diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 06862bcea..67eb80cf4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -165,8 +165,6 @@ build-darwin:
   variables:
     CARGO_TARGET:                  x86_64-apple-darwin
     CARGO_HOME:                    "${CI_PROJECT_DIR}/.cargo"
-    CC:                            gcc
-    CXX:                           g++
   script:
     - scripts/gitlab/build-linux.sh
   tags:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a4d892c5..d0602fa43 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,25 @@
+## Parity-Ethereum [v2.7.1](https://github.com/paritytech/parity-ethereum/releases/tag/v2.7.1)
+Parity Ethereum v2.7.2-stable is a patch version release of parity-ethereum. 
+Starting in the 2.7.x series of releases, parity-ethereum is switching to a single `stable` release
+track. As a result, any clients that currently receive updates from the `beta`
+track should switch to the `stable` track.
+Due to database format changes, upgrading from 2.5.x or 2.6.x is one-way only. 
+
+The full list of included changes:
+
+* backwards compatible call_type creation_method (#11450 + #11455) 
+* chore: remove unused dependencies (#11432)
+* Cargo.lock: new lockfile format (#11448)
+* rlp_derive: cleanup (#11446)
+* Avoid long state queries when serving GetNodeData requests (#11444)
+* update kvdb-rocksdb to 0.4 (#11442)
+* Remove dead bootnodes, add new geth bootnodes (#11441)
+* goerli: replace foundation bootnode (#11433)
+* fix: export hardcoded sync format (#11416)
+* verification: fix race same block + misc (#11400)
+* update classic testnet bootnodes (#11398)
+* gcc to clang (#11453) 
+
 ## Parity-Ethereum [v2.7.1](https://github.com/paritytech/parity-ethereum/releases/tag/v2.7.1)
 Parity Ethereum v2.7.1-stable is a patch version release of parity-ethereum. 
 Starting in the 2.7.x series of releases, parity-ethereum is switching to a single `stable` release
diff --git a/Cargo.lock b/Cargo.lock
index 7c7c375c8..ec444f4dc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,424 +4,455 @@
 name = "account-db"
 version = "0.1.0"
 dependencies = [
- "ethereum-types 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hash-db 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "keccak-hash 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethereum-types",
+ "hash-db",
+ "keccak-hash",
  "keccak-hasher 0.1.1",
- "kvdb 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rlp 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb",
+ "rlp",
 ]
 
 [[package]]
 name = "account-state"
 version = "0.1.0"
 dependencies = [
- "account-db 0.1.0",
- "common-types 0.1.0",
- "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethereum-types 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hash-db 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "journaldb 0.2.0",
- "keccak-hash 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "account-db",
+ "common-types",
+ "derive_more 0.15.0",
+ "ethereum-types",
+ "hash-db",
+ "journaldb",
+ "keccak-hash",
  "keccak-hasher 0.1.1",
- "kvdb 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
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- "parity-util-mem 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie-ethereum 0.1.0",
- "pod 0.1.0",
- "rlp 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "rlp_compress 0.1.0",
- "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
- "trace 0.1.0",
- "trie-db 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "trie-vm-factories 0.1.0",
+ "kvdb",
+ "log",
+ "lru-cache",
+ "memory-db",
+ "parity-bytes",
+ "parity-util-mem 0.3.0",
+ "parking_lot 0.9.0",
+ "patricia-trie-ethereum",
+ "pod",
+ "rlp",
+ "rlp_compress",
+ "serde",
+ "trie-db",
+ "trie-vm-factories",
 ]
 
 [[package]]
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+checksum = "54eb1d8fe354e5fc611daf4f2ea97dd45a765f4f1e4512306ec183ae2e8f20c9"
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- "block-cipher-trait 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aes-soft",
+ "aesni",
+ "block-cipher-trait",
 ]
 
 [[package]]
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+checksum = "d2e5b0458ea3beae0d1d8c0f3946564f8e10f90646cf78c06b4351052058d1ee"
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- "ctr 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "stream-cipher 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aes-soft",
+ "aesni",
+ "ctr",
+ "stream-cipher",
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 [[package]]
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+ "block-cipher-trait",
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- "stream-cipher 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+checksum = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
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- "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 dependencies = [
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8",
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 [[package]]
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+checksum = "7825f6833612eb2414095684fcf6c635becf3ce97fe48cf6421321e93bfbd53c"
 
 [[package]]
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- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "xdg 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+checksum = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 
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 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
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+checksum = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
 
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- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
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- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "winapi 0.3.8",
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+ "keccak-hash",
+ "lazy_static",
+ "log",
+ "lru-cache",
+ "machine",
+ "macros",
+ "parity-bytes",
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+ "parking_lot 0.9.0",
+ "rand 0.7.2",
+ "rlp",
+ "serde_json",
+ "spec",
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+ "time-utils",
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 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "client-traits",
+ "common-types",
+ "engine",
+ "ethcore",
+ "ethcore-accounts",
+ "ethereum-types",
+ "ethjson",
+ "keccak-hash",
+ "log",
+ "machine",
+ "parity-crypto",
+ "parking_lot 0.9.0",
+ "rlp",
+ "spec",
+ "tempdir",
+ "validator-set",
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 [[package]]
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- "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "cfg-if",
+ "clang-sys",
+ "clap",
+ "env_logger 0.6.2",
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-"checksum webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d7e664e770ac0110e2384769bcc59ed19e329d81f555916a6e072714957b81b4"
-"checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
-"checksum which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b57acb10231b9493c8472b20cb57317d0679a49e0bdbee44b3b803a6473af164"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "afc5508759c5bf4285e61feb862b6083c8480aec864fa17a81fdec6f69b461ab"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
-"checksum ws 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8a6f5bb86663ff4d1639408410f50bf6050367a8525d644d49a6894cd618a631"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
-"checksum xdg 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a66b7c2281ebde13cf4391d70d4c7e5946c3c25e72a7b859ca8f677dcd0b0c61"
-"checksum xml-rs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c1cb601d29fe2c2ac60a2b2e5e293994d87a1f6fa9687a31a15270f909be9c2"
-"checksum xmltree 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff8eaee9d17062850f1e6163b509947969242990ee59a35801af437abe041e70"
-"checksum zeroize 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "45af6a010d13e4cf5b54c94ba5a2b2eba5596b9e46bf5875612d332a1f2b3f86"
-"checksum zeroize_derive 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "080616bd0e31f36095288bb0acdf1f78ef02c2fa15527d7e993f2a6c7591643e"
diff --git a/Cargo.toml b/Cargo.toml
index 8a2f22d69..ea9adb20a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 description = "Parity Ethereum client"
 name = "parity-ethereum"
 # NOTE Make sure to update util/version/Cargo.toml as well
-version = "2.7.1"
+version = "2.7.2"
 license = "GPL-3.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
@@ -41,8 +41,8 @@ futures = "0.1"
 journaldb = { path = "util/journaldb" }
 jsonrpc-core = "14.0.3"
 keccak-hash = "0.4.0"
-kvdb = "0.2"
-kvdb-rocksdb = "0.3.0"
+kvdb = "0.3.1"
+kvdb-rocksdb = "0.4.1"
 log = "0.4"
 migration-rocksdb = { path = "util/migration-rocksdb" }
 node-filter = { path = "ethcore/node-filter" }
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index 9d9f574c1..c4cc43f37 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -31,9 +31,9 @@ hash-db = "0.15.0"
 itertools = "0.5"
 journaldb = { path = "../util/journaldb" }
 keccak-hash = "0.4.0"
-kvdb = "0.2"
-kvdb-memorydb = { version = "0.2.0", optional = true }
-kvdb-rocksdb = { version = "0.3.0", optional = true }
+kvdb = "0.3.1"
+kvdb-memorydb = { version = "0.3.1", optional = true }
+kvdb-rocksdb = { version = "0.4.1", optional = true }
 lazy_static = { version = "1.3", optional = true }
 log = "0.4"
 macros = { path = "../util/macros", optional = true }
@@ -78,8 +78,8 @@ ethcore-builtin = { path = "./builtin" }
 ethjson = { path = "../json", features = ["test-helpers"] }
 parity-crypto = { version = "0.4.2", features = ["publickey"] }
 fetch = { path = "../util/fetch" }
-kvdb-memorydb = "0.2.0"
-kvdb-rocksdb = "0.3.0"
+kvdb-memorydb = "0.3.1"
+kvdb-rocksdb = "0.4.1"
 lazy_static = "1.3"
 machine = { path = "./machine", features = ["test-helpers"] }
 macros = { path = "../util/macros" }
diff --git a/ethcore/account-db/Cargo.toml b/ethcore/account-db/Cargo.toml
index a0a12136d..a32d50e32 100644
--- a/ethcore/account-db/Cargo.toml
+++ b/ethcore/account-db/Cargo.toml
@@ -11,5 +11,5 @@ ethereum-types = "0.8.0"
 hash-db = "0.15.0"
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 rlp = "0.4"
diff --git a/ethcore/account-state/Cargo.toml b/ethcore/account-state/Cargo.toml
index 9dc01cadd..6d0aee0f0 100644
--- a/ethcore/account-state/Cargo.toml
+++ b/ethcore/account-state/Cargo.toml
@@ -16,7 +16,7 @@ hash-db = "0.15.0"
 journaldb = { path = "../../util/journaldb" }
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 lru-cache = "0.1.2"
 memory-db = "0.18.0"
@@ -26,7 +26,6 @@ parking_lot = "0.9"
 pod = { path = "../pod" }
 rlp = "0.4.0"
 serde = { version = "1.0", features = ["derive"] }
-trace = { path = "../trace" }
 trie-db = "0.18.0"
 
