diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 08ee2e5604..7a7ba66182 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -1661,11 +1661,6 @@ dependencies = [
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nan-preserving-float"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "native-tls"
 version = "0.2.2"
@@ -2609,7 +2604,7 @@ dependencies = [
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
  "wabt 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3177,7 +3172,7 @@ dependencies = [
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
  "wabt 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3313,7 +3308,7 @@ dependencies = [
  "twox-hash 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -4156,12 +4151,11 @@ dependencies = [
 
 [[package]]
 name = "wasmi"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory_units 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4473,7 +4467,6 @@ dependencies = [
 "checksum multihash 0.8.1-pre (git+https://github.com/libp2p/rust-libp2p?rev=d961e656a74d1bab5366d371a06f9e10d5f4a6c5)" = "<none>"
 "checksum multistream-select 0.1.0 (git+https://github.com/libp2p/rust-libp2p?rev=d961e656a74d1bab5366d371a06f9e10d5f4a6c5)" = "<none>"
 "checksum names 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef320dab323286b50fb5cdda23f61c796a72a89998ab565ca32525c5c556f2da"
-"checksum nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34d4f00fcc2f4c9efa8cc971db0da9e28290e28e97af47585e48691ef10ff31f"
 "checksum native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ff8e08de0070bbf4c31f452ea2a70db092f36f6f2e4d897adf5674477d488fb2"
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
 "checksum nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d37e713a259ff641624b6cb20e3b12b2952313ba36b6823c0f16e6cfd9e5de17"
@@ -4650,7 +4643,7 @@ dependencies = [
 "checksum wabt 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "182ae543249ccf2705f324d233891c1176fca142e137b55ba43d9dbfe93f18a2"
 "checksum wabt-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ca77c6b934a2b32618941b2f565aac43b8cb7141378c3b4fba4d8fcdcd57da3"
 "checksum want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "797464475f30ddb8830cc529aaaae648d581f99e2036a928877dfde027ddf6b3"
-"checksum wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d184c4b7081f30316f74f8d73c197314dcb56ea7af9323522b42a2fa9cb19453"
+"checksum wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8a60b9508cff2b7c27ed41200dd668806280740fadc8c88440e9c88625e84f1a"
 "checksum websocket 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c9faed2bff8af2ea6b9f8b917d3d00b467583f6781fe3def174a9e33c879703"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
diff --git a/substrate/core/client/db/src/lib.rs b/substrate/core/client/db/src/lib.rs
index bdc82bfc35..a01d5a368c 100644
--- a/substrate/core/client/db/src/lib.rs
+++ b/substrate/core/client/db/src/lib.rs
@@ -1276,6 +1276,62 @@ mod tests {
 		check_changes(&backend, 2, changes2);
 	}
 
+	#[test]
+	fn changes_trie_storage_works_with_forks() {
+		let backend = Backend::<Block>::new_test(1000, 100);
+
+		let changes0 = vec![(b"k0".to_vec(), b"v0".to_vec())];
+		let changes1 = vec![(b"k1".to_vec(), b"v1".to_vec())];
+		let changes2 = vec![(b"k2".to_vec(), b"v2".to_vec())];
+		let block0 = insert_header(&backend, 0, Default::default(), changes0.clone(), Default::default());
+		let block1 = insert_header(&backend, 1, block0, changes1.clone(), Default::default());
+		let block2 = insert_header(&backend, 2, block1, changes2.clone(), Default::default());
+
+		let changes2_1_0 = vec![(b"k3".to_vec(), b"v3".to_vec())];
+		let changes2_1_1 = vec![(b"k4".to_vec(), b"v4".to_vec())];
+		let block2_1_0 = insert_header(&backend, 3, block2, changes2_1_0.clone(), Default::default());
+		let block2_1_1 = insert_header(&backend, 4, block2_1_0, changes2_1_1.clone(), Default::default());
+
+		let changes2_2_0 = vec![(b"k5".to_vec(), b"v5".to_vec())];
+		let changes2_2_1 = vec![(b"k6".to_vec(), b"v6".to_vec())];
+		let block2_2_0 = insert_header(&backend, 3, block2, changes2_2_0.clone(), Default::default());
+		let block2_2_1 = insert_header(&backend, 4, block2_2_0, changes2_2_1.clone(), Default::default());
+
+		// finalize block1
+		backend.changes_tries_storage.meta.write().finalized_number = 1;
+
+		// branch1: when asking for finalized block hash
+		let (changes1_root, _) = prepare_changes(changes1);
+		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 1), Ok(Some(changes1_root)));
+
+		// branch2: when asking for finalized block hash
+		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_2_1, number: 4 };
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 1), Ok(Some(changes1_root)));
+
+		// branch1: when asking for non-finalized block hash (search by traversal)
+		let (changes2_1_0_root, _) = prepare_changes(changes2_1_0);
+		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_1_0_root)));
+
+		// branch2: when asking for non-finalized block hash (search using canonicalized hint)
+		let (changes2_2_0_root, _) = prepare_changes(changes2_2_0);
+		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_2_1, number: 4 };
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
+
+		// finalize first block of branch2 (block2_2_0)
+		backend.changes_tries_storage.meta.write().finalized_number = 3;
+
+		// branch2: when asking for finalized block of this branch
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
+
+		// branch1: when asking for finalized block of other branch
+		// => result is incorrect (returned for the block of branch1), but this is expected,
+		// because the other fork is abandoned (forked before finalized header)
+		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
+		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
+	}
+
 	#[test]
 	fn changes_tries_with_digest_are_pruned_on_finalization() {
 		let mut backend = Backend::<Block>::new_test(1000, 100);
@@ -1378,6 +1434,7 @@ mod tests {
 			backend.blockchain().header(BlockId::Number(num)).unwrap().unwrap().digest().logs().iter()
 				.find(|i| i.as_changes_trie_root().is_some()).unwrap().as_changes_trie_root().unwrap().clone()
 		}
+
 		let root1 = read_changes_trie_root(&backend, 1); assert_eq!(backend.changes_tries_storage.root(&anchor, 1).unwrap(), Some(root1));
 		let root2 = read_changes_trie_root(&backend, 2); assert_eq!(backend.changes_tries_storage.root(&anchor, 2).unwrap(), Some(root2));
 		let root3 = read_changes_trie_root(&backend, 3); assert_eq!(backend.changes_tries_storage.root(&anchor, 3).unwrap(), Some(root3));
@@ -1400,62 +1457,6 @@ mod tests {
 		assert!(backend.changes_tries_storage.get(&root3).unwrap().is_some());
 	}
 
