diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 773703f417..9a008f2e71 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -218,6 +218,15 @@ dependencies = [
  "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.3.3"
@@ -531,6 +540,15 @@ name = "crunchy"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crypto-mac"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crypto-mac"
 version = "0.6.2"
@@ -616,6 +634,14 @@ name = "difference"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "digest"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "digest"
 version = "0.7.6"
@@ -832,6 +858,15 @@ name = "gcc"
 version = "0.3.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "generic-array"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.9.0"
@@ -933,6 +968,16 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hmac"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hmac"
 version = "0.6.3"
@@ -942,6 +987,16 @@ dependencies = [
  "digest 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hmac-drbg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "http"
 version = "0.1.15"
@@ -1545,6 +1600,19 @@ dependencies = [
  "make-cmd 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "libsecp256k1"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "linked-hash-map"
 version = "0.4.2"
@@ -2637,6 +2705,18 @@ name = "sha1"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sha2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha2"
 version = "0.7.1"
@@ -2739,12 +2819,14 @@ version = "0.1.0"
 dependencies = [
  "environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3501,6 +3583,7 @@ dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3512,6 +3595,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wabt 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmi 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -4669,6 +4753,7 @@ dependencies = [
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum blake2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "91721a6330935673395a0607df4d49a9cb90ae12d259f1b3e0a3f6e1d486872e"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
+"checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
 "checksum block-buffer 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a076c298b9ecdb530ed9d967e74a6027d6a7478924520acddcddc24c1c8ab3ab"
 "checksum block-buffer 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "49665c62e0e700857531fa5d3763e91b539ff1abeebd56808d378b495870d60d"
 "checksum block-cipher-trait 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "370424437b9459f3dfd68428ed9376ddfe03d8b70ede29cc533b3557df186ab4"
@@ -4705,6 +4790,7 @@ dependencies = [
 "checksum crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "41ee4864f4797060e52044376f7d107429ce1fb43460021b126424b7180ee21a"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
 "checksum crunchy 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c240f247c278fa08a6d4820a6a222bfc6e0d999e51ba67be94f44c905b2161f2"
+"checksum crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "779015233ac67d65098614aec748ac1c756ab6677fa2e14cf8b37c08dfed1198"
 "checksum crypto-mac 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7afa06d05a046c7a47c3a849907ec303504608c927f4e85f7bfff22b7180d971"
 "checksum crypto-mac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
 "checksum csv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "9fd1c44c58078cfbeaf11fbb3eac9ae5534c23004ed770cc4bfb48e658ae4f04"
@@ -4715,6 +4801,7 @@ dependencies = [
 "checksum curve25519-dalek 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3eacf6ff1b911e3170a8c400b402e10c86dc3cb166bd69034ebbc2b785fea4c2"
 "checksum data-encoding 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4f47ca1860a761136924ddd2422ba77b2ea54fe8cc75b9040804a0d9d32ad97"
 "checksum difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+"checksum digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e5b29bf156f3f4b3c4f610a25ff69370616ae6e0657d416de22645483e72af0a"
 "checksum digest 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "03b072242a8cbaf9c145665af9d250c59af3b958f83ed6824e13533cf76d5b90"
 "checksum digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05f47366984d3ad862010e22c7ce81a7dbcaebbdfb37241a620f8b6596ee135c"