 [dev-dependencies]
diff --git a/ethcore/blockchain/Cargo.toml b/ethcore/blockchain/Cargo.toml
index 6e9b22755..ad4dd2741 100644
--- a/ethcore/blockchain/Cargo.toml
+++ b/ethcore/blockchain/Cargo.toml
@@ -16,7 +16,7 @@ ethereum-types = "0.8.0"
 keccak-hash = "0.4.0"
 parity-util-mem = "0.3.0"
 itertools = "0.5"
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 parity-bytes = "0.1"
 rand = "0.7"
@@ -32,4 +32,4 @@ env_logger = "0.5"
 parity-crypto = { version = "0.4.2", features = ["publickey"] }
 rustc-hex = "1.0"
 tempdir = "0.3"
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
diff --git a/ethcore/builtin/Cargo.toml b/ethcore/builtin/Cargo.toml
index d36a3e762..0ce7f315e 100644
--- a/ethcore/builtin/Cargo.toml
+++ b/ethcore/builtin/Cargo.toml
@@ -14,10 +14,10 @@ ethereum-types = "0.8.0"
 ethjson = { path = "../../json" }
 keccak-hash = "0.4.0"
 log = "0.4"
-macros = { path = "../../util/macros" }
 num = { version = "0.1", default-features = false, features = ["bigint"] }
 parity-bytes = "0.1"
 parity-crypto = { version = "0.4.2", features = ["publickey"] }
 
 [dev-dependencies]
 hex-literal = "0.2.1"
+macros = { path = "../../util/macros" }
diff --git a/ethcore/client-traits/Cargo.toml b/ethcore/client-traits/Cargo.toml
index ceeb331e7..e89153939 100644
--- a/ethcore/client-traits/Cargo.toml
+++ b/ethcore/client-traits/Cargo.toml
@@ -15,7 +15,7 @@ common-types = { path = "../types" }
 ethcore-db = { path = "../db" }
 ethcore-miner = { path = "../../miner" }
 ethereum-types = "0.8.0"
-kvdb = "0.2"
+kvdb = "0.3.1"
 registrar = { path = "../../util/registrar" }
 stats = { path = "../../util/stats" }
 trace = { path = "../trace" }
diff --git a/ethcore/db/Cargo.toml b/ethcore/db/Cargo.toml
index 201422e3f..af1eb9e9b 100644
--- a/ethcore/db/Cargo.toml
+++ b/ethcore/db/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 [dependencies]
 common-types = { path = "../types" }
 ethereum-types = "0.8.0"
-kvdb = "0.2"
+kvdb = "0.3.1"
 parity-util-mem = "0.3.0"
 parking_lot = "0.9"
 rlp = "0.4.0"
diff --git a/ethcore/engine/src/engine.rs b/ethcore/engine/src/engine.rs
index 5159c1222..3fa13a074 100644
--- a/ethcore/engine/src/engine.rs
+++ b/ethcore/engine/src/engine.rs
@@ -42,7 +42,7 @@ use machine::{
 	Machine,
 	executed_block::ExecutedBlock,
 };
-use vm::{EnvInfo, Schedule, CallType, ActionValue};
+use vm::{EnvInfo, Schedule, ActionType, ActionValue};
 
 use crate::signer::EngineSigner;
 
@@ -82,7 +82,7 @@ pub fn default_system_or_code_call<'a>(machine: &'a Machine, block: &'a mut Exec
 					Some(ActionValue::Apparent(U256::zero())),
 					U256::max_value(),
 					Some(data),
-					Some(CallType::StaticCall),
+					Some(ActionType::StaticCall),
 				)
 			},
 		};
diff --git a/ethcore/engines/validator-set/Cargo.toml b/ethcore/engines/validator-set/Cargo.toml
index 8840e61a0..bd63c380d 100644
--- a/ethcore/engines/validator-set/Cargo.toml
+++ b/ethcore/engines/validator-set/Cargo.toml
@@ -17,7 +17,7 @@ ethereum-types = "0.8.0"
 ethjson = { path = "../../../json" }
 executive-state = { path = "../../executive-state" }
 keccak-hash = "0.4.0"
-kvdb = "0.2"
+kvdb = "0.3.1"
 lazy_static = "1.3.0"
 log = "0.4.8"
 machine = { path = "../../machine" }
diff --git a/ethcore/evm/src/interpreter/mod.rs b/ethcore/evm/src/interpreter/mod.rs
index fded2ac7f..799566eeb 100644
--- a/ethcore/evm/src/interpreter/mod.rs
+++ b/ethcore/evm/src/interpreter/mod.rs
@@ -33,7 +33,7 @@ use ethereum_types::{U256, U512, H256, Address, BigEndianHash};
 
 
 use vm::{
-	self, ActionParams, ParamsType, ActionValue, CallType, MessageCallResult,
+	self, ActionParams, ParamsType, ActionValue, ActionType, MessageCallResult,
 	ContractCreateResult, CreateContractAddress, ReturnData, GasLeft, Schedule,
 	TrapKind, TrapError
 };
@@ -133,8 +133,8 @@ struct InterpreterParams {
 	pub value: ActionValue,
 	/// Input data.
 	pub data: Option<Bytes>,
-	/// Type of call
-	pub call_type: CallType,
+	/// Type of action
+	pub action_type: ActionType,
 	/// Param types encoding
 	pub params_type: ParamsType,
 }
@@ -152,7 +152,7 @@ impl From<ActionParams> for InterpreterParams {
 			gas_price: params.gas_price,
 			value: params.value,
 			data: params.data,
-			call_type: params.call_type,
+			action_type: params.action_type,
 			params_type: params.params_type,
 		}
 	}
@@ -532,7 +532,9 @@ impl<Cost: CostType> Interpreter<Cost> {
 				let init_size = self.stack.pop_back();
 				let address_scheme = match instruction {
 					instructions::CREATE => CreateContractAddress::FromSenderAndNonce,
-					instructions::CREATE2 => CreateContractAddress::FromSenderSaltAndCodeHash(BigEndianHash::from_uint(&self.stack.pop_back())),
+					instructions::CREATE2 => CreateContractAddress::FromSenderSaltAndCodeHash(
+						BigEndianHash::from_uint(&self.stack.pop_back())
+					),
 					_ => unreachable!("instruction can only be CREATE/CREATE2 checked above; qed"),
 				};
 
@@ -553,7 +555,14 @@ impl<Cost: CostType> Interpreter<Cost> {
 
 				let contract_code = self.mem.read_slice(init_off, init_size);
 
-				let create_result = ext.create(&create_gas.as_u256(), &endowment, contract_code, &self.params.code_version, address_scheme, true);
+				let create_result = ext.create(
+					&create_gas.as_u256(), 
+					&endowment, 
+					contract_code, 
+					&self.params.code_version, 
+					address_scheme, 
+					true,
+				);
 				return match create_result {
 					Ok(ContractCreateResult::Created(address, gas_left)) => {
 						self.stack.push(address_to_u256(address));
@@ -607,14 +616,14 @@ impl<Cost: CostType> Interpreter<Cost> {
 							return Err(vm::Error::MutableCallInStaticContext);
 						}
 						let has_balance = ext.balance(&self.params.address)? >= value.expect("value set for all but delegate call; qed");
-						(&self.params.address, &code_address, has_balance, CallType::Call)
+						(&self.params.address, &code_address, has_balance, ActionType::Call)
 					},
 					instructions::CALLCODE => {
 						let has_balance = ext.balance(&self.params.address)? >= value.expect("value set for all but delegate call; qed");
-						(&self.params.address, &self.params.address, has_balance, CallType::CallCode)
+						(&self.params.address, &self.params.address, has_balance, ActionType::CallCode)
 					},
-					instructions::DELEGATECALL => (&self.params.sender, &self.params.address, true, CallType::DelegateCall),
-					instructions::STATICCALL => (&self.params.address, &code_address, true, CallType::StaticCall),
+					instructions::DELEGATECALL => (&self.params.sender, &self.params.address, true, ActionType::DelegateCall),
+					instructions::STATICCALL => (&self.params.address, &code_address, true, ActionType::StaticCall),
 					_ => panic!(format!("Unexpected instruction {:?} in CALL branch.", instruction))
 				};
 
diff --git a/ethcore/evm/src/lib.rs b/ethcore/evm/src/lib.rs
index 1dff2165c..2a1fd3949 100644
--- a/ethcore/evm/src/lib.rs
+++ b/ethcore/evm/src/lib.rs
@@ -47,7 +47,7 @@ mod instructions;
 mod tests;
 