-	#[test]
-	fn changes_trie_storage_works_with_forks() {
-		let backend = Backend::<Block>::new_test(1000, 100);
-
-		let changes0 = vec![(b"k0".to_vec(), b"v0".to_vec())];
-		let changes1 = vec![(b"k1".to_vec(), b"v1".to_vec())];
-		let changes2 = vec![(b"k2".to_vec(), b"v2".to_vec())];
-		let block0 = insert_header(&backend, 0, Default::default(), changes0.clone(), Default::default());
-		let block1 = insert_header(&backend, 1, block0, changes1.clone(), Default::default());
-		let block2 = insert_header(&backend, 2, block1, changes2.clone(), Default::default());
-
-		let changes2_1_0 = vec![(b"k3".to_vec(), b"v3".to_vec())];
-		let changes2_1_1 = vec![(b"k4".to_vec(), b"v4".to_vec())];
-		let block2_1_0 = insert_header(&backend, 3, block2, changes2_1_0.clone(), Default::default());
-		let block2_1_1 = insert_header(&backend, 4, block2_1_0, changes2_1_1.clone(), Default::default());
-
-		let changes2_2_0 = vec![(b"k5".to_vec(), b"v5".to_vec())];
-		let changes2_2_1 = vec![(b"k6".to_vec(), b"v6".to_vec())];
-		let block2_2_0 = insert_header(&backend, 3, block2, changes2_2_0.clone(), Default::default());
-		let block2_2_1 = insert_header(&backend, 4, block2_2_0, changes2_2_1.clone(), Default::default());
-
-		// finalize block1
-		backend.changes_tries_storage.meta.write().finalized_number = 1;
-
-		// branch1: when asking for finalized block hash
-		let (changes1_root, _) = prepare_changes(changes1);
-		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 1), Ok(Some(changes1_root)));
-
-		// branch2: when asking for finalized block hash
-		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_2_1, number: 4 };
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 1), Ok(Some(changes1_root)));
-
-		// branch1: when asking for non-finalized block hash (search by traversal)
-		let (changes2_1_0_root, _) = prepare_changes(changes2_1_0);
-		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_1_0_root)));
-
-		// branch2: when asking for non-finalized block hash (search using canonicalized hint)
-		let (changes2_2_0_root, _) = prepare_changes(changes2_2_0);
-		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_2_1, number: 4 };
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
-
-		// finalize first block of branch2 (block2_2_0)
-		backend.changes_tries_storage.meta.write().finalized_number = 3;
-
-		// branch2: when asking for finalized block of this branch
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
-
-		// branch1: when asking for finalized block of other branch
-		// => result is incorrect (returned for the block of branch1), but this is expected,
-		// because the other fork is abandoned (forked before finalized header)
-		let anchor = state_machine::ChangesTrieAnchorBlockId { hash: block2_1_1, number: 4 };
-		assert_eq!(backend.changes_tries_storage.root(&anchor, 3), Ok(Some(changes2_2_0_root)));
-	}
-
 	#[test]
 	fn tree_route_works() {
 		let backend = Backend::<Block>::new_test(1000, 100);
diff --git a/substrate/core/client/src/runtime_api/macros.rs b/substrate/core/client/src/runtime_api/macros.rs
index b58f2143c8..1721fbd416 100644
--- a/substrate/core/client/src/runtime_api/macros.rs
+++ b/substrate/core/client/src/runtime_api/macros.rs
@@ -465,14 +465,20 @@ macro_rules! impl_runtime_apis {
 			)*
 		}
 		impl_runtime_apis! {
+			@EXTEND_FUNCTIONS
 			$runtime;
-			$( $fn_name ( $( $arg_name: $arg_ty ),* ); )*;
+			;
+			$trait_name;
+			$( $( $generic ),* )*;
+			{ $( $fn_name ( $( $arg_name: $arg_ty ),* ); )* }
 			$( $rest )*
 		}
 	};
 	(
 		$runtime:ident;
-		$( $fn_name_parsed:ident ( $( $arg_name_parsed:ident : $arg_ty_parsed:ty ),* ); )*;
+		$( $trait_name_parsed:ident $( < $( $parsed_generic:ident ),* > )*::$fn_name_parsed:ident (
+			$( $arg_name_parsed:ident : $arg_ty_parsed:ty ),* );
+		)*;
 		impl $trait_name:ident $( < $( $generic:ident ),* > )* for $runtime_ignore:ident {
 			$(
 				fn $fn_name:ident ( $( $arg_name:ident : $arg_ty:ty ),* ) $( -> $return_ty:ty )* {
@@ -490,15 +496,73 @@ macro_rules! impl_runtime_apis {
 			)*
 		}
 		impl_runtime_apis! {
+			@EXTEND_FUNCTIONS
 			$runtime;
-			$( $fn_name_parsed ( $( $arg_name_parsed: $arg_ty_parsed ),* ); )*
-			$( $fn_name ( $( $arg_name: $arg_ty ),* ); )*;
+			$(
+				$trait_name_parsed $( < $( $parsed_generic ),* > )*
+					::$fn_name_parsed ( $( $arg_name_parsed: $arg_ty_parsed ),* );
+			)*;
+			$trait_name;
+			$( $( $generic ),* )*;
+			{ $( $fn_name ( $( $arg_name: $arg_ty ),* ); )* }
+			$( $rest )*
+		}
+	};
+	(@EXTEND_FUNCTIONS
+		$runtime:ident;
+		$( $trait_name_parsed:ident $( < $( $parsed_generic:ident ),* > )*::$fn_name_parsed:ident (
+			$( $arg_name_parsed:ident : $arg_ty_parsed:ty ),* );
+		)*;
+		$trait_name:ident;
+		$( $generic:ident ),*;
+		{
+			$fn_name_extend:ident ( $( $arg_name_extend:ident : $arg_ty_extend:ty ),* );
+			$( $extend_rest:tt )*
+		}
+		$( $rest:tt )*
+	) => {
+		impl_runtime_apis! {
+			@EXTEND_FUNCTIONS
+			$runtime;
+			$(
+				$trait_name_parsed $( < $( $parsed_generic ),* > )*
+					::$fn_name_parsed ( $( $arg_name_parsed: $arg_ty_parsed ),* );
+			)*
+			$trait_name < $( $generic ),* >
+				::$fn_name_extend ( $( $arg_name_extend: $arg_ty_extend ),* );;
+			$trait_name;
+			$( $generic ),*;
+			{
+				$( $extend_rest )*
+			}
+			$( $rest )*
+		}
+	};
+	(@EXTEND_FUNCTIONS
+		$runtime:ident;
+		$( $trait_name_parsed:ident $( < $( $parsed_generic:ident ),* > )*::$fn_name_parsed:ident (
+			$( $arg_name_parsed:ident : $arg_ty_parsed:ty ),* );
+		)*;
+		$trait_name:ident;
+		$( $generic:ident ),*;
+		{}
+		$( $rest:tt )*
+	) => {
+		impl_runtime_apis! {
+			$runtime;
+			$(
+				$trait_name_parsed $( < $( $parsed_generic ),* > )*
+					::$fn_name_parsed ( $( $arg_name_parsed: $arg_ty_parsed ),* );
+			)*;
 			$( $rest )*
 		}
 	};
 	(
 		$runtime:ident;
-		$( $fn_name:ident ( $( $arg_name:ident : $arg_ty:ty ),* ); )*;
+		$(
+			$trait_name:ident $( < $( $generic:ident ),* > )*
+				::$fn_name:ident ( $( $arg_name:ident : $arg_ty:ty ),* );
+		)*;
 	) => {
 		pub mod api {
 			use super::*;
@@ -511,6 +575,7 @@ macro_rules! impl_runtime_apis {
 							Some({impl_runtime_apis! {
 								@GENERATE_IMPL_CALL
 								$runtime;
+								$trait_name $( < $( $generic ),* > )*;
 								$fn_name;
 								$( $arg_name : $arg_ty ),*;
 								data;
@@ -536,6 +601,7 @@ macro_rules! impl_runtime_apis {
 					let output = { impl_runtime_apis! {
 						@GENERATE_IMPL_CALL
 						$runtime;
+						$trait_name $( < $( $generic ),* > )*;
 						$fn_name;
 						$( $arg_name : $arg_ty ),*;
 						input;
@@ -553,6 +619,7 @@ macro_rules! impl_runtime_apis {
 	};
 	(@GENERATE_IMPL_CALL
 		$runtime:ident;
+		$trait_name:ident $( < $( $generic:ident ),* > )*;
 		$fn_name:ident;
 		$arg_name:ident : $arg_ty:ty;
 		$input:ident;
@@ -562,11 +629,12 @@ macro_rules! impl_runtime_apis {
 			None => panic!("Bad input data provided to {}", stringify!($fn_name)),
 		};
 