 "checksum discard 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "212d0f5754cb6769937f4501cc0e67f4f4483c8d2c3e1e922ee9edbe4ab4c7c0"
@@ -4743,6 +4830,7 @@ dependencies = [
 "checksum futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"
 "checksum gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)" = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
 "checksum generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c0f28c2f5bfb5960175af447a2da7c18900693738343dc896ffbcabd9839592"
+"checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum generic-array 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef25c5683767570c2bbd7deba372926a55eaae9982d7726ee2a1050239d45b9d"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum globset 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4743617a7464bbda3c8aec8558ff2f9429047e025771037df561d383337ff865"
@@ -4754,7 +4842,9 @@ dependencies = [
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 "checksum hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4da5f0e01bd8a71a224a4eedecaacfcabda388dbb7a80faf04d3514287572d95"
 "checksum hex-literal-impl 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1d340b6514f232f6db1bd16db65302a5278a04fef9ce867cb932e7e5fa21130a"
+"checksum hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7a13f4163aa0c5ca1be584aace0e2212b2e41be5478218d4f657f5f778b2ae2a"
 "checksum hmac 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "733e1b3ac906631ca01ebb577e9bb0f5e37a454032b9036b5eaea4013ed6f99a"
+"checksum hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4fe727d41d2eec0a6574d887914347e5ff96a3b87177817e2a9820c5c87fecc2"
 "checksum http 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "1a10e5b573b9a0146545010f50772b9e8b1dd0a256564cc4307694c68832a2f5"
 "checksum httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8734b0cfd3bc3e101ec59100e101c2eecd19282202e87808b3037b442777a83"
 "checksum humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3ca7e5f2e110db35f93b837c81797f3714500b81d517bf20c431b16d3ca4f114"
@@ -4803,6 +4893,7 @@ dependencies = [
 "checksum libp2p-websocket 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "80b60b65b8d7053220a0c78a09eda0a162db410067639d2b24432a9f1dc06230"
 "checksum libp2p-yamux 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "71b4fd69a1c038152d017366d759177e2580fb4fbb56ce65429a642e011a07b1"
 "checksum librocksdb-sys 5.14.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b9024327233e7fac7982440f73301c00046d438c5b1011e8f4e394226ce19007"
+"checksum libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "688e8d65e495567c2c35ea0001b26b9debf0b4ea11f8cccc954233b75fc3428a"
 "checksum linked-hash-map 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7860ec297f7008ff7a1e3382d7f7e1dcd69efc94751a2284bafc3d013c2aa939"
 "checksum linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "70fb39025bc7cdd76305867c4eccf2f2dcf6e9a57f5b21a93e1c2d86cd03ec9e"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
@@ -4919,6 +5010,7 @@ dependencies = [
 "checksum serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)" = "a915306b0f1ac5607797697148c223bedeaa36bcc2e28a01441cd638cc6567b4"
 "checksum serde_json 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)" = "4b90a9fbe1211e57d3e1c15670f1cb00802988fb23a1a4aad7a2b63544f1920e"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
+"checksum sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d963c78ce367df26d7ea8b8cc655c651b42e8a1e584e869c1e17dae3ccb116a"
 "checksum sha2 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9eb6be24e4c23a84d7184280d2722f7f2731fcdd4a9d886efbfe4413e4847ea0"
 "checksum sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b4d8bfd0e469f417657573d8451fb33d16cfe0989359b93baf3a1ffc639543d"
 "checksum shell32-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9ee04b46101f57121c9da2b151988283b6beb79b34f5bb29a58ee48cb695122c"
diff --git a/substrate/core/executor/Cargo.toml b/substrate/core/executor/Cargo.toml
index b40dd06fa3..705bbf6706 100644
--- a/substrate/core/executor/Cargo.toml
+++ b/substrate/core/executor/Cargo.toml
@@ -20,6 +20,8 @@ lazy_static = "1.0"
 parking_lot = "0.7.1"
 log = "0.4"
 fnv = "1.0.6"
+libsecp256k1 = "0.2.1"
+tiny-keccak = "1.4.2"
 