 pub use vm::{
-    Schedule, CleanDustMode, EnvInfo, CallType, ActionParams, Ext,
+    Schedule, CleanDustMode, EnvInfo, ActionType, ActionParams, Ext,
     ContractCreateResult, MessageCallResult, CreateContractAddress,
     GasLeft, ReturnData
 };
diff --git a/ethcore/executive-state/Cargo.toml b/ethcore/executive-state/Cargo.toml
index 83e90564e..0236c0a42 100644
--- a/ethcore/executive-state/Cargo.toml
+++ b/ethcore/executive-state/Cargo.toml
@@ -14,7 +14,7 @@ common-types = { path = "../types" }
 ethereum-types = "0.8.0"
 hash-db = "0.15.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4.8"
 machine = { path = "../machine" }
 trace = { path = "../trace" }
diff --git a/ethcore/executive-state/src/lib.rs b/ethcore/executive-state/src/lib.rs
index 52a9fae2c..a2f979b10 100644
--- a/ethcore/executive-state/src/lib.rs
+++ b/ethcore/executive-state/src/lib.rs
@@ -276,7 +276,6 @@ mod tests {
 		test_helpers::{get_temp_state, get_temp_state_db}
 	};
 	use ethtrie;
-	use evm::CallType;
 	use machine::Machine;
 	use pod::{self, PodAccount, PodState};
 	use rustc_hex::FromHex;
@@ -324,6 +323,7 @@ mod tests {
 				value: 100.into(),
 				gas: 77412.into(),
 				init: vec![96, 16, 128, 96, 12, 96, 0, 57, 96, 0, 243, 0, 96, 0, 53, 84, 21, 96, 9, 87, 0, 91, 96, 32, 53, 96, 0, 53, 85],
+				creation_method: Some(trace::CreationMethod::Create),
 			}),
 			result: trace::Res::Create(trace::CreateResult {
 				gas_used: U256::from(3224),
@@ -381,6 +381,7 @@ mod tests {
 				value: 100.into(),
 				gas: 78792.into(),
 				init: vec![91, 96, 0, 86],
+				creation_method: Some(trace::CreationMethod::Create),
 			}),
 			result: trace::Res::FailedCreate(TraceError::OutOfGas),
 			subtraces: 0
@@ -419,7 +420,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(3),
@@ -460,7 +461,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(0),
@@ -501,7 +502,7 @@ mod tests {
 				value: 0.into(),
 				gas: 79_000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(3000),
@@ -543,7 +544,7 @@ mod tests {
 				value: 0.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(3_721), // in post-eip150
@@ -587,7 +588,7 @@ mod tests {
 				value: 0.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: 724.into(), // in post-eip150
@@ -602,7 +603,7 @@ mod tests {
 				value: 0.into(),
 				gas: 4096.into(),
 				input: vec![],
-				call_type: CallType::CallCode,
+				call_type: Some(trace::CallType::CallCode).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: 3.into(),
@@ -646,7 +647,7 @@ mod tests {
 				value: 0.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(736), // in post-eip150
@@ -661,7 +662,7 @@ mod tests {
 				value: 0.into(),
 				gas: 32768.into(),
 				input: vec![],
-				call_type: CallType::DelegateCall,
+				call_type: Some(trace::CallType::DelegateCall).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: 18.into(),
@@ -702,7 +703,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::FailedCall(TraceError::OutOfGas),
 			subtraces: 0,
@@ -744,7 +745,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(69),
@@ -759,7 +760,7 @@ mod tests {
 				value: 0.into(),
 				gas: 78934.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(3),
@@ -801,7 +802,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(31761),
@@ -816,7 +817,7 @@ mod tests {
 				value: 69.into(),
 				gas: 2300.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult::default()),
 		}];
@@ -855,7 +856,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(31761),
@@ -898,7 +899,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(79_000),
@@ -913,7 +914,7 @@ mod tests {
 				value: 0.into(),
 				gas: 78934.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::FailedCall(TraceError::OutOfGas),
 		}];
@@ -954,7 +955,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(135),
@@ -969,7 +970,7 @@ mod tests {
 				value: 0.into(),
 				gas: 78934.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(69),
@@ -984,7 +985,7 @@ mod tests {
 				value: 0.into(),
 				gas: 78868.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(3),
@@ -1029,7 +1030,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(79_000),
@@ -1044,7 +1045,7 @@ mod tests {
 				value: 0.into(),
 				gas: 78934.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::FailedCall(TraceError::OutOfGas),
 		}, FlatTrace {
@@ -1055,7 +1056,7 @@ mod tests {
 				to: Address::from_low_u64_be(0xc),
 				value: 0.into(),
 				gas: 78868.into(),
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 				input: vec![],
 			}),
 			result: trace::Res::Call(trace::CallResult {
@@ -1099,7 +1100,7 @@ mod tests {
 				value: 100.into(),
 				gas: 79000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: 3.into(),
diff --git a/ethcore/light/Cargo.toml b/ethcore/light/Cargo.toml
index 6308bb31f..a2d4c8fac 100644
--- a/ethcore/light/Cargo.toml
+++ b/ethcore/light/Cargo.toml
@@ -43,14 +43,14 @@ stats = { path = "../../util/stats" }
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
 triehash-ethereum = { version = "0.2",  path = "../../util/triehash-ethereum" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 memory-cache = { path = "../../util/memory-cache" }
 journaldb = { path = "../../util/journaldb" }
 verification = { path = "../verification" }
 
 [dev-dependencies]
 ethcore = { path = "..", features = ["test-helpers"] }
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
 tempdir = "0.3"
 
 [features]
diff --git a/ethcore/light/src/client/mod.rs b/ethcore/light/src/client/mod.rs
index db5fa26b7..e835711e5 100644
--- a/ethcore/light/src/client/mod.rs
+++ b/ethcore/light/src/client/mod.rs
@@ -220,7 +220,7 @@ impl<T: ChainDataFetcher> Client<T> {
 
 	/// Import a header to the queue for additional verification.
 	pub fn import_header(&self, header: Header) -> EthcoreResult<H256> {
-		self.queue.import(header).map_err(|(_, e)| e)
+		self.queue.import(header).map_err(|(e, _)| e)
 	}
 
 	/// Inquire about the status of a given header.
diff --git a/ethcore/machine/src/executive.rs b/ethcore/machine/src/executive.rs
index f93231c0c..9307b0de1 100644
--- a/ethcore/machine/src/executive.rs
+++ b/ethcore/machine/src/executive.rs
@@ -26,7 +26,7 @@ use rlp::RlpStream;
 use log::trace;
 
 use account_state::{Backend as StateBackend, State, CleanupMode};
-use evm::{CallType, Finalize, FinalizationResult};
+use evm::{ActionType, Finalize, FinalizationResult};
 use vm::{
 	self, EnvInfo, CreateContractAddress, ReturnData, CleanDustMode, ActionParams,
 	ActionValue, Schedule, TrapError, ResumeCall, ResumeCreate
@@ -241,7 +241,7 @@ impl<'a> CallCreateExecutive<'a> {
 		trace!("Executive::call(params={:?}) self.env_info={:?}, parent_static={}", params, info, parent_static_flag);
 
 		let gas = params.gas;
-		let static_flag = parent_static_flag || params.call_type == CallType::StaticCall;
+		let static_flag = parent_static_flag || params.action_type == ActionType::StaticCall;
 