-		let output = $runtime::$fn_name($arg_name);
+		let output = <$runtime as $trait_name $( < $( $generic ),* > )*>::$fn_name($arg_name);
 		$crate::runtime_api::Encode::encode(&output)
 	};
 	(@GENERATE_IMPL_CALL
 		$runtime:ident;
+		$trait_name:ident $( < $( $generic:ident ),* > )*;
 		$fn_name:ident;
 		$( $arg_name:ident : $arg_ty:ty ),*;
 		$input:ident;
@@ -576,7 +644,7 @@ macro_rules! impl_runtime_apis {
 			None => panic!("Bad input data provided to {}", stringify!($fn_name)),
 		};
 
-		let output = $runtime::$fn_name($( $arg_name ),*);
+		let output = <$runtime as $trait_name $( < $( $generic ),* > )*>::$fn_name($( $arg_name ),*);
 		$crate::runtime_api::Encode::encode(&output)
 	};
 }
diff --git a/substrate/core/consensus/aura/src/lib.rs b/substrate/core/consensus/aura/src/lib.rs
index babfef8dc1..1869eba5dd 100644
--- a/substrate/core/consensus/aura/src/lib.rs
+++ b/substrate/core/consensus/aura/src/lib.rs
@@ -286,7 +286,6 @@ enum CheckedHeader<H> {
 	Checked(H, u64, ed25519::Signature),
 }
 
-
 /// check a header has been signed by the right key. If the slot is too far in the future, an error will be returned.
 /// if it's successful, returns the pre-header, the slot number, and the signat.
 //
@@ -328,15 +327,37 @@ fn check_header<B: Block>(slot_now: u64, mut header: B::Header, hash: B::Hash, a
 	}
 }
 
-/// A verifier for Aura blocks.
-pub struct AuraVerifier<C> {
-	config: Config,
-	client: Arc<C>,
+/// Extra verification for Aura blocks.
+pub trait ExtraVerification<B: Block>: Send + Sync {
+	/// Future that resolves when the block is verified or fails with error if not.
+	type Verified: IntoFuture<Item=(),Error=String>;
+
+	/// Do additional verification for this block.
+	fn verify(&self, header: &B::Header, body: Option<&[B::Extrinsic]>) -> Self::Verified;
 }
 
-impl<B: Block, C> Verifier<B> for AuraVerifier<C> where
+/// No-op extra verification.
+#[derive(Debug, Clone, Copy)]
+pub struct NothingExtra;
+
+impl<B: Block> ExtraVerification<B> for NothingExtra {
+	type Verified = Result<(), String>;
+
+	fn verify(&self, _: &B::Header, _: Option<&[B::Extrinsic]>) -> Self::Verified {
+		Ok(())
+	}
+}
+/// A verifier for Aura blocks.
+pub struct AuraVerifier<C, E> {
+	config: Config,
+	client: Arc<C>,
+	extra: E,
+}
+
+impl<B: Block, C, E> Verifier<B> for AuraVerifier<C, E> where
 	C: Authorities<B> + BlockImport<B> + Send + Sync,
 	DigestItemFor<B>: CompatibleDigestItem,
+	E: ExtraVerification<B>,
 {
 	fn verify(
 		&self,
@@ -352,6 +373,8 @@ impl<B: Block, C> Verifier<B> for AuraVerifier<C> where
 		let authorities = self.client.authorities(&BlockId::Hash(parent_hash))
 			.map_err(|e| format!("Could not fetch authorities at {:?}: {:?}", parent_hash, e))?;
 