 [dev-dependencies]
 assert_matches = "1.1"
diff --git a/substrate/core/executor/src/lib.rs b/substrate/core/executor/src/lib.rs
index 8ce1c775fb..ddc9828916 100644
--- a/substrate/core/executor/src/lib.rs
+++ b/substrate/core/executor/src/lib.rs
@@ -28,6 +28,8 @@
 #![warn(missing_docs)]
 #![recursion_limit="128"]
 
+extern crate tiny_keccak;
+extern crate secp256k1;
 extern crate parity_codec as codec;
 extern crate sr_io as runtime_io;
 #[cfg_attr(test, macro_use)]
diff --git a/substrate/core/executor/src/wasm_executor.rs b/substrate/core/executor/src/wasm_executor.rs
index 87704805c1..7776c83f61 100644
--- a/substrate/core/executor/src/wasm_executor.rs
+++ b/substrate/core/executor/src/wasm_executor.rs
@@ -17,6 +17,8 @@
 //! Rust implementation of Substrate contracts.
 
 use std::collections::HashMap;
+use tiny_keccak;
+use secp256k1;
 
 use wasmi::{
 	Module, ModuleInstance, MemoryInstance, MemoryRef, TableRef, ImportsBuilder, ModuleRef,
@@ -420,7 +422,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(this.ext.chain_id())
 	},
 	ext_twox_128(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 16] = if len == 0 {
 			let hashed = twox_128(&[0u8; 0]);
 			debug_trace!(target: "xxhash", "XXhash: '' -> {}", HexDisplay::from(&hashed));
 			this.hash_lookup.insert(hashed.to_vec(), vec![]);
@@ -444,7 +446,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(())
 	},
 	ext_twox_256(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 32] = if len == 0 {
 			twox_256(&[0u8; 0])
 		} else {
 			twox_256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_twox_256"))?)
@@ -453,7 +455,7 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		Ok(())
 	},
 	ext_blake2_256(data: *const u8, len: u32, out: *mut u8) => {
-		let result = if len == 0 {
+		let result: [u8; 32] = if len == 0 {
 			blake2_256(&[0u8; 0])
 		} else {
 			blake2_256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_blake2_256"))?)
@@ -461,6 +463,15 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 		this.memory.set(out, &result).map_err(|_| UserError("Invalid attempt to set result in ext_blake2_256"))?;
 		Ok(())
 	},
+	ext_keccak_256(data: *const u8, len: u32, out: *mut u8) => {
+		let result: [u8; 32] = if len == 0 {
+			tiny_keccak::keccak256(&[0u8; 0])
+		} else {
+			tiny_keccak::keccak256(&this.memory.get(data, len as usize).map_err(|_| UserError("Invalid attempt to get data in ext_keccak_256"))?)
+		};
+		this.memory.set(out, &result).map_err(|_| UserError("Invalid attempt to set result in ext_keccak_256"))?;
+		Ok(())
+	},
 	ext_ed25519_verify(msg_data: *const u8, msg_len: u32, sig_data: *const u8, pubkey_data: *const u8) -> u32 => {
 		let mut sig = [0u8; 64];
 		this.memory.get_into(sig_data, &mut sig[..]).map_err(|_| UserError("Invalid attempt to get signature in ext_ed25519_verify"))?;
@@ -474,6 +485,31 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
 			5
 		})
 	},
+	ext_secp256k1_ecdsa_recover(msg_data: *const u8, sig_data: *const u8, pubkey_data: *mut u8) -> u32 => {
+		let mut sig = [0u8; 65];
+		this.memory.get_into(sig_data, &mut sig[..]).map_err(|_| UserError("Invalid attempt to get signature in ext_secp256k1_ecdsa_recover"))?;
+		let rs = match secp256k1::Signature::parse_slice(&sig[0..64]) {
+			Ok(rs) => rs,
+			_ => return Ok(1),
+		};
+		let v = match secp256k1::RecoveryId::parse(if sig[64] > 26 { sig[64] - 27 } else { sig[64] } as u8) {
+			Ok(v) => v,
+			_ => return Ok(2),
+		};
+
+
+		let mut msg = [0u8; 32];
+		this.memory.get_into(msg_data, &mut msg[..]).map_err(|_| UserError("Invalid attempt to get message in ext_secp256k1_ecdsa_recover"))?;
+
+		let pubkey = match secp256k1::recover(&secp256k1::Message::parse(&msg), &rs, &v) {
+			Ok(pk) => pk,
+			_ => return Ok(3),
+		};
+
+		this.memory.set(pubkey_data, &pubkey.serialize()[1..65]).map_err(|_| UserError("Invalid attempt to set pubkey in ext_secp256k1_ecdsa_recover"))?;
+
+		Ok(0)
+	},
 	ext_sandbox_instantiate(
 		dispatch_thunk_idx: usize,
 		wasm_ptr: *const u8,
diff --git a/substrate/core/sr-io/Cargo.toml b/substrate/core/sr-io/Cargo.toml
index cf07a1acd6..18fea94685 100644
--- a/substrate/core/sr-io/Cargo.toml
+++ b/substrate/core/sr-io/Cargo.toml
@@ -12,7 +12,8 @@ sr-std = { path = "../sr-std", default-features = false }
 substrate-primitives = { path = "../primitives", default-features = false }
 parity-codec = { version = "2.2", default-features = false }
 hash-db = { version = "0.9", default-features = false }
-
+libsecp256k1 = { version = "0.2.1", optional = true }
+tiny-keccak = { version = "1.4.2", optional = true }
 environmental = { version = "~1.0", optional = true }
 substrate-state-machine = { path = "../state-machine", optional = true }
 substrate-trie = { path = "../trie", optional = true }
@@ -27,7 +28,9 @@ std = [
 	"hash-db/std",
 	"environmental",
 	"substrate-state-machine",
-	"substrate-trie"
+	"substrate-trie",
+	"libsecp256k1",
+	"tiny-keccak"
 ]
 nightly = []
 strict = []
diff --git a/substrate/core/sr-io/src/lib.rs b/substrate/core/sr-io/src/lib.rs
index 3394265a84..aa446f74a5 100644
--- a/substrate/core/sr-io/src/lib.rs
+++ b/substrate/core/sr-io/src/lib.rs
@@ -25,6 +25,12 @@
 #![cfg_attr(feature = "std", doc = "Substrate runtime standard library as compiled when linked with Rust's standard library.")]
 #![cfg_attr(not(feature = "std"), doc = "Substrate's runtime standard library as compiled without Rust's standard library.")]
 