 		// if destination is builtin, try to execute it
 		let kind = if let Some(builtin) = machine.builtin(&params.code_address, info.number) {
@@ -298,7 +298,7 @@ impl<'a> CallCreateExecutive<'a> {
 			}
 		} else {
 			if (static_flag &&
-				(params.call_type == CallType::StaticCall || params.call_type == CallType::Call)) &&
+				(params.action_type == ActionType::StaticCall || params.action_type == ActionType::Call)) &&
 				params.value.value() > U256::zero()
 			{
 				return Err(vm::Error::MutableCallInStaticContext);
@@ -909,7 +909,7 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 					code: Some(Arc::new(t.data.clone())),
 					code_version: schedule.latest_version,
 					data: None,
-					call_type: CallType::None,
+					action_type: ActionType::Create,
 					params_type: vm::ParamsType::Embedded,
 				};
 				let res = self.create(params, &mut substate, &mut tracer, &mut vm_tracer);
@@ -932,7 +932,7 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 					code_hash: self.state.code_hash(address)?,
 					code_version: self.state.code_version(address)?,
 					data: Some(t.data.clone()),
-					call_type: CallType::Call,
+					action_type: ActionType::Call,
 					params_type: vm::ParamsType::Separate,
 				};
 				let res = self.call(params, &mut substate, &mut tracer, &mut vm_tracer);
@@ -1236,7 +1236,7 @@ mod tests {
 	use parity_crypto::publickey::{Generator, Random};
 	use evm::{Factory, evm_test, evm_test_ignore};
 	use macros::vec_into;
-	use vm::{ActionParams, ActionValue, CallType, EnvInfo, CreateContractAddress};
+	use vm::{ActionParams, ActionValue, EnvInfo, CreateContractAddress};
 	use ::trace::{
 		trace,
 		FlatTrace, Tracer, NoopTracer, ExecutiveTracer,
@@ -1414,7 +1414,7 @@ mod tests {
 		params.gas = U256::from(100_000);
 		params.code = Some(Arc::new(code));
 		params.value = ActionValue::Transfer(U256::from(100));
-		params.call_type = CallType::Call;
+		params.action_type = ActionType::Call;
 		let mut state = get_temp_state();
 		state.add_balance(&sender, &U256::from(100), CleanupMode::NoEmpty).unwrap();
 		let info = EnvInfo::default();
@@ -1434,7 +1434,7 @@ mod tests {
 				value: 100.into(),
 				gas: 100_000.into(),
 				input: vec![],
-				call_type: CallType::Call
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: 33021.into(),
@@ -1449,7 +1449,7 @@ mod tests {
 				value: 1.into(),
 				gas: 66560.into(),
 				input: vec![],
-				call_type: CallType::Call
+				call_type: Some(trace::CallType::Call).into(),
 			}), result: trace::Res::Call(trace::CallResult {
 				gas_used: 600.into(),
 				output: vec![0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 156, 17, 133, 165, 197, 233, 252, 84, 97, 40, 8, 151, 126, 232, 245, 72, 178, 37, 141, 49]
@@ -1498,7 +1498,7 @@ mod tests {
 		params.gas = U256::from(100_000);
 		params.code = Some(Arc::new(code));
 		params.value = ActionValue::Transfer(U256::from(100));
-		params.call_type = CallType::Call;
+		params.action_type = ActionType::Call;
 		let mut state = get_temp_state();
 		state.add_balance(&sender, &U256::from(100), CleanupMode::NoEmpty).unwrap();
 		let info = EnvInfo::default();
@@ -1524,7 +1524,7 @@ mod tests {
 				value: 100.into(),
 				gas: 100000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(55_248),
@@ -1537,7 +1537,8 @@ mod tests {
 				from: Address::from_str("b010143a42d5980c7e5ef0e4a4416dc098a4fed3").unwrap(),
 				value: 23.into(),
 				gas: 67979.into(),
-				init: vec![96, 16, 128, 96, 12, 96, 0, 57, 96, 0, 243, 0, 96, 0, 53, 84, 21, 96, 9, 87, 0, 91, 96, 32, 53, 96, 0, 53, 85]
+				init: vec![96, 16, 128, 96, 12, 96, 0, 57, 96, 0, 243, 0, 96, 0, 53, 84, 21, 96, 9, 87, 0, 91, 96, 32, 53, 96, 0, 53, 85],
+				creation_method: Some(trace::CreationMethod::Create),
 			}),
 			result: trace::Res::Create(trace::CreateResult {
 				gas_used: U256::from(3224),
@@ -1614,7 +1615,7 @@ mod tests {
 		params.gas = U256::from(100_000);
 		params.code = Some(Arc::new(code));
 		params.value = ActionValue::Transfer(U256::from(100));
-		params.call_type = CallType::Call;
+		params.action_type = ActionType::Call;
 		let mut state = get_temp_state();
 		state.add_balance(&sender, &U256::from(100), CleanupMode::NoEmpty).unwrap();
 		let info = EnvInfo::default();
@@ -1640,7 +1641,7 @@ mod tests {
 				value: 100.into(),
 				gas: 100_000.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(trace::CallType::Call).into(),
 			}),
 			result: trace::Res::Call(trace::CallResult {
 				gas_used: U256::from(37_033),
@@ -1653,7 +1654,8 @@ mod tests {
 				from: Address::from_str("b010143a42d5980c7e5ef0e4a4416dc098a4fed3").unwrap(),
 				value: 23.into(),
 				gas: 66_917.into(),
-				init: vec![0x60, 0x01, 0x60, 0x00, 0xfd]
+				init: vec![0x60, 0x01, 0x60, 0x00, 0xfd],
+				creation_method: Some(trace::CreationMethod::Create),
 			}),
 			result: trace::Res::FailedCreate(vm::Error::Reverted.into()),
 		}];
@@ -1711,6 +1713,7 @@ mod tests {
 				value: 100.into(),
 				gas: params.gas,
 				init: vec![96, 16, 128, 96, 12, 96, 0, 57, 96, 0, 243, 0, 96, 0, 53, 84, 21, 96, 9, 87, 0, 91, 96, 32, 53, 96, 0, 53, 85],
+				creation_method: Some(trace::CreationMethod::Create),
 			}),
 			result: trace::Res::Create(trace::CreateResult {
 				gas_used: U256::from(3224),
diff --git a/ethcore/machine/src/externalities.rs b/ethcore/machine/src/externalities.rs
index 1b8d3ca0d..0808ebed2 100644
--- a/ethcore/machine/src/externalities.rs
+++ b/ethcore/machine/src/externalities.rs
@@ -29,7 +29,7 @@ use common_types::{
 };
 use trace::{Tracer, VMTracer};
 use vm::{
-	self, ActionParams, ActionValue, EnvInfo, CallType, Schedule,
+	self, ActionParams, ActionValue, EnvInfo, ActionType, Schedule,
 	Ext, ContractCreateResult, MessageCallResult, CreateContractAddress,
 	ReturnData, TrapKind
 };
@@ -193,7 +193,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 				code_hash,
 				code_version,
 				data: Some(data.as_bytes().to_vec()),
-				call_type: CallType::Call,
+				action_type: ActionType::Call,
 				params_type: vm::ParamsType::Separate,
 			};
 
@@ -241,6 +241,12 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 			}
 		};
 
+		let create_type = match address_scheme {
+			CreateContractAddress::FromSenderAndNonce => ActionType::Create,
+			CreateContractAddress::FromSenderSaltAndCodeHash(_) => ActionType::Create2,
+			CreateContractAddress::FromSenderAndCodeHash => ActionType::Create2,
+		};
+
 		// prepare the params
 		let params = ActionParams {
 			code_address: address.clone(),
@@ -254,7 +260,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 			code_hash,
 			code_version: *parent_version,
 			data: None,
-			call_type: CallType::None,
+			action_type: create_type,
 			params_type: vm::ParamsType::Embedded,
 		};
 
@@ -285,7 +291,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 		value: Option<U256>,
 		data: &[u8],
 		code_address: &Address,
-		call_type: CallType,
+		call_type: ActionType,
 		trap: bool,
 	) -> ::std::result::Result<MessageCallResult, TrapKind> {
 		trace!(target: "externalities", "call");
@@ -311,7 +317,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 			code_hash,
 			code_version,
 			data: Some(data.to_vec()),
-			call_type,
+			action_type: call_type,
 			params_type: vm::ParamsType::Separate,
 		};
 
@@ -457,7 +463,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 mod tests {
 	use std::str::FromStr;
 	use ethereum_types::{U256, Address};
-	use evm::{EnvInfo, Ext, CallType};
+	use evm::{EnvInfo, Ext, ActionType};
 	use account_state::State;
 	use ethcore::test_helpers::get_temp_state;
 	use trace::{NoopTracer, NoopVMTracer};
@@ -591,7 +597,7 @@ mod tests {
 			Some("0000000000000000000000000000000000000000000000000000000000150000".parse::<U256>().unwrap()),
 			&[],
 			&Address::zero(),
-			CallType::Call,
+			ActionType::Call,
 			false,
 		).ok().unwrap();
 	}
diff --git a/ethcore/machine/src/machine.rs b/ethcore/machine/src/machine.rs
index 0c9a8a45a..43151d0a0 100644
--- a/ethcore/machine/src/machine.rs
+++ b/ethcore/machine/src/machine.rs
@@ -34,7 +34,7 @@ use common_types::{
 	errors::{EngineError, EthcoreError as Error},
 	transaction::{self, SYSTEM_ADDRESS, UNSIGNED_SENDER, UnverifiedTransaction, SignedTransaction},
 };
-use vm::{CallType, ActionParams, ActionValue, ParamsType};
+use vm::{ActionType, ActionParams, ActionValue, ParamsType};
 use vm::{EnvInfo, Schedule};
 
 use account_state::CleanupMode;
@@ -141,7 +141,7 @@ impl Machine {
 		value: Option<ActionValue>,
 		gas: U256,
 		data: Option<Vec<u8>>,
-		call_type: Option<CallType>,
+		action_type: Option<ActionType>,
 	) -> Result<Vec<u8>, Error> {
 		let env_info = {
 			let mut env_info = block.env_info();
@@ -163,7 +163,7 @@ impl Machine {
 			code_hash,
 			code_version: 0.into(),
 			data,
-			call_type: call_type.unwrap_or(CallType::Call),
+			action_type: action_type.unwrap_or(ActionType::Call),
 			params_type: ParamsType::Separate,
 		};
 		let schedule = self.schedule(env_info.number);
diff --git a/ethcore/node-filter/Cargo.toml b/ethcore/node-filter/Cargo.toml
index a619deb91..cc8430c43 100644
--- a/ethcore/node-filter/Cargo.toml
+++ b/ethcore/node-filter/Cargo.toml
@@ -22,7 +22,7 @@ lru-cache = "0.1"
 