+		let extra_verification = self.extra.verify(&header, body.as_ref().map(|x| &x[..]));
+
 		// we add one to allow for some small drift.
 		// FIXME: in the future, alter this queue to allow deferring of headers
 		// https://github.com/paritytech/substrate/issues/1019
@@ -362,6 +385,7 @@ impl<B: Block, C> Verifier<B> for AuraVerifier<C> where
 
 				debug!(target: "aura", "Checked {:?}; importing.", pre_header);
 
+				extra_verification.into_future().wait()?;
 				let import_block = ImportBlock {
 					origin,
 					header: pre_header,
@@ -384,20 +408,19 @@ impl<B: Block, C> Verifier<B> for AuraVerifier<C> where
 }
 
 /// The Aura import queue type.
-pub type AuraImportQueue<B, C> = BasicQueue<B, AuraVerifier<C>>;
+pub type AuraImportQueue<B, C, E> = BasicQueue<B, AuraVerifier<C, E>>;
 
 /// Start an import queue for the Aura consensus algorithm.
-pub fn import_queue<B, C>(config: Config, client: Arc<C>) -> AuraImportQueue<B, C> where
+pub fn import_queue<B, C, E>(config: Config, client: Arc<C>, extra: E) -> AuraImportQueue<B, C, E> where
 	B: Block,
 	C: Authorities<B> + BlockImport<B,Error=client::error::Error> + Send + Sync,
 	DigestItemFor<B>: CompatibleDigestItem,
+	E: ExtraVerification<B>,
 {
-	let verifier = Arc::new(AuraVerifier { config, client: client.clone() });
+	let verifier = Arc::new(AuraVerifier { config, client: client.clone(), extra, });
 	BasicQueue::new(verifier, client)
 }
 
-
-
 #[cfg(test)]
 mod tests {
 	use super::*;
@@ -443,12 +466,12 @@ mod tests {
 	const TEST_ROUTING_INTERVAL: Duration = Duration::from_millis(50);
 
 	pub struct AuraTestNet {
-		peers: Vec<Arc<Peer<AuraVerifier<PeersClient>, ()>>>,
+		peers: Vec<Arc<Peer<AuraVerifier<PeersClient, NothingExtra>, ()>>>,
 		started: bool
 	}
 
 	impl TestNetFactory for AuraTestNet {
-		type Verifier = AuraVerifier<PeersClient>;
+		type Verifier = AuraVerifier<PeersClient, NothingExtra>;
 		type PeerData = ();
 
 		/// Create new test network with peers and given config.
@@ -463,7 +486,7 @@ mod tests {
 			-> Arc<Self::Verifier>
 		{
 			let config = Config { local_key: None, slot_duration: SLOT_DURATION };
-			Arc::new(AuraVerifier { client, config })
+			Arc::new(AuraVerifier { client, config, extra: NothingExtra })
 		}
 
 		fn peer(&self, i: usize) -> &Peer<Self::Verifier, ()> {
diff --git a/substrate/core/executor/Cargo.toml b/substrate/core/executor/Cargo.toml
index a3de26a3cb..c6cddf341c 100644
--- a/substrate/core/executor/Cargo.toml
+++ b/substrate/core/executor/Cargo.toml
@@ -14,7 +14,7 @@ substrate-state-machine = { path = "../state-machine"  }
 sr-version = { path = "../sr-version" }
 serde = "1.0"
 serde_derive = "1.0"
-wasmi = { version = "0.4.1" }
+wasmi = { version = "0.4.2" }
 byteorder = "1.1"
 lazy_static = "1.0"
 parking_lot = "*"
diff --git a/substrate/core/primitives/Cargo.toml b/substrate/core/primitives/Cargo.toml
index 171841f1e2..5821a5fe94 100644
--- a/substrate/core/primitives/Cargo.toml
+++ b/substrate/core/primitives/Cargo.toml
@@ -15,7 +15,7 @@ serde_derive = { version = "1.0", optional = true }
 uint = { version = "0.5.0-beta", default-features = false }
 twox-hash = { version = "1.1.0", optional = true }
 byteorder = { version = "1.1", default-features = false }
-wasmi = { version = "0.4.1", optional = true }
+wasmi = { version = "0.4.2", optional = true }
 hash-db = { git = "https://github.com/paritytech/trie", default-features = false }
 hash256-std-hasher = { git = "https://github.com/paritytech/trie", default-features = false }
 ring = { version = "0.12", optional = true }
diff --git a/substrate/core/sr-sandbox/Cargo.toml b/substrate/core/sr-sandbox/Cargo.toml
index 8cb35aed79..daa9408296 100755
--- a/substrate/core/sr-sandbox/Cargo.toml
+++ b/substrate/core/sr-sandbox/Cargo.toml
@@ -8,7 +8,7 @@ build = "build.rs"
 rustc_version = "0.2"
 