+pub enum EcdsaVerifyError {
+	BadRS,
+	BadV,
+	BadSignature,
+}
+
 #[cfg(feature = "std")]
 include!("../with_std.rs");
 
diff --git a/substrate/core/sr-io/with_std.rs b/substrate/core/sr-io/with_std.rs
index a608a632fe..c3ba363d28 100644
--- a/substrate/core/sr-io/with_std.rs
+++ b/substrate/core/sr-io/with_std.rs
@@ -24,10 +24,14 @@ extern crate substrate_state_machine;
 extern crate substrate_trie as trie;
 extern crate hash_db;
 
+extern crate tiny_keccak;
+extern crate secp256k1;
+
 #[doc(hidden)]
 pub extern crate parity_codec as codec;
 // re-export hashing functions.
 pub use primitives::{blake2_256, twox_128, twox_256, ed25519};
+pub use tiny_keccak::keccak256 as keccak_256;
 
 pub use primitives::{Blake2Hasher};
 // Switch to this after PoC-3
@@ -200,6 +204,18 @@ pub fn ed25519_verify<P: AsRef<[u8]>>(sig: &[u8; 64], msg: &[u8], pubkey: P) ->
 	ed25519::verify(sig, msg, pubkey)
 }
 
+/// Verify and recover a SECP256k1 ECDSA signature.
+/// - `sig` is passed in RSV format. V should be either 0/1 or 27/28.
+/// - returns `Err` if the signatue is bad, otherwise the 64-byte pubkey (doesn't include the 0x04 prefix).
+pub fn secp256k1_ecdsa_recover(sig: &[u8; 65], msg: &[u8; 32]) -> Result<[u8; 64], EcdsaVerifyError> {
+	let rs = secp256k1::Signature::parse_slice(&sig[0..64]).map_err(|_| EcdsaVerifyError::BadRS)?;
+	let v = secp256k1::RecoveryId::parse(if sig[64] > 26 { sig[64] - 27 } else { sig[64] } as u8).map_err(|_| EcdsaVerifyError::BadV)?;
+	let pubkey = secp256k1::recover(&secp256k1::Message::parse(msg), &rs, &v).map_err(|_| EcdsaVerifyError::BadSignature)?;
+	let mut res = [0u8; 64];
+	res.copy_from_slice(&pubkey.serialize()[1..65]);
+	Ok(res)
+}
+
 /// Execute the given closure with global function available whose functionality routes into the
 /// externalities `ext`. Forwards the value that the closure returns.
 // NOTE: need a concrete hasher here due to limitations of the `environmental!` macro, otherwise a type param would have been fine I think.
diff --git a/substrate/core/sr-io/without_std.rs b/substrate/core/sr-io/without_std.rs
index 229f971f28..f0ae5e7020 100644
--- a/substrate/core/sr-io/without_std.rs
+++ b/substrate/core/sr-io/without_std.rs
@@ -91,8 +91,11 @@ extern "C" {
 	fn ext_blake2_256(data: *const u8, len: u32, out: *mut u8);
 	fn ext_twox_128(data: *const u8, len: u32, out: *mut u8);
 	fn ext_twox_256(data: *const u8, len: u32, out: *mut u8);
+	fn ext_keccak_256(data: *const u8, len: u32, out: *mut u8);
 	/// Note: ext_ed25519_verify returns 0 if the signature is correct, nonzero otherwise.
 	fn ext_ed25519_verify(msg_data: *const u8, msg_len: u32, sig_data: *const u8, pubkey_data: *const u8) -> u32;
+	/// Note: ext_secp256k1_ecdsa_recover returns 0 if the signature is correct, nonzero otherwise.
+	fn ext_secp256k1_ecdsa_recover(msg_data: *const u8, sig_data: *const u8, pubkey_data: *mut u8) -> u32;
 }
 