 [dev-dependencies]
 ethcore = { path = "..", features = ["test-helpers"] }
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
 ethcore-io = { path = "../../util/io" }
 spec = { path = "../spec" }
 tempdir = "0.3"
diff --git a/ethcore/pod/Cargo.toml b/ethcore/pod/Cargo.toml
index 2602dbcd4..d3a25d17d 100644
--- a/ethcore/pod/Cargo.toml
+++ b/ethcore/pod/Cargo.toml
@@ -15,7 +15,7 @@ hash-db = "0.15.0"
 itertools = "0.8"
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 parity-bytes = "0.1.0"
 rlp = "0.4"
diff --git a/ethcore/private-tx/Cargo.toml b/ethcore/private-tx/Cargo.toml
index 2db031f3f..485e42fc6 100644
--- a/ethcore/private-tx/Cargo.toml
+++ b/ethcore/private-tx/Cargo.toml
@@ -26,7 +26,7 @@ parity-util-mem = "0.3.0"
 hash-db = "0.15.0"
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 machine = { path = "../machine" }
 journaldb = { path = "../../util/journaldb" }
diff --git a/ethcore/res/ethereum/foundation.json b/ethcore/res/ethereum/foundation.json
index ec864d6ed..ba988e5bf 100644
--- a/ethcore/res/ethereum/foundation.json
+++ b/ethcore/res/ethereum/foundation.json
@@ -4770,32 +4770,14 @@
 		"enode://4afb3a9137a88267c02651052cf6fb217931b8c78ee058bb86643542a4e2e0a8d24d47d871654e1b78a276c363f3c1bc89254a973b00adc359c9e9a48f140686@144.217.139.5:30303",
 		"enode://c16d390b32e6eb1c312849fe12601412313165df1a705757d671296f1ac8783c5cff09eab0118ac1f981d7148c85072f0f26407e5c68598f3ad49209fade404d@139.99.51.203:30303",
 		"enode://4faf867a2e5e740f9b874e7c7355afee58a2d1ace79f7b692f1d553a1134eddbeb5f9210dd14dc1b774a46fd5f063a8bc1fa90579e13d9d18d1f59bac4a4b16b@139.99.160.213:30303",
-		"enode://6a868ced2dec399c53f730261173638a93a40214cf299ccf4d42a76e3fa54701db410669e8006347a4b3a74fa090bb35af0320e4bc8d04cf5b7f582b1db285f5@163.172.131.191:30303",
-		"enode://66a483383882a518fcc59db6c017f9cd13c71261f13c8d7e67ed43adbbc82a932d88d2291f59be577e9425181fc08828dc916fdd053af935a9491edf9d6006ba@212.47.247.103:30303",
-		"enode://cd6611461840543d5b9c56fbf088736154c699c43973b3a1a32390cf27106f87e58a818a606ccb05f3866de95a4fe860786fea71bf891ea95f234480d3022aa3@163.172.157.114:30303",
-		"enode://1d1f7bcb159d308eb2f3d5e32dc5f8786d714ec696bb2f7e3d982f9bcd04c938c139432f13aadcaf5128304a8005e8606aebf5eebd9ec192a1471c13b5e31d49@138.201.223.35:30303",
-		"enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@52.16.188.185:30303",
-		"enode://3f1d12044546b76342d59d4a05532c14b85aa669704bfe1f864fe079415aa2c02d743e03218e57a33fb94523adb54032871a6c51b2cc5514cb7c7e35b3ed0a99@13.93.211.84:30303",
-		"enode://78de8a0916848093c73790ead81d1928bec737d565119932b98c6b100d944b7a95e94f847f689fc723399d2e31129d182f7ef3863f2b4c820abbf3ab2722344d@191.235.84.50:30303",
-		"enode://158f8aab45f6d19c6cbf4a089c2670541a8da11978a2f90dbf6a502a4a3bab80d288afdbeb7ec0ef6d92de563767f3b1ea9e8e334ca711e9f8e2df5a0385e8e6@13.75.154.138:30303",
-		"enode://1118980bf48b0a3640bdba04e0fe78b1add18e1cd99bf22d53daac1fd9972ad650df52176e7c7d89d1114cfef2bc23a2959aa54998a46afcf7d91809f0855082@52.74.57.123:30303",
-		"enode://979b7fa28feeb35a4741660a16076f1943202cb72b6af70d327f053e248bab9ba81760f39d0701ef1d8f89cc1fbd2cacba0710a12cd5314d5e0c9021aa3637f9@5.1.83.226:30303",
-		"enode://0cc5f5ffb5d9098c8b8c62325f3797f56509bff942704687b6530992ac706e2cb946b90a34f1f19548cd3c7baccbcaea354531e5983c7d1bc0dee16ce4b6440b@40.118.3.223:30305",
-		"enode://1c7a64d76c0334b0418c004af2f67c50e36a3be60b5e4790bdac0439d21603469a85fad36f2473c9a80eb043ae60936df905fa28f1ff614c3e5dc34f15dcd2dc@40.118.3.223:30308",
-		"enode://85c85d7143ae8bb96924f2b54f1b3e70d8c4d367af305325d30a61385a432f247d2c75c45c6b4a60335060d072d7f5b35dd1d4c45f76941f62a4f83b6e75daaf@40.118.3.223:30309",
-		"enode://de471bccee3d042261d52e9bff31458daecc406142b401d4cd848f677479f73104b9fdeb090af9583d3391b7f10cb2ba9e26865dd5fca4fcdc0fb1e3b723c786@54.94.239.50:30303",
-		"enode://4cd540b2c3292e17cff39922e864094bf8b0741fcc8c5dcea14957e389d7944c70278d872902e3d0345927f621547efa659013c400865485ab4bfa0c6596936f@138.201.144.135:30303",
-		"enode://01f76fa0561eca2b9a7e224378dd854278735f1449793c46ad0c4e79e8775d080c21dcc455be391e90a98153c3b05dcc8935c8440de7b56fe6d67251e33f4e3c@51.15.42.252:30303",
-		"enode://2c9059f05c352b29d559192fe6bca272d965c9f2290632a2cfda7f83da7d2634f3ec45ae3a72c54dd4204926fb8082dcf9686e0d7504257541c86fc8569bcf4b@163.172.171.38:30303",
-		"enode://efe4f2493f4aff2d641b1db8366b96ddacfe13e7a6e9c8f8f8cf49f9cdba0fdf3258d8c8f8d0c5db529f8123c8f1d95f36d54d590ca1bb366a5818b9a4ba521c@163.172.187.252:30303",
-		"enode://bcc7240543fe2cf86f5e9093d05753dd83343f8fda7bf0e833f65985c73afccf8f981301e13ef49c4804491eab043647374df1c4adf85766af88a624ecc3330e@136.243.154.244:30303",
-		"enode://ed4227681ca8c70beb2277b9e870353a9693f12e7c548c35df6bca6a956934d6f659999c2decb31f75ce217822eefca149ace914f1cbe461ed5a2ebaf9501455@88.212.206.70:30303",
-		"enode://cadc6e573b6bc2a9128f2f635ac0db3353e360b56deef239e9be7e7fce039502e0ec670b595f6288c0d2116812516ad6b6ff8d5728ff45eba176989e40dead1e@37.128.191.230:30303",
-		"enode://595a9a06f8b9bc9835c8723b6a82105aea5d55c66b029b6d44f229d6d135ac3ecdd3e9309360a961ea39d7bee7bac5d03564077a4e08823acc723370aace65ec@46.20.235.22:30303",
-		"enode://029178d6d6f9f8026fc0bc17d5d1401aac76ec9d86633bba2320b5eed7b312980c0a210b74b20c4f9a8b0b2bf884b111fa9ea5c5f916bb9bbc0e0c8640a0f56c@216.158.85.185:30303",
-		"enode://fdd1b9bb613cfbc200bba17ce199a9490edc752a833f88d4134bf52bb0d858aa5524cb3ec9366c7a4ef4637754b8b15b5dc913e4ed9fdb6022f7512d7b63f181@212.47.247.103:30303",
-		"enode://cc26c9671dffd3ee8388a7c8c5b601ae9fe75fc0a85cedb72d2dd733d5916fad1d4f0dcbebad5f9518b39cc1f96ba214ab36a7fa5103aaf17294af92a89f227b@52.79.241.155:30303",
-		"enode://140872ce4eee37177fbb7a3c3aa4aaebe3f30bdbf814dd112f6c364fc2e325ba2b6a942f7296677adcdf753c33170cb4999d2573b5ff7197b4c1868f25727e45@52.78.149.82:30303"
+		"enode://d860a01f9722d78051619d1e2351aba3f43f943f6f00718d1b9baa4101932a1f5011f16bb2b1bb35db20d6fe28fa0bf09636d26a87d31de9ec6203eeedb1f666@18.138.108.67:30303",
+		"enode://22a8232c3abc76a16ae9d6c3b164f98775fe226f0917b0ca871128a74a8e9630b458460865bab457221f1d448dd9791d24c4e5d88786180ac185df813a68d4de@3.209.45.79:30303",
+		"enode://ca6de62fce278f96aea6ec5a2daadb877e51651247cb96ee310a318def462913b653963c155a0ef6c7d50048bba6e6cea881130857413d9f50a621546b590758@34.255.23.113:30303",
+		"enode://279944d8dcd428dffaa7436f25ca0ca43ae19e7bcf94a8fb7d1641651f92d121e972ac2e8f381414b80cc8e5555811c2ec6e1a99bb009b3f53c4c69923e11bd8@35.158.244.151:30303",
+		"enode://8499da03c47d637b20eee24eec3c356c9a2e6148d6fe25ca195c7949ab8ec2c03e3556126b0d7ed644675e78c4318b08691b7b57de10e5f0d40d05b09238fa0a@52.187.207.27:30303",
+		"enode://103858bdb88756c71f15e9b5e09b56dc1be52f0a5021d46301dbbfb7e130029cc9d0d6f73f693bc29b665770fff7da4d34f3c6379fe12721b5d7a0bcb5ca1fc1@191.234.162.198:30303",
+		"enode://715171f50508aba88aecd1250af392a45a330af91d7b90701c436b618c86aaa1589c9184561907bebbb56439b8f8787bc01f49a7c77276c58c1b09822d75e8e8@52.231.165.108:30303",
+		"enode://5d6d7cd20d6da4bb83a1d28cadb5d409b64edf314c0335df658c1a54e32c7c4a7ab7823d57c39b6a757556e68ff1df17c748b698544a55cb488b52479a92b60f@104.42.217.25:30303"
 	],
 	"accounts": {
 		"0x0000000000000000000000000000000000000001": {
diff --git a/ethcore/res/ethereum/goerli.json b/ethcore/res/ethereum/goerli.json
index 4c00cc43e..28cd3ef30 100644
--- a/ethcore/res/ethereum/goerli.json
+++ b/ethcore/res/ethereum/goerli.json
@@ -55,7 +55,7 @@
 	"nodes": [
 		"enode://06333009fc9ef3c9e174768e495722a7f98fe7afd4660542e983005f85e556028410fd03278944f44cfe5437b1750b5e6bd1738f700fe7da3626d52010d2954c@51.141.15.254:30303",
 		"enode://176b9417f511d05b6b2cf3e34b756cf0a7096b3094572a8f6ef4cdcb9d1f9d00683bf0f83347eebdf3b81c3521c2332086d9592802230bf528eaf606a1d9677b@13.93.54.137:30303",