 [dependencies]
-wasmi = { version = "0.4.1", optional = true }
+wasmi = { version = "0.4.2", optional = true }
 substrate-primitives = { path = "../primitives", default-features = false }
 sr-std = { path = "../sr-std", default-features = false }
 parity-codec = { version = "2.1", default-features = false }
diff --git a/substrate/core/test-runtime/wasm/Cargo.lock b/substrate/core/test-runtime/wasm/Cargo.lock
index f9c0964148..c268f0c400 100644
--- a/substrate/core/test-runtime/wasm/Cargo.lock
+++ b/substrate/core/test-runtime/wasm/Cargo.lock
@@ -472,11 +472,6 @@ dependencies = [
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nan-preserving-float"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "net2"
 version = "0.2.33"
@@ -985,7 +980,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1019,7 +1014,7 @@ dependencies = [
  "twox-hash 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.5.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1379,12 +1374,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "wasmi"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory_units 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1507,7 +1501,6 @@ dependencies = [
 "checksum mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "46e73a04c2fa6250b8d802134d56d554a9ec2922bf977777c805ea5def61ce40"
 "checksum mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "966257a94e196b11bb43aca423754d87429960a768de9414f3691d6957abf125"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
-"checksum nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34d4f00fcc2f4c9efa8cc971db0da9e28290e28e97af47585e48691ef10ff31f"
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
 "checksum nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
 "checksum num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "e83d528d2677f0518c570baf2b7abdcf0cd2d248860b68507bdcb3e91d4c0cea"
@@ -1586,7 +1579,7 @@ dependencies = [
 "checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-"checksum wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d184c4b7081f30316f74f8d73c197314dcb56ea7af9323522b42a2fa9cb19453"
+"checksum wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8a60b9508cff2b7c27ed41200dd668806280740fadc8c88440e9c88625e84f1a"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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 142b7da402..d353d621df 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/cli/src/chain_spec.rs b/substrate/node/cli/src/chain_spec.rs
index d8bc5bad5d..ea634ab06e 100644
--- a/substrate/node/cli/src/chain_spec.rs
+++ b/substrate/node/cli/src/chain_spec.rs
@@ -59,6 +59,7 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 		consensus: Some(ConsensusConfig {
 			code: include_bytes!("../../runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm").to_vec(),    // TODO change
 			authorities: initial_authorities.clone(),
+			_genesis_phantom_data: Default::default(),
 		}),
 		system: None,
 		balances: Some(BalancesConfig {
@@ -69,10 +70,12 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			transfer_fee: 1 * CENTS,
 			creation_fee: 1 * CENTS,
 			reclaim_rebate: 1 * CENTS,
+			_genesis_phantom_data: Default::default(),
 		}),
 		session: Some(SessionConfig {
 			validators: initial_authorities.iter().cloned().map(Into::into).collect(),
 			session_length: 5 * MINUTES,
+			_genesis_phantom_data: Default::default(),
 		}),
 		staking: Some(StakingConfig {
 			current_era: 0,
@@ -86,11 +89,13 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			bonding_duration: 1 * DAYS,
 			offline_slash_grace: 4,
 			minimum_validator_count: 4,
+			_genesis_phantom_data: Default::default(),
 		}),
 		democracy: Some(DemocracyConfig {
 			launch_period: 5 * MINUTES,    // 1 day per public referendum
 			voting_period: 5 * MINUTES,    // 3 days to discuss & vote on an active referendum
 			minimum_deposit: 50 * DOLLARS,    // 12000 as the minimum deposit for a referendum
+			_genesis_phantom_data: Default::default(),
 		}),
 		council_seats: Some(CouncilSeatsConfig {
 			active_council: vec![],
@@ -103,19 +108,23 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			term_duration: 28 * DAYS,
 			desired_seats: 0,
 			inactive_grace_period: 1,    // one additional vote should go by before an inactive voter can be reaped.
+			_genesis_phantom_data: Default::default(),
 		}),
 		council_voting: Some(CouncilVotingConfig {
 			cooloff_period: 4 * DAYS,
 			voting_period: 1 * DAYS,
+			_genesis_phantom_data: Default::default(),
 		}),
 		timestamp: Some(TimestampConfig {
 			period: SECS_PER_BLOCK,
+			_genesis_phantom_data: Default::default(),
 		}),
 		treasury: Some(TreasuryConfig {
 			proposal_bond: Permill::from_percent(5),
 			proposal_bond_minimum: 1 * DOLLARS,
 			spend_period: 1 * DAYS,
 			burn: Permill::from_percent(50),
+			_genesis_phantom_data: Default::default(),
 		}),
 		contract: Some(ContractConfig {
 			contract_fee: 1 * CENTS,
@@ -125,9 +134,11 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			max_depth: 1024,
 			block_gas_limit: 10_000_000,
 			current_schedule: Default::default(),
+			_genesis_phantom_data: Default::default(),
 		}),
 		upgrade_key: Some(UpgradeKeyConfig {
 			key: endowed_accounts[0].clone(),
+			_genesis_phantom_data: Default::default(),
 		}),
 	}
 }
@@ -175,6 +186,7 @@ pub fn testnet_genesis(
 		consensus: Some(ConsensusConfig {
 			code: include_bytes!("../../runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm").to_vec(),
 			authorities: initial_authorities.clone(),
+			_genesis_phantom_data: Default::default(),
 		}),
 		system: None,
 		balances: Some(BalancesConfig {
@@ -185,10 +197,12 @@ pub fn testnet_genesis(
 			creation_fee: 0,
 			reclaim_rebate: 0,
 			balances: endowed_accounts.iter().map(|&k| (k.into(), (1 << 60))).collect(),
+			_genesis_phantom_data: Default::default(),
 		}),
 		session: Some(SessionConfig {
 			validators: initial_authorities.iter().cloned().map(Into::into).collect(),
 			session_length: 10,
+			_genesis_phantom_data: Default::default(),
 		}),
 		staking: Some(StakingConfig {
 			current_era: 0,
@@ -202,11 +216,13 @@ pub fn testnet_genesis(
 			current_offline_slash: 0,
 			current_session_reward: 0,
 			offline_slash_grace: 0,
+			_genesis_phantom_data: Default::default(),
 		}),
 		democracy: Some(DemocracyConfig {
 			launch_period: 9,
 			voting_period: 18,
 			minimum_deposit: 10,
+			_genesis_phantom_data: Default::default(),
 		}),
 		council_seats: Some(CouncilSeatsConfig {
 			active_council: endowed_accounts.iter()
@@ -221,19 +237,23 @@ pub fn testnet_genesis(
 			term_duration: 1000000,
 			desired_seats: (endowed_accounts.len() - initial_authorities.len()) as u32,
 			inactive_grace_period: 1,
+			_genesis_phantom_data: Default::default(),
 		}),
 		council_voting: Some(CouncilVotingConfig {
 			cooloff_period: 75,
 			voting_period: 20,
+			_genesis_phantom_data: Default::default(),
 		}),
 		timestamp: Some(TimestampConfig {
 			period: 5,                    // 5 second block time.
+			_genesis_phantom_data: Default::default(),
 		}),
 		treasury: Some(TreasuryConfig {
 			proposal_bond: Permill::from_percent(5),
 			proposal_bond_minimum: 1_000_000,
 			spend_period: 12 * 60 * 24,
 			burn: Permill::from_percent(50),
+			_genesis_phantom_data: Default::default(),
 		}),
 		contract: Some(ContractConfig {
 			contract_fee: 21,
@@ -243,9 +263,11 @@ pub fn testnet_genesis(
 			max_depth: 1024,
 			block_gas_limit: 10_000_000,
 			current_schedule: Default::default(),
+			_genesis_phantom_data: Default::default(),
 		}),
 		upgrade_key: Some(UpgradeKeyConfig {
 			key: upgrade_key,
+			_genesis_phantom_data: Default::default(),
 		}),
 	}
 }
@@ -289,7 +311,7 @@ mod tests {
 