 /// Ensures we use the right crypto when calling into native
@@ -343,6 +346,15 @@ pub fn blake2_256(data: &[u8]) -> [u8; 32] {
 	result
 }
 
+/// Conduct a 256-bit Keccak hash.
+pub fn keccak_256(data: &[u8]) -> [u8; 32] {
+	let mut result: [u8; 32] = Default::default();
+	unsafe {
+		ext_keccak_256(data.as_ptr(), data.len() as u32, result.as_mut_ptr());
+	}
+	result
+}
+
 /// Conduct four XX hashes to give a 256-bit result.
 pub fn twox_256(data: &[u8]) -> [u8; 32] {
 	let mut result: [u8; 32] = Default::default();
@@ -368,6 +380,22 @@ pub fn ed25519_verify<P: AsRef<[u8]>>(sig: &[u8; 64], msg: &[u8], pubkey: P) ->
 	}
 }
 
+/// Verify and recover a SECP256k1 ECDSA signature.
+/// - `sig` is passed in RSV format. V should be either 0/1 or 27/28.
+/// - returns `None` if the signatue is bad, the 64-byte pubkey (doesn't include the 0x04 prefix).
+pub fn secp256k1_ecdsa_recover(sig: &[u8; 65], msg: &[u8; 32]) -> Result<[u8; 64], EcdsaVerifyError> {
+	let mut pubkey = [0u8; 64];
+	match unsafe {
+		ext_secp256k1_ecdsa_recover(msg.as_ptr(), sig.as_ptr(), pubkey.as_mut_ptr())
+	} {
+		0 => Ok(pubkey),
+		1 => Err(EcdsaVerifyError::BadRS),
+		2 => Err(EcdsaVerifyError::BadV),
+		3 => Err(EcdsaVerifyError::BadSignature),
+		_ => unreachable!("`ext_secp256k1_ecdsa_recover` only returns 0, 1, 2 or 3; qed"),
+	}
+}
+
 /// Trait for things which can be printed.
 pub trait Printable {
 	fn print(self);
diff --git a/substrate/core/test-runtime/wasm/Cargo.lock b/substrate/core/test-runtime/wasm/Cargo.lock
index 0c20da9c2b..e633ec94f9 100644
--- a/substrate/core/test-runtime/wasm/Cargo.lock
+++ b/substrate/core/test-runtime/wasm/Cargo.lock
@@ -1,3 +1,8 @@
+[[package]]
+name = "arrayref"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arrayvec"
 version = "0.4.8"
@@ -46,6 +51,20 @@ dependencies = [
  "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.2.7"
@@ -138,6 +157,23 @@ name = "crunchy"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crypto-mac"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "digest"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "elastic-array"
 version = "0.10.0"
@@ -159,6 +195,11 @@ dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fixed-hash"
 version = "0.3.0"
@@ -209,6 +250,15 @@ name = "futures"
 version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "generic-array"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hash-db"
 version = "0.9.0"
@@ -247,6 +297,26 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hmac"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hmac-drbg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "httparse"
 version = "1.3.3"
@@ -336,6 +406,19 @@ name = "libc"
 version = "0.2.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libsecp256k1"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.1.5"
@@ -833,6 +916,18 @@ name = "sha1"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sha2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.1"
@@ -898,12 +993,14 @@ version = "0.1.0"
 dependencies = [
  "environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1079,6 +1176,7 @@ dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1090,6 +1188,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmi 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1248,6 +1347,14 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tiny-keccak"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio"
 version = "0.1.13"
@@ -1430,6 +1537,11 @@ dependencies = [
  "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "uint"
 version = "0.5.0"
@@ -1559,12 +1671,15 @@ dependencies = [
 ]
 