-		"enode://573b6607cd59f241e30e4c4943fd50e99e2b6f42f9bd5ca111659d309c06741247f4f1e93843ad3e8c8c18b6e2d94c161b7ef67479b3938780a97134b618b5ce@52.56.136.200:30303",
+		"enode://a61215641fb8714a373c80edbfa0ea8878243193f57c96eeb44d0bc019ef295abd4e044fd619bfc4c59731a73fb79afe84e9ab6da0c743ceb479cbb6d263fa91@3.11.147.67:30303",
 		"enode://67913271d14f445689e8310270c304d42f268428f2de7a4ac0275bea97690e021df6f549f462503ff4c7a81d9dd27288867bbfa2271477d0911378b8944fae55@157.230.239.163:30303",
 		"enode://a87685902a0622e9cf18c68e73a0ea45156ec53e857ef049b185a9db2296ca04d776417bf1901c0b4eacb5b26271d8694e88e3f17c20d49eb77e1a41ab26b5b3@51.141.78.53:30303",
 		"enode://ae8658da8d255d1992c3ec6e62e11d6e1c5899aa1566504bc1ff96a0c9c8bd44838372be643342553817f5cc7d78f1c83a8093dee13d77b3b0a583c050c81940@18.232.185.151:30303",
diff --git a/ethcore/res/ethereum/kotti.json b/ethcore/res/ethereum/kotti.json
index 52019bcdc..aeea86b08 100644
--- a/ethcore/res/ethereum/kotti.json
+++ b/ethcore/res/ethereum/kotti.json
@@ -54,7 +54,8 @@
 		"enode://06333009fc9ef3c9e174768e495722a7f98fe7afd4660542e983005f85e556028410fd03278944f44cfe5437b1750b5e6bd1738f700fe7da3626d52010d2954c@51.141.15.254:30303",
 		"enode://93c94e999be5dd854c5d82a7cf5c14822973b5d9badb56ad4974586ec4d4f1995c815af795c20bb6e0a6226d3ee55808435c4dc89baf94ee581141b064d19dfc@80.187.116.161:25720",
 		"enode://ae8658da8d255d1992c3ec6e62e11d6e1c5899aa1566504bc1ff96a0c9c8bd44838372be643342553817f5cc7d78f1c83a8093dee13d77b3b0a583c050c81940@18.232.185.151:30303",
-		"enode://b477ca6d507a3f57070783eb62ba838847635f8b1a0cbffb8b7f8173f5894cf550f0225a5c279341e2d862a606e778b57180a4f1db3db78c51eadcfa4fdc6963@40.68.240.160:30303"
+		"enode://b477ca6d507a3f57070783eb62ba838847635f8b1a0cbffb8b7f8173f5894cf550f0225a5c279341e2d862a606e778b57180a4f1db3db78c51eadcfa4fdc6963@40.68.240.160:30303",
+		"enode://a59e33ccd2b3e52d578f1fbd70c6f9babda2650f0760d6ff3b37742fdcdfdb3defba5d56d315b40c46b70198c7621e63ffa3f987389c7118634b0fefbbdfa7fd@51.158.191.43:37956"
 	],
 	"accounts": {
 		"0x0000000000000000000000000000000000000000": {
diff --git a/ethcore/res/ethereum/mordor.json b/ethcore/res/ethereum/mordor.json
index 1ea7d2bde..e33c14518 100644
--- a/ethcore/res/ethereum/mordor.json
+++ b/ethcore/res/ethereum/mordor.json
@@ -59,14 +59,16 @@
 		"gasLimit":"0x2fefd8"
 	},
 	"nodes":[
-		"enode://03b133f731049e3f7be827339c3759be92778c05e54a1847d178c0fdb56fa168aa1e7e61fc77791a7afdd0328a00318f73c01212eb3f3bbe919f5ce8f5b4a314@192.227.105.4:32000",
-		"enode://06fdbeb591d26f53b2e7250025fe955ca013431ded930920cf1e3cd1f0c920e9a5e727949d209bc25a07288327b525279b11c5551315c50ff0db483e69fc159b@34.218.225.178:32000",
-		"enode://1813e90a0afdd7c1e4892c5376960e3577a9e6c5a4f86fa405a405c7421a4a1608248d77cc90333842f13d8954d82113dec480cfb76b4fef8cb475157cf4d5f2@10.28.224.3:30000",
 		"enode://2b69a3926f36a7748c9021c34050be5e0b64346225e477fe7377070f6289bd363b2be73a06010fd516e6ea3ee90778dd0399bc007bb1281923a79374f842675a@51.15.116.226:30303",
+		"enode://a59e33ccd2b3e52d578f1fbd70c6f9babda2650f0760d6ff3b37742fdcdfdb3defba5d56d315b40c46b70198c7621e63ffa3f987389c7118634b0fefbbdfa7fd@51.158.191.43:38556",
+		"enode://5a1399e6ba3268721dd7656530cd81230dbeb950570c6e3ec2a45effc50c032f66633c5eaaa1a49c51ba1849db37a7bef6e402779ad12dc9943f117e058d7760@34.69.121.227:30303",
+		"enode://03b133f731049e3f7be827339c3759be92778c05e54a1847d178c0fdb56fa168aa1e7e61fc77791a7afdd0328a00318f73c01212eb3f3bbe919f5ce8f5b4a314@192.227.105.4:32000",
 		"enode://621e28e529146fd501709194885f50540c494f1a2985d1fb4ec8769226b5cb0b0d1a11545926077821474c2767cdd87888ead8a2509a2c9069dd5584e4b1c3b8@10.28.223.8:30000",
+		"enode://2592745efd35b4be443b8ee25fd2099de132e037951f9f6d3e8805e0a78f213537f71264b973f1a83a57372f57bbe6acac8d6ae678f39393221c045ccbe3b18c@51.15.116.226:30304",
 		"enode://a59e33ccd2b3e52d578f1fbd70c6f9babda2650f0760d6ff3b37742fdcdfdb3defba5d56d315b40c46b70198c7621e63ffa3f987389c7118634b0fefbbdfa7fd@51.15.116.226:30303",
-		"enode://f840b007500f50c98ea6f9c9e56dabf4690bbbbb7036d43682c531204341aff8315013547e5bee54117eb22bd3603585ae6bf713d9fa710659533fcab65d5b84@35.238.101.58:30000",
-		"enode://19eda672030ad5debb98c9069b3e99d12438b96506325d9f3f82d76c5f8ce4942d345f41700a5223900e75ad48e76713b74c1b694d67a10c2112540035922256@35.238.101.58:30000"
+		"enode://f840b007500f50c98ea6f9c9e56dabf4690bbbbb7036d43682c531204341aff8315013547e5bee54117eb22bd3603585ae6bf713d9fa710659533fcab65d5b84@35.238.101.58:30303",
+		"enode://1813e90a0afdd7c1e4892c5376960e3577a9e6c5a4f86fa405a405c7421a4a1608248d77cc90333842f13d8954d82113dec480cfb76b4fef8cb475157cf4d5f2@10.28.224.3:30000",
+		"enode://06fdbeb591d26f53b2e7250025fe955ca013431ded930920cf1e3cd1f0c920e9a5e727949d209bc25a07288327b525279b11c5551315c50ff0db483e69fc159b@34.218.225.178:32000"
 	],
 	"accounts":{
 		"0x0000000000000000000000000000000000000001":{
diff --git a/ethcore/service/Cargo.toml b/ethcore/service/Cargo.toml
index 6a45b6c59..13f2c6c0c 100644
--- a/ethcore/service/Cargo.toml
+++ b/ethcore/service/Cargo.toml
@@ -14,7 +14,7 @@ ethcore-io = { path = "../../util/io" }
 ethcore-private-tx = { path = "../private-tx" }
 ethcore-sync = { path = "../sync" }
 ethereum-types = "0.8.0"
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 snapshot = { path = "../snapshot" }
 spec = { path = "../spec" }
@@ -23,5 +23,5 @@ trace-time = "0.1"
 [dev-dependencies]
 ethcore = { path = "..", features = ["test-helpers"] }
 ethcore-db = { path = "../db" }
-kvdb-rocksdb = "0.3.0"
+kvdb-rocksdb = "0.4.1"
 tempdir = "0.3"
diff --git a/ethcore/snapshot/Cargo.toml b/ethcore/snapshot/Cargo.toml
index 0619a93c6..5d03048e9 100644
--- a/ethcore/snapshot/Cargo.toml
+++ b/ethcore/snapshot/Cargo.toml
@@ -29,7 +29,7 @@ itertools = "0.5"
 journaldb = { path = "../../util/journaldb" }
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4.8"
 num_cpus = "1.10.1"
 rand = "0.7"
@@ -53,7 +53,7 @@ ethabi-contract = "9.0.0"
 ethabi-derive = "9.0.1"
 ethcore = { path = "..", features = ["test-helpers"] }
 ethkey = { path = "../../accounts/ethkey" }
-kvdb-rocksdb = "0.3.0"
+kvdb-rocksdb = "0.4.1"
 lazy_static = { version = "1.3" }
 spec = { path = "../spec" }
 tempdir = "0.3"
diff --git a/ethcore/snapshot/snapshot-tests/Cargo.toml b/ethcore/snapshot/snapshot-tests/Cargo.toml
index 585447f22..1e3f2fb5b 100644
--- a/ethcore/snapshot/snapshot-tests/Cargo.toml
+++ b/ethcore/snapshot/snapshot-tests/Cargo.toml
@@ -23,8 +23,8 @@ hash-db = "0.15.0"
 journaldb = { path = "../../../util/journaldb" }
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../../util/keccak-hasher" }
-kvdb = "0.2"
-kvdb-rocksdb = "0.3.0"
+kvdb = "0.3.1"
+kvdb-rocksdb = "0.4.1"
 log = "0.4.8"
 parking_lot = "0.9"
 parity-crypto = { version = "0.4.2", features = ["publickey"] }
diff --git a/ethcore/spec/Cargo.toml b/ethcore/spec/Cargo.toml
index ea8f08fe3..570a2df71 100644
--- a/ethcore/spec/Cargo.toml
+++ b/ethcore/spec/Cargo.toml
@@ -25,7 +25,7 @@ hash-db = "0.15.0"
 instant-seal = { path = "../engines/instant-seal" }
 journaldb = { path = "../../util/journaldb" }
 keccak-hash = "0.4.0"
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
 log = "0.4.8"
 machine = { path = "../machine" }
 null-engine = { path = "../engines/null-engine" }
diff --git a/ethcore/spec/src/spec.rs b/ethcore/spec/src/spec.rs
index 6fa41bc59..1116fc626 100644
--- a/ethcore/spec/src/spec.rs
+++ b/ethcore/spec/src/spec.rs
@@ -52,7 +52,7 @@ use pod::PodState;
 use rlp::{Rlp, RlpStream};
 use trace::{NoopTracer, NoopVMTracer};
 use trie_vm_factories::Factories;
-use vm::{EnvInfo, CallType, ActionValue, ActionParams, ParamsType};
+use vm::{EnvInfo, ActionType, ActionValue, ActionParams, ParamsType};
 