 	fn local_testnet_genesis_instant() -> GenesisConfig {
 		let mut genesis = local_testnet_genesis();
-		genesis.timestamp = Some(TimestampConfig { period: 0 });
+		genesis.timestamp = Some(TimestampConfig { period: 0, _genesis_phantom_data: Default::default() });
 		genesis
 	}
 
diff --git a/substrate/node/cli/src/service.rs b/substrate/node/cli/src/service.rs
index 5a5edb89b0..b232beb538 100644
--- a/substrate/node/cli/src/service.rs
+++ b/substrate/node/cli/src/service.rs
@@ -28,7 +28,7 @@ use substrate_service::{
 	Roles, TaskExecutor,
 };
 use node_executor;
-use consensus::{import_queue, start_aura, Config as AuraConfig, AuraImportQueue};
+use consensus::{import_queue, start_aura, Config as AuraConfig, AuraImportQueue, NothingExtra};
 use client;
 
 const AURA_SLOT_DURATION: u64 = 6;
@@ -79,17 +79,25 @@ construct_service_factory! {
 		},
 		LightService = LightComponents<Self>
 			{ |config, executor| <LightComponents<Factory>>::new(config, executor) },
-		FullImportQueue = AuraImportQueue<Self::Block, FullClient<Self>>
-			{ |config, client| Ok(import_queue(AuraConfig {
-						local_key: None,
-						slot_duration: 5
-					}, client)) },
-		LightImportQueue = AuraImportQueue<Self::Block, LightClient<Self>>
-			{ |config, client| Ok(
-				import_queue(AuraConfig {
+		FullImportQueue = AuraImportQueue<Self::Block, FullClient<Self>, NothingExtra>
+			{ |config, client| Ok(import_queue(
+				AuraConfig {
 					local_key: None,
 					slot_duration: 5
-				}, client))
+				},
+				client,
+				NothingExtra,
+			))
+			},
+		LightImportQueue = AuraImportQueue<Self::Block, LightClient<Self>, NothingExtra>
+			{ |config, client| Ok(import_queue(
+				AuraConfig {
+					local_key: None,
+					slot_duration: 5
+				},
+				client,
+				NothingExtra,
+			))
 			},
 	}
 }
diff --git a/substrate/node/executor/Cargo.toml b/substrate/node/executor/Cargo.toml
index 6cbbb2f11e..4c8f5c1030 100644
--- a/substrate/node/executor/Cargo.toml
+++ b/substrate/node/executor/Cargo.toml
@@ -29,3 +29,6 @@ srml-timestamp = { path = "../../srml/timestamp" }
 srml-treasury = { path = "../../srml/treasury" }
 srml-contract = { path = "../../srml/contract" }
 wabt = "0.4"
+
+[features]
+benchmarks = []
diff --git a/substrate/node/executor/src/lib.rs b/substrate/node/executor/src/lib.rs
index 704f2d342f..d6fc59d7d7 100644
--- a/substrate/node/executor/src/lib.rs
+++ b/substrate/node/executor/src/lib.rs
@@ -17,10 +17,14 @@
 //! A `CodeExecutor` specialisation which uses natively compiled runtime when the wasm to be
 //! executed is equivalent to the natively compiled code.
 
+#![cfg_attr(feature = "benchmarks", feature(test))]
+
 extern crate node_runtime;
 #[macro_use] extern crate substrate_executor;
 #[cfg_attr(test, macro_use)] extern crate substrate_primitives as primitives;
 
+#[cfg(feature = "benchmarks")] extern crate test;
+
 #[cfg(test)] extern crate substrate_keyring as keyring;
 #[cfg(test)] extern crate sr_primitives as runtime_primitives;
 #[cfg(test)] extern crate srml_support as runtime_support;
@@ -230,10 +234,12 @@ mod tests {
 				transfer_fee: 0,
 				creation_fee: 0,
 				reclaim_rebate: 0,
+				_genesis_phantom_data: Default::default(),
 			}),
 			session: Some(SessionConfig {
 				session_length: 2,
 				validators: vec![One.to_raw_public().into(), Two.to_raw_public().into(), three],
+				_genesis_phantom_data: Default::default(),
 			}),
 			staking: Some(StakingConfig {
 				sessions_per_era: 2,
@@ -247,6 +253,7 @@ mod tests {
 				current_offline_slash: 0,
 				current_session_reward: 0,
 				offline_slash_grace: 0,
+				_genesis_phantom_data: Default::default(),
 			}),
 			democracy: Some(Default::default()),
 			council_seats: Some(Default::default()),
@@ -744,4 +751,19 @@ mod tests {
 
