std::ops::DerefMut;
-use {H64, H160, H256, H512, H520, H2048, FixedHash};
+use {H64, H160, H256, H512, H520, H2048};
 
 /// Returns log2.
 pub fn log2(x: usize) -> u32 {
diff --git a/util/src/sha3.rs b/util/src/sha3.rs
index 45d6a34d500..8adcfbfeec9 100644
--- a/util/src/sha3.rs
+++ b/util/src/sha3.rs
@@ -19,7 +19,7 @@ extern crate sha3 as sha3_ext;
 
 use std::io;
 use tiny_keccak::Keccak;
-use hash::{H256, FixedHash};
+use hash::H256;
 use self::sha3_ext::*;
 
 /// Get the SHA3 (i.e. Keccak) hash of the empty bytes string.