 use crate::{
 	Genesis,
@@ -163,7 +163,7 @@ fn run_constructors<T: Backend>(
 				value: ActionValue::Transfer(Default::default()),
 				code: Some(Arc::new(constructor.clone())),
 				data: None,
-				call_type: CallType::None,
+				action_type: ActionType::Create,
 				params_type: ParamsType::Embedded,
 			};
 
@@ -250,9 +250,10 @@ impl From<ethjson::spec::HardcodedSync> for SpecHardcodedSync {
 impl fmt::Display for SpecHardcodedSync {
 	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 		writeln!(f, "{{")?;
-		writeln!(f, r#"header": "{:?},"#, self.header)?;
-		writeln!(f, r#"total_difficulty": "{:?},"#, self.total_difficulty)?;
-		writeln!(f, r#"chts": {:#?}"#, self.chts.iter().map(|x| format!(r#"{:?}"#, x)).collect::<Vec<_>>())?;
+		writeln!(f, r#""header": "{:x}","#, self.header)?;
+		writeln!(f, r#""totalDifficulty": "{:?}""#, self.total_difficulty)?;
+		// TODO: #11415 - fix trailing comma for CHTs
+		writeln!(f, r#""CHTs": {:#?}"#, self.chts.iter().map(|x| format!("{:?}", x)).collect::<Vec<_>>())?;
 		writeln!(f, "}}")
 	}
 }
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index 831516e01..699f543ea 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -262,7 +262,7 @@ impl Importer {
 		let block_queue = BlockQueue::new(
 			config.queue.clone(),
 			engine.clone(),
-			message_channel.clone(),
+			message_channel,
 			config.verifier_type.verifying_seal()
 		);
 
@@ -404,11 +404,11 @@ impl Importer {
 		let verify_external_result = engine.verify_block_external(&header);
 		if let Err(e) = verify_external_result {
 			warn!(target: "client", "Stage 4 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-			return Err(e.into());
+			return Err(e);
 		};
 
 		// Enact Verified Block
-		let last_hashes = client.build_last_hashes(header.parent_hash());
+		let last_hashes = client.build_last_hashes(*header.parent_hash());
 		let db = client.state_db.read().boxed_clone_canon(header.parent_hash());
 
 		let is_epoch_begin = chain.epoch_transition(parent.number(), *header.parent_hash()).is_some();
@@ -428,7 +428,7 @@ impl Importer {
 			Ok(b) => b,
 			Err(e) => {
 				warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-				return Err(e.into());
+				return Err(e);
 			}
 		};
 
@@ -444,7 +444,7 @@ impl Importer {
 		// Final Verification
 		if let Err(e) = verification::verify_block_final(&header, &locked_block.header) {
 			warn!(target: "client", "Stage 5 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-			return Err(e.into());
+			return Err(e);
 		}
 
 		let pending = self.check_epoch_end_signal(
@@ -562,14 +562,14 @@ impl Importer {
 			a
 		}).collect();
 
-		let route = chain.insert_block(&mut batch, block_data, receipts.clone(), ExtrasInsert {
+		let route = chain.insert_block(&mut batch, block_data, receipts, ExtrasInsert {
 			fork_choice,
 			is_finalized,
 		});
 
 		client.tracedb.read().import(&mut batch, TraceImportRequest {
 			traces: traces.into(),
-			block_hash: hash.clone(),
+			block_hash: *hash,
 			block_number: number,
 			enacted: route.enacted.clone(),
 			retracted: route.retracted.len()
@@ -619,10 +619,10 @@ impl Importer {
 					Proof::WithState(with_state) => {
 						let env_info = EnvInfo {
 							number: header.number(),
-							author: header.author().clone(),
+							author: *header.author(),
 							timestamp: header.timestamp(),
-							difficulty: header.difficulty().clone(),
-							last_hashes: client.build_last_hashes(header.parent_hash()),
+							difficulty: *header.difficulty(),
+							last_hashes: client.build_last_hashes(*header.parent_hash()),
 							gas_used: U256::default(),
 							gas_limit: u64::max_value().into(),
 						};
@@ -636,7 +636,7 @@ impl Importer {
 
 							let mut state = State::from_existing(
 								backend,
-								header.state_root().clone(),
+								*header.state_root(),
 								self.engine.account_start_nonce(header.number()),
 								client.factories.clone(),
 							).expect("state known to be available for just-imported block; qed");
@@ -669,7 +669,7 @@ impl Importer {
 
 				debug!(target: "client", "Block {} signals epoch end.", hash);
 
-				Ok(Some(PendingTransition { proof: proof }))
+				Ok(Some(PendingTransition { proof }))
 			},
 			EpochChange::No => Ok(None),
 			EpochChange::Unsure(_) => {
@@ -777,7 +777,7 @@ impl Client {
 			chain: RwLock::new(chain),
 			tracedb,
 			engine,
-			pruning: config.pruning.clone(),
+			pruning: config.pruning,
 			snapshotting_at: AtomicU64::new(0),
 			db: RwLock::new(db.clone()),
 			state_db: RwLock::new(state_db),
@@ -824,7 +824,7 @@ impl Client {
 				chain.insert_epoch_transition(&mut batch, 0, EpochTransition {
 					block_hash: gh.hash(),
 					block_number: 0,
-					proof: proof,
+					proof,
 				});
 
 				client.db.read().key_value().write_buffered(batch);
@@ -901,17 +901,17 @@ impl Client {
 				author: header.author(),
 				timestamp: header.timestamp(),
 				difficulty: header.difficulty(),
-				last_hashes: self.build_last_hashes(&header.parent_hash()),
+				last_hashes: self.build_last_hashes(header.parent_hash()),
 				gas_used: U256::default(),
 				gas_limit: header.gas_limit(),
 			}
 		})
 	}
 
-	fn build_last_hashes(&self, parent_hash: &H256) -> Arc<LastHashes> {
+	fn build_last_hashes(&self, parent_hash: H256) -> Arc<LastHashes> {
 		{
 			let hashes = self.last_hashes.read();
-			if hashes.front().map_or(false, |h| h == parent_hash) {
+			if hashes.front().map_or(false, |h| h == &parent_hash) {
 				let mut res = Vec::from(hashes.clone());
 				res.resize(256, H256::zero());
 				return Arc::new(res);
@@ -919,12 +919,12 @@ impl Client {
 		}
 		let mut last_hashes = LastHashes::new();
 		last_hashes.resize(256, H256::zero());
-		last_hashes[0] = parent_hash.clone();
+		last_hashes[0] = parent_hash;
 		let chain = self.chain.read();
 		for i in 0..255 {
 			match chain.block_details(&last_hashes[i]) {
 				Some(details) => {
-					last_hashes[i + 1] = details.parent.clone();
+					last_hashes[i + 1] = details.parent;
 				},
 				None => break,
 			}
@@ -941,7 +941,7 @@ impl Client {
 		let call = |a, d| {
 			let tx = self.contract_call_tx(id, a, d);
 			let (result, items) = self.prove_transaction(tx, id)
-				.ok_or_else(|| format!("Unable to make call. State unavailable?"))?;
+				.ok_or_else(|| "Unable to make call. State unavailable?".to_string())?;
 
 			let items = items.into_iter().map(|x| x.to_vec()).collect();
 			Ok((result, items))
@@ -1296,7 +1296,11 @@ impl DatabaseRestore for Client {
 impl BlockChainReset for Client {
 	fn reset(&self, num: u32) -> Result<(), String> {
 		if num as u64 > self.pruning_history() {
-			return Err(format!("Attempting to reset the chain {} blocks back failed: state is pruned (max available: {})", num, self.pruning_history()).into())
+			return Err(
+				format!("Attempting to reset the chain {} blocks back failed: state is pruned (max available: {})",
+					num,
+					self.pruning_history()
+			));
 		} else if num == 0 {
 			return Err("0 is an invalid number of blocks to reset".into())
 		}
@@ -1450,26 +1454,28 @@ impl ImportBlock for Client {
 		}
 
 		let raw = if self.importer.block_queue.is_empty() {
-			Some((
-				unverified.bytes.clone(),
-				unverified.header.hash(),
-				*unverified.header.difficulty(),
-			))
-		} else { None };
+			Some((unverified.bytes.clone(), *unverified.header.difficulty()))
+		} else {
+			None
+		};
 
 		match self.importer.block_queue.import(unverified) {
 			Ok(hash) => {
-				if let Some((raw, hash, difficulty)) = raw {
-					self.notify(move |n| n.block_pre_import(&raw, &hash, &difficulty));
+				if let Some((bytes, difficulty)) = raw {
+					self.notify(move |n| n.block_pre_import(&bytes, &hash, &difficulty));
 				}
 				Ok(hash)
 			},
 			// we only care about block errors (not import errors)
-			Err((block, EthcoreError::Block(err))) => {
-				self.importer.bad_blocks.report(block.bytes, format!("{:?}", err));
-				return Err(EthcoreError::Block(err))
+			Err((EthcoreError::Block(e), Some(input))) => {
+				self.importer.bad_blocks.report(input.bytes, e.to_string());
+				Err(EthcoreError::Block(e))
 			},
-			Err((_, e)) => Err(e),
+			Err((EthcoreError::Block(e), None)) => {
+				error!(target: "client", "BlockError {} detected but it was missing raw_bytes of the block", e);
+				Err(EthcoreError::Block(e))
+			}
+			Err((e, _input)) => Err(e),
 		}
 	}
 