 		assert!(t.storage_changes_root(Default::default(), 0).is_some());
 	}
+
+	#[cfg(feature = "benchmarks")]
+	mod benches {
+		use super::*;
+		use test::Bencher;
+
+		#[bench]
+		fn wasm_execute_block(b: &mut Bencher) {
+			b.iter(|| {
+				let mut t = new_test_ext(false);
+				WasmExecutor::new().call(&mut t, 8, COMPACT_CODE, "execute_block", &block1(false).0).unwrap();
+				WasmExecutor::new().call(&mut t, 8, COMPACT_CODE, "execute_block", &block2().0).unwrap();
+			});
+		}
+	}
 }
diff --git a/substrate/node/runtime/wasm/Cargo.lock b/substrate/node/runtime/wasm/Cargo.lock
index d340628488..3a032be99a 100644
--- a/substrate/node/runtime/wasm/Cargo.lock
+++ b/substrate/node/runtime/wasm/Cargo.lock
@@ -472,11 +472,6 @@ dependencies = [
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nan-preserving-float"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "net2"
 version = "0.2.33"
@@ -939,7 +934,7 @@ dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1270,7 +1265,7 @@ dependencies = [
  "substrate-serializer 0.1.0",
  "substrate-state-machine 0.1.0",
  "substrate-trie 0.4.0",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1316,7 +1311,7 @@ dependencies = [
  "twox-hash 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.5.0-beta.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1659,12 +1654,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "wasmi"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory_units 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1787,7 +1781,6 @@ dependencies = [
 "checksum mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "46e73a04c2fa6250b8d802134d56d554a9ec2922bf977777c805ea5def61ce40"
 "checksum mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "966257a94e196b11bb43aca423754d87429960a768de9414f3691d6957abf125"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
-"checksum nan-preserving-float 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34d4f00fcc2f4c9efa8cc971db0da9e28290e28e97af47585e48691ef10ff31f"
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
 "checksum nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
 "checksum num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "e83d528d2677f0518c570baf2b7abdcf0cd2d248860b68507bdcb3e91d4c0cea"
@@ -1868,7 +1861,7 @@ dependencies = [
 "checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-"checksum wasmi 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d184c4b7081f30316f74f8d73c197314dcb56ea7af9323522b42a2fa9cb19453"
+"checksum wasmi 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8a60b9508cff2b7c27ed41200dd668806280740fadc8c88440e9c88625e84f1a"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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 b9cceb155a..c94b484d45 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/balances/src/mock.rs b/substrate/srml/balances/src/mock.rs
index 5fb6bb80dc..b3355636b3 100644
--- a/substrate/srml/balances/src/mock.rs
+++ b/substrate/srml/balances/src/mock.rs
@@ -104,6 +104,7 @@ impl ExtBuilder {
 			transfer_fee: self.transfer_fee,
 			creation_fee: self.creation_fee,
 			reclaim_rebate: 0,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.into()
 	}
diff --git a/substrate/srml/consensus/src/mock.rs b/substrate/srml/consensus/src/mock.rs
index e3a13d4597..88eb669a84 100644
--- a/substrate/srml/consensus/src/mock.rs
+++ b/substrate/srml/consensus/src/mock.rs
@@ -54,6 +54,7 @@ pub fn new_test_ext(authorities: Vec<u64>) -> runtime_io::TestExternalities<Blak
 	t.extend(GenesisConfig::<Test>{
 		code: vec![],
 		authorities,
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.into()
 }
diff --git a/substrate/srml/contract/src/tests.rs b/substrate/srml/contract/src/tests.rs
index 27d6e59a95..db339ecde1 100644
--- a/substrate/srml/contract/src/tests.rs
+++ b/substrate/srml/contract/src/tests.rs
@@ -131,6 +131,7 @@ impl ExtBuilder {
 				transfer_fee: self.transfer_fee,
 				creation_fee: self.creation_fee,
 				reclaim_rebate: 0,
+				_genesis_phantom_data: Default::default(),
 			}.build_storage()
 			.unwrap().0,
 		);
@@ -143,6 +144,7 @@ impl ExtBuilder {
 				max_depth: 100,
 				block_gas_limit: self.block_gas_limit,
 				current_schedule: Default::default(),
+				_genesis_phantom_data: Default::default(),
 			}.build_storage()
 			.unwrap().0,
 		);
diff --git a/substrate/srml/council/src/lib.rs b/substrate/srml/council/src/lib.rs
index 26d88c6c7b..2ea0def3a5 100644
--- a/substrate/srml/council/src/lib.rs
+++ b/substrate/srml/council/src/lib.rs
@@ -122,11 +122,13 @@ mod tests {
 			transfer_fee: 0,
 			creation_fee: 0,
 			reclaim_rebate: 0,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(democracy::GenesisConfig::<Test>{
 			launch_period: 1,
 			voting_period: 3,
 			minimum_deposit: 1,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(seats::GenesisConfig::<Test> {
 			candidacy_bond: 9,
@@ -143,10 +145,12 @@ mod tests {
 			presentation_duration: 2,
 			desired_seats: 2,
 			term_duration: 5,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(voting::GenesisConfig::<Test> {
 			cooloff_period: 2,
 			voting_period: 1,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		runtime_io::TestExternalities::new(t)
 	}
diff --git a/substrate/srml/democracy/src/lib.rs b/substrate/srml/democracy/src/lib.rs
index 0c589d5893..d2d2b6e4f9 100644
--- a/substrate/srml/democracy/src/lib.rs
+++ b/substrate/srml/democracy/src/lib.rs
@@ -358,11 +358,13 @@ mod tests {
 			transfer_fee: 0,
 			creation_fee: 0,
 			reclaim_rebate: 0,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(GenesisConfig::<Test>{
 			launch_period: 1,
 			voting_period: 1,
 			minimum_deposit: 1,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		runtime_io::TestExternalities::new(t)
 	}
diff --git a/substrate/srml/example/src/lib.rs b/substrate/srml/example/src/lib.rs
index 8dcbb7094b..9ad2f6fdb8 100644
--- a/substrate/srml/example/src/lib.rs
+++ b/substrate/srml/example/src/lib.rs
@@ -313,6 +313,7 @@ mod tests {
 		t.extend(GenesisConfig::<Test>{
 			dummy: 42,
 			foo: 24,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.into()
 	}
diff --git a/substrate/srml/executive/src/lib.rs b/substrate/srml/executive/src/lib.rs
index 005b8508db..c5aded4a68 100644
--- a/substrate/srml/executive/src/lib.rs
+++ b/substrate/srml/executive/src/lib.rs
@@ -327,6 +327,7 @@ mod tests {
 			transfer_fee: 0,
 			creation_fee: 0,
 			reclaim_rebate: 0,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		let xt = primitives::testing::TestXt(Some(1), 0, Call::transfer(2.into(), 69.into()));
 		let mut t = runtime_io::TestExternalities::<Blake2Hasher>::new(t);
diff --git a/substrate/srml/session/src/lib.rs b/substrate/srml/session/src/lib.rs
index 99bf182cf8..33ac3dbabf 100644
--- a/substrate/srml/session/src/lib.rs
+++ b/substrate/srml/session/src/lib.rs
@@ -270,13 +270,16 @@ mod tests {
 		t.extend(consensus::GenesisConfig::<Test>{
 			code: vec![],
 			authorities: vec![1, 2, 3],
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(timestamp::GenesisConfig::<Test>{
 			period: 5,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(GenesisConfig::<Test>{
 			session_length: 2,
 			validators: vec![1, 2, 3],
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		runtime_io::TestExternalities::new(t)
 	}
diff --git a/substrate/srml/staking/src/mock.rs b/substrate/srml/staking/src/mock.rs
index b22af1b1b5..bfef4653a6 100644
--- a/substrate/srml/staking/src/mock.rs
+++ b/substrate/srml/staking/src/mock.rs
@@ -88,10 +88,12 @@ pub fn new_test_ext(
 	t.extend(consensus::GenesisConfig::<Test>{
 		code: vec![],
 		authorities: vec![],
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(session::GenesisConfig::<Test>{
 		session_length,
 		validators: vec![10, 20],
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(balances::GenesisConfig::<Test>{
 		balances: if monied {
@@ -109,6 +111,7 @@ pub fn new_test_ext(
 		transfer_fee: 0,
 		creation_fee: 0,
 		reclaim_rebate: 0,
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(GenesisConfig::<Test>{
 		sessions_per_era,
@@ -122,9 +125,11 @@ pub fn new_test_ext(
 		current_session_reward: reward,
 		current_offline_slash: 20,
 		offline_slash_grace: 0,
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(timestamp::GenesisConfig::<Test>{
-		period: 5
+		period: 5,
+		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	runtime_io::TestExternalities::new(t)
 }
diff --git a/substrate/srml/support/src/storage/generator.rs b/substrate/srml/support/src/storage/generator.rs
index 31d583d6c9..60e26e8aee 100644
--- a/substrate/srml/support/src/storage/generator.rs
+++ b/substrate/srml/support/src/storage/generator.rs
@@ -627,6 +627,8 @@ macro_rules! __generate_genesis_config {
 		#[serde(rename_all = "camelCase")]
 		#[serde(deny_unknown_fields)]
 		pub struct GenesisConfig<$traitinstance: $traittype> {
+			#[serde(skip)]
+			pub _genesis_phantom_data: $crate::storage::generator::PhantomData<$traitinstance>,
 			$(pub $fieldname : $fieldtype ,)*
 			$( $(#[$attr])* pub $extrafieldname : $extrafieldty ,)*
 		}
@@ -635,6 +637,7 @@ macro_rules! __generate_genesis_config {
 		impl<$traitinstance: $traittype> Default for GenesisConfig<$traitinstance> {
 			fn default() -> Self {
 				GenesisConfig {
+					_genesis_phantom_data: Default::default(),
 					$($fieldname : $fielddefault ,)*
 					$($extrafieldname : $extrafielddefault ,)*
 				}
diff --git a/substrate/srml/system/src/lib.rs b/substrate/srml/system/src/lib.rs
index c3cffda04f..666348254f 100644
--- a/substrate/srml/system/src/lib.rs
+++ b/substrate/srml/system/src/lib.rs
@@ -201,7 +201,6 @@ decl_storage! {
 	}
 	add_extra_genesis {
 		config(changes_trie_config): Option<ChangesTrieConfiguration>;
-		config(_phantom): ::std::marker::PhantomData<T>;
 