 [metadata]
+"checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 "checksum arrayvec 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f405cc4c21cd8b784f6c8fc2adf9bc00f59558f0049b5ec21517f875963040cc"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
 "checksum base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5024ee8015f02155eee35c711107ddd9a9bf3cb689cf2a9089c97e79b6e1ae83"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
+"checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
+"checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
 "checksum bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "40ade3d27603c2cb345eb0912aec461a6dec7e06a4ae48589904e808335c7afa"
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
@@ -1578,9 +1693,12 @@ dependencies = [
 "checksum crossbeam-utils 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e07fc155212827475223f0bcfae57e945e694fc90950ddf3f6695bbfd5555c72"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
 "checksum crunchy 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c240f247c278fa08a6d4820a6a222bfc6e0d999e51ba67be94f44c905b2161f2"
+"checksum crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "779015233ac67d65098614aec748ac1c756ab6677fa2e14cf8b37c08dfed1198"
+"checksum digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e5b29bf156f3f4b3c4f610a25ff69370616ae6e0657d416de22645483e72af0a"
 "checksum elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "88d4851b005ef16de812ea9acdb7bece2f0a40dd86c07b85631d7dafa54537bb"
 "checksum environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "db746025e3ea695bfa0ae744dbacd5fcfc8db51b9760cf8bd0ab69708bb93c49"
 "checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
+"checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum fixed-hash 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a557e80084b05c32b455963ff565a9de6f2866da023d6671705c6aff6f65e01c"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
@@ -1588,11 +1706,14 @@ dependencies = [
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)" = "49e7653e374fe0d0c12de4250f0bdb60680b8c80eed558c5c7538eec9c89e21b"
+"checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dc5ec43724866bbc8337e09cab4d4b5f9fdbbe589f04bdc8bfda906a639ad338"
 "checksum hash256-std-hasher 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "811bd8c26961527b7d5623b71162d865325639f8ca204d4ec90b5b87473a122d"
 "checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
 "checksum hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4da5f0e01bd8a71a224a4eedecaacfcabda388dbb7a80faf04d3514287572d95"
 "checksum hex-literal-impl 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1d340b6514f232f6db1bd16db65302a5278a04fef9ce867cb932e7e5fa21130a"
+"checksum hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7a13f4163aa0c5ca1be584aace0e2212b2e41be5478218d4f657f5f778b2ae2a"
+"checksum hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4fe727d41d2eec0a6574d887914347e5ff96a3b87177817e2a9820c5c87fecc2"
 "checksum httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8734b0cfd3bc3e101ec59100e101c2eecd19282202e87808b3037b442777a83"
 "checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
 "checksum impl-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9c88568d828291c50eed30cd7fb9f8e688ad0013620186fa3e777b9f206c79f2"
@@ -1606,6 +1727,7 @@ dependencies = [
 "checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum libc 0.2.44 (registry+https://github.com/rust-lang/crates.io-index)" = "10923947f84a519a45c8fefb7dd1b3e8c08747993381adee176d7a82b4195311"
+"checksum libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "688e8d65e495567c2c35ea0001b26b9debf0b4ea11f8cccc954233b75fc3428a"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
@@ -1666,6 +1788,7 @@ dependencies = [
 "checksum serde_derive 1.0.81 (registry+https://github.com/rust-lang/crates.io-index)" = "477b13b646f5b5b56fc95bedfc3b550d12141ce84f466f6c44b9a17589923885"
 "checksum serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "c37ccd6be3ed1fdf419ee848f7c758eb31b054d7cd3ae3600e3bae0adf569811"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
+"checksum sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d963c78ce367df26d7ea8b8cc655c651b42e8a1e584e869c1e17dae3ccb116a"
 "checksum slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5f9776d6b986f77b35c6cf846c11ad986ff128fe0b2b63a3628e3755e8d3102d"
 "checksum slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1e1a2eec401952cd7b12a84ea120e2d57281329940c3f93c2bf04f462539508e"
 "checksum slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e544d16c6b230d84c866662fe55e31aacfca6ae71e6fc49ae9a311cb379bfc2f"
@@ -1678,6 +1801,7 @@ dependencies = [
 "checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+"checksum tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e9175261fbdb60781fcd388a4d6cc7e14764a2b629a7ad94abb439aed223a44f"
 "checksum tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "a7817d4c98cc5be21360b3b37d6036fe9b7aefa5b7a201b7b16ff33423822f7d"
 "checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
 "checksum tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "331c8acc267855ec06eb0c94618dcbbfea45bed2d20b77252940095273fb58f6"
@@ -1693,6 +1817,7 @@ dependencies = [
 "checksum trie-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6fce41ab9c34e9a79f3f3c149c17dfedba15d10ee273ef1ae40dd48f7d91eb0e"
 "checksum trie-root 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6c08a925fd6305f1b7ebbbb663352ddbfe3033648303a91ab127b8b5b12f04"
 "checksum twox-hash 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "555cd4909480122bbbf21e34faac4cb08a171f324775670447ed116726c474af"
+"checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum uint 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "082df6964410f6aa929a61ddfafc997e4f32c62c22490e439ac351cec827f436"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
 "checksum unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "6a0180bc61fc5a987082bfa111f4cc95c4caff7f9799f3e46df09163a937aa25"
diff --git a/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm b/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm
index d767186a98..f2fabeda06 100644
Binary files a/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm and b/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm differ
diff --git a/substrate/node/runtime/wasm/Cargo.lock b/substrate/node/runtime/wasm/Cargo.lock
index 8c4900ee6c..8b29842a65 100644
--- a/substrate/node/runtime/wasm/Cargo.lock
+++ b/substrate/node/runtime/wasm/Cargo.lock
@@ -1,3 +1,8 @@
+[[package]]
+name = "arrayref"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arrayvec"
 version = "0.4.8"
@@ -46,6 +51,20 @@ dependencies = [
  "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.2.7"
@@ -138,6 +157,23 @@ name = "crunchy"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crypto-mac"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "digest"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "elastic-array"
 version = "0.10.0"
@@ -159,6 +195,11 @@ dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fixed-hash"
 version = "0.3.0"
@@ -209,6 +250,15 @@ name = "futures"
 version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "generic-array"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hash-db"
 version = "0.9.0"
@@ -247,6 +297,26 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hmac"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hmac-drbg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "httparse"
 version = "1.3.3"
@@ -336,6 +406,19 @@ name = "libc"
 version = "0.2.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libsecp256k1"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.1.5"
@@ -909,6 +992,18 @@ name = "sha1"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sha2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.1"
@@ -974,12 +1069,14 @@ version = "0.1.0"
 dependencies = [
  "environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1456,6 +1553,7 @@ dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1467,6 +1565,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
+ "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmi 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1608,6 +1707,14 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tiny-keccak"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio"
 version = "0.1.13"
@@ -1790,6 +1897,11 @@ dependencies = [
  "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "uint"
 version = "0.5.0"
@@ -1919,12 +2031,15 @@ dependencies = [
 ]
 
 [metadata]
+"checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 "checksum arrayvec 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f405cc4c21cd8b784f6c8fc2adf9bc00f59558f0049b5ec21517f875963040cc"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
 "checksum base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5024ee8015f02155eee35c711107ddd9a9bf3cb689cf2a9089c97e79b6e1ae83"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
+"checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
+"checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
 "checksum bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "40ade3d27603c2cb345eb0912aec461a6dec7e06a4ae48589904e808335c7afa"
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
@@ -1938,9 +2053,12 @@ dependencies = [
 "checksum crossbeam-utils 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e07fc155212827475223f0bcfae57e945e694fc90950ddf3f6695bbfd5555c72"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
 "checksum crunchy 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c240f247c278fa08a6d4820a6a222bfc6e0d999e51ba67be94f44c905b2161f2"
+"checksum crypto-mac 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "779015233ac67d65098614aec748ac1c756ab6677fa2e14cf8b37c08dfed1198"
+"checksum digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e5b29bf156f3f4b3c4f610a25ff69370616ae6e0657d416de22645483e72af0a"
 "checksum elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "88d4851b005ef16de812ea9acdb7bece2f0a40dd86c07b85631d7dafa54537bb"
 "checksum environmental 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "db746025e3ea695bfa0ae744dbacd5fcfc8db51b9760cf8bd0ab69708bb93c49"
 "checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
+"checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum fixed-hash 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a557e80084b05c32b455963ff565a9de6f2866da023d6671705c6aff6f65e01c"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
@@ -1948,11 +2066,14 @@ dependencies = [
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)" = "49e7653e374fe0d0c12de4250f0bdb60680b8c80eed558c5c7538eec9c89e21b"
+"checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum hash-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dc5ec43724866bbc8337e09cab4d4b5f9fdbbe589f04bdc8bfda906a639ad338"
 "checksum hash256-std-hasher 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "811bd8c26961527b7d5623b71162d865325639f8ca204d4ec90b5b87473a122d"
 "checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
 "checksum hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4da5f0e01bd8a71a224a4eedecaacfcabda388dbb7a80faf04d3514287572d95"
 "checksum hex-literal-impl 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1d340b6514f232f6db1bd16db65302a5278a04fef9ce867cb932e7e5fa21130a"
+"checksum hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7a13f4163aa0c5ca1be584aace0e2212b2e41be5478218d4f657f5f778b2ae2a"
+"checksum hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4fe727d41d2eec0a6574d887914347e5ff96a3b87177817e2a9820c5c87fecc2"
 "checksum httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8734b0cfd3bc3e101ec59100e101c2eecd19282202e87808b3037b442777a83"
 "checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
 "checksum impl-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9c88568d828291c50eed30cd7fb9f8e688ad0013620186fa3e777b9f206c79f2"
@@ -1966,6 +2087,7 @@ dependencies = [
 "checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum libc 0.2.44 (registry+https://github.com/rust-lang/crates.io-index)" = "10923947f84a519a45c8fefb7dd1b3e8c08747993381adee176d7a82b4195311"
+"checksum libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "688e8d65e495567c2c35ea0001b26b9debf0b4ea11f8cccc954233b75fc3428a"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
@@ -2028,6 +2150,7 @@ dependencies = [
 "checksum serde_derive 1.0.81 (registry+https://github.com/rust-lang/crates.io-index)" = "477b13b646f5b5b56fc95bedfc3b550d12141ce84f466f6c44b9a17589923885"
 "checksum serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "c37ccd6be3ed1fdf419ee848f7c758eb31b054d7cd3ae3600e3bae0adf569811"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
+"checksum sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d963c78ce367df26d7ea8b8cc655c651b42e8a1e584e869c1e17dae3ccb116a"
 "checksum slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5f9776d6b986f77b35c6cf846c11ad986ff128fe0b2b63a3628e3755e8d3102d"
 "checksum slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1e1a2eec401952cd7b12a84ea120e2d57281329940c3f93c2bf04f462539508e"
 "checksum slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e544d16c6b230d84c866662fe55e31aacfca6ae71e6fc49ae9a311cb379bfc2f"
@@ -2040,6 +2163,7 @@ dependencies = [
 "checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+"checksum tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e9175261fbdb60781fcd388a4d6cc7e14764a2b629a7ad94abb439aed223a44f"
 "checksum tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "a7817d4c98cc5be21360b3b37d6036fe9b7aefa5b7a201b7b16ff33423822f7d"
 "checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
 "checksum tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "331c8acc267855ec06eb0c94618dcbbfea45bed2d20b77252940095273fb58f6"
@@ -2055,6 +2179,7 @@ dependencies = [
 "checksum trie-db 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6fce41ab9c34e9a79f3f3c149c17dfedba15d10ee273ef1ae40dd48f7d91eb0e"
 "checksum trie-root 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6c08a925fd6305f1b7ebbbb663352ddbfe3033648303a91ab127b8b5b12f04"
 "checksum twox-hash 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "555cd4909480122bbbf21e34faac4cb08a171f324775670447ed116726c474af"
+"checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum uint 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "082df6964410f6aa929a61ddfafc997e4f32c62c22490e439ac351cec827f436"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
 "checksum unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "6a0180bc61fc5a987082bfa111f4cc95c4caff7f9799f3e46df09163a937aa25"
diff --git a/substrate/node/runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm b/substrate/node/runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm
index 7200683148..2531717ea4 100644
Binary files a/substrate/node/runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm and b/substrate/node/runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm differ
diff --git a/substrate/srml/contract/src/wasm/mod.rs b/substrate/srml/contract/src/wasm/mod.rs
index aba320db38..079cb4aac6 100644
--- a/substrate/srml/contract/src/wasm/mod.rs
+++ b/substrate/srml/contract/src/wasm/mod.rs
@@ -25,7 +25,6 @@ use crate::gas::GasMeter;
 use rstd::prelude::*;
 use sandbox;
 
-
 #[macro_use]
 mod env_def;
 mod code_cache;
diff --git a/substrate/srml/staking/src/lib.rs b/substrate/srml/staking/src/lib.rs
index db1405a466..525edd86e5 100644
--- a/substrate/srml/staking/src/lib.rs
+++ b/substrate/srml/staking/src/lib.rs
@@ -46,7 +46,7 @@ extern crate sr_io as runtime_io;
 extern crate srml_timestamp as timestamp;
 
 use rstd::{prelude::*, cmp};
-use codec::{HasCompact, Compact};
+use codec::HasCompact;
 use runtime_support::{Parameter, StorageValue, StorageMap, dispatch::Result};
 use session::OnSessionChange;
 use primitives::{Perbill, traits::{Zero, One, Bounded, As, StaticLookup}};