@@ -1497,10 +1503,10 @@ impl Call for Client {
 	fn call(&self, transaction: &SignedTransaction, analytics: CallAnalytics, state: &mut Self::State, header: &Header) -> Result<Executed, CallError> {
 		let env_info = EnvInfo {
 			number: header.number(),
-			author: header.author().clone(),
+			author: *header.author(),
 			timestamp: header.timestamp(),
-			difficulty: header.difficulty().clone(),
-			last_hashes: self.build_last_hashes(header.parent_hash()),
+			difficulty: *header.difficulty(),
+			last_hashes: self.build_last_hashes(*header.parent_hash()),
 			gas_used: U256::default(),
 			gas_limit: U256::max_value(),
 		};
@@ -1512,10 +1518,10 @@ impl Call for Client {
 	fn call_many(&self, transactions: &[(SignedTransaction, CallAnalytics)], state: &mut Self::State, header: &Header) -> Result<Vec<Executed>, CallError> {
 		let mut env_info = EnvInfo {
 			number: header.number(),
-			author: header.author().clone(),
+			author: *header.author(),
 			timestamp: header.timestamp(),
-			difficulty: header.difficulty().clone(),
-			last_hashes: self.build_last_hashes(header.parent_hash()),
+			difficulty: *header.difficulty(),
+			last_hashes: self.build_last_hashes(*header.parent_hash()),
 			gas_used: U256::default(),
 			gas_limit: U256::max_value(),
 		};
@@ -1539,10 +1545,10 @@ impl Call for Client {
 
 			let env_info = EnvInfo {
 				number: header.number(),
-				author: header.author().clone(),
+				author: *header.author(),
 				timestamp: header.timestamp(),
-				difficulty: header.difficulty().clone(),
-				last_hashes: self.build_last_hashes(header.parent_hash()),
+				difficulty: *header.difficulty(),
+				last_hashes: self.build_last_hashes(*header.parent_hash()),
 				gas_used: U256::default(),
 				gas_limit: max,
 			};
@@ -1634,7 +1640,7 @@ impl BlockChainClient for Client {
 		let address = self.transaction_address(id).ok_or_else(|| CallError::TransactionNotFound)?;
 		let block = BlockId::Hash(address.block_hash);
 
-		const PROOF: &'static str = "The transaction address contains a valid index within block; qed";
+		const PROOF: &str = "The transaction address contains a valid index within block; qed";
 		Ok(self.replay_block_transactions(block, analytics)?.nth(address.index).expect(PROOF).1)
 	}
 
@@ -1645,8 +1651,8 @@ impl BlockChainClient for Client {
 		let txs = body.transactions();
 		let engine = self.engine.clone();
 
-		const PROOF: &'static str = "Transactions fetched from blockchain; blockchain transactions are valid; qed";
-		const EXECUTE_PROOF: &'static str = "Transaction replayed; qed";
+		const PROOF: &str = "Transactions fetched from blockchain; blockchain transactions are valid; qed";
+		const EXECUTE_PROOF: &str = "Transaction replayed; qed";
 
 		Ok(Box::new(txs.into_iter()
 			.map(move |t| {
@@ -1660,9 +1666,7 @@ impl BlockChainClient for Client {
 	}
 
 	fn mode(&self) -> Mode {
-		let r = self.mode.lock().clone().into();
-		trace!(target: "mode", "Asked for mode = {:?}. returning {:?}", &*self.mode.lock(), r);
-		r
+		self.mode.lock().clone()
 	}
 
 	fn queue_info(&self) -> BlockQueueInfo {
@@ -1682,7 +1686,7 @@ impl BlockChainClient for Client {
 		}
 		{
 			let mut mode = self.mode.lock();
-			*mode = new_mode.clone().into();
+			*mode = new_mode.clone();
 			trace!(target: "mode", "Mode now {:?}", &*mode);
 			if let Some(ref mut f) = *self.on_user_defaults_change.lock() {
 				trace!(target: "mode", "Making callback...");
@@ -1972,17 +1976,17 @@ impl BlockChainClient for Client {
 			// pending logs themselves).
 			let from = match self.block_number_ref(&filter.from_block) {
 				Some(val) if val <= chain.best_block_number() => val,
-				_ => return Err(filter.from_block.clone()),
+				_ => return Err(filter.from_block),
 			};
 			let to = match self.block_number_ref(&filter.to_block) {
 				Some(val) if val <= chain.best_block_number() => val,
-				_ => return Err(filter.to_block.clone()),
+				_ => return Err(filter.to_block),
 			};
 
 			// If from is greater than to, then the current bloom filter behavior is to just return empty
 			// result. There's no point to continue here.
 			if from > to {
-				return Err(filter.to_block.clone());
+				return Err(filter.to_block);
 			}
 
 			chain.blocks_with_bloom(&filter.bloom_possibilities(), from, to)
@@ -1993,7 +1997,7 @@ impl BlockChainClient for Client {
 			// Otherwise, we use a slower version that finds a link between from_block and to_block.
 			let from_hash = match Self::block_hash(&chain, filter.from_block) {
 				Some(val) => val,
-				None => return Err(filter.from_block.clone()),
+				None => return Err(filter.from_block),
 			};
 			let from_number = match chain.block_number(&from_hash) {
 				Some(val) => val,
@@ -2001,7 +2005,7 @@ impl BlockChainClient for Client {
 			};
 			let to_hash = match Self::block_hash(&chain, filter.to_block) {
 				Some(val) => val,
-				None => return Err(filter.to_block.clone()),
+				None => return Err(filter.to_block),
 			};
 
 			let blooms = filter.bloom_possibilities();
@@ -2103,7 +2107,7 @@ impl BlockChainClient for Client {
 	}
 
 	fn last_hashes(&self) -> LastHashes {
-		(*self.build_last_hashes(&self.chain.read().best_block_hash())).clone()
+		self.build_last_hashes(self.chain.read().best_block_hash()).to_vec()
 	}
 
 	fn transactions_to_propagate(&self) -> Vec<Arc<VerifiedTransaction>> {
@@ -2338,7 +2342,7 @@ impl PrepareOpenBlock for Client {
 			self.tracedb.read().tracing_enabled(),
 			self.state_db.read().boxed_clone_canon(&h),
 			&best_header,
-			self.build_last_hashes(&h),
+			self.build_last_hashes(h),
 			author,
 			gas_range_target,
 			extra_data,
@@ -2388,7 +2392,7 @@ impl ImportSealedBlock for Client {
 					block.rlp_bytes(),
 					format!("Detected an issue with locally sealed block: {}", e),
 				);
-				return Err(e.into());
+				return Err(e);
 			}
 
 			// scope for self.import_lock
@@ -2517,12 +2521,12 @@ impl ProvingBlockChainClient for Client {
 			_ => return None,
 		};
 
-		env_info.gas_limit = transaction.gas.clone();
+		env_info.gas_limit = transaction.gas;
 		let mut jdb = self.state_db.read().journal_db().boxed_clone();
 
 		executive_state::prove_transaction_virtual(
 			jdb.as_hash_db_mut(),
-			header.state_root().clone(),
+			header.state_root(),
 			&transaction,
 			self.engine.machine(),
 			&env_info,
@@ -2758,12 +2762,12 @@ fn transaction_receipt(
 		from: sender,
 		to: match tx.action {
 				Action::Create => None,
-				Action::Call(ref address) => Some(address.clone().into())
+				Action::Call(ref address) => Some(*address)
 		},
-		transaction_hash: transaction_hash,
-		transaction_index: transaction_index,
-		block_hash: block_hash,
-		block_number: block_number,
+		transaction_hash,
+		transaction_index,
+		block_hash,
+		block_number,
 		cumulative_gas_used: receipt.gas_used,
 		gas_used: receipt.gas_used - prior_gas_used,
 		contract_address: match tx.action {
@@ -2772,10 +2776,10 @@ fn transaction_receipt(
 		},
 		logs: receipt.logs.into_iter().enumerate().map(|(i, log)| LocalizedLogEntry {
 			entry: log,
-			block_hash: block_hash,
-			block_number: block_number,
-			transaction_hash: transaction_hash,
-			transaction_index: transaction_index,
+			block_hash,
+			block_number,
+			transaction_hash,
+			transaction_index,
 			transaction_log_index: i,
 			log_index: prior_no_of_logs + i,
 		}).collect(),
@@ -2921,8 +2925,8 @@ mod tests {
 		let tx1 = raw_tx.clone().sign(secret, None);
 		let transaction = LocalizedTransaction {
 			signed: tx1.clone().into(),
-			block_number: block_number,
-			block_hash: block_hash,
+			block_number,
+			block_hash,
 			transaction_index: 1,
 			cached_sender: Some(tx1.sender()),
 		};
@@ -2937,7 +2941,7 @@ mod tests