 		build(|storage: &mut primitives::StorageMap, _: &mut primitives::ChildrenStorageMap, config: &GenesisConfig<T>| {
 			use codec::Encode;
diff --git a/substrate/srml/timestamp/src/lib.rs b/substrate/srml/timestamp/src/lib.rs
index 35c82b532f..db1e2934db 100644
--- a/substrate/srml/timestamp/src/lib.rs
+++ b/substrate/srml/timestamp/src/lib.rs
@@ -211,7 +211,10 @@ mod tests {
 	#[test]
 	fn timestamp_works() {
 		let mut t = system::GenesisConfig::<Test>::default().build_storage().unwrap().0;
-		t.extend(GenesisConfig::<Test> { period: 0 }.build_storage().unwrap().0);
+		t.extend(GenesisConfig::<Test> {
+			period: 5,
+			_genesis_phantom_data: Default::default()
+		}.build_storage().unwrap().0);
 
 		with_externalities(&mut TestExternalities::new(t), || {
 			Timestamp::set_timestamp(42);
@@ -224,7 +227,10 @@ mod tests {
 	#[should_panic(expected = "Timestamp must be updated only once in the block")]
 	fn double_timestamp_should_fail() {
 		let mut t = system::GenesisConfig::<Test>::default().build_storage().unwrap().0;
-		t.extend(GenesisConfig::<Test> { period: 5 }.build_storage().unwrap().0);
+		t.extend(GenesisConfig::<Test> {
+			period: 5,
+			_genesis_phantom_data: Default::default()
+		}.build_storage().unwrap().0);
 
 		with_externalities(&mut TestExternalities::new(t), || {
 			Timestamp::set_timestamp(42);
@@ -237,7 +243,10 @@ mod tests {
 	#[should_panic(expected = "Timestamp must increment by at least <BlockPeriod> between sequential blocks")]
 	fn block_period_is_enforced() {
 		let mut t = system::GenesisConfig::<Test>::default().build_storage().unwrap().0;
-		t.extend(GenesisConfig::<Test> { period: 5 }.build_storage().unwrap().0);
+		t.extend(GenesisConfig::<Test> {
+			period: 5,
+			_genesis_phantom_data: Default::default()
+		}.build_storage().unwrap().0);
 
 		with_externalities(&mut TestExternalities::new(t), || {
 			Timestamp::set_timestamp(42);
diff --git a/substrate/srml/treasury/src/lib.rs b/substrate/srml/treasury/src/lib.rs
index 340ab48a8c..2ec3deffce 100644
--- a/substrate/srml/treasury/src/lib.rs
+++ b/substrate/srml/treasury/src/lib.rs
@@ -330,12 +330,14 @@ mod tests {
 			creation_fee: 0,
 			existential_deposit: 0,
 			reclaim_rebate: 0,
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(GenesisConfig::<Test>{
 			proposal_bond: Permill::from_percent(5),
 			proposal_bond_minimum: 1,
 			spend_period: 2,
 			burn: Permill::from_percent(50),
+			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.into()
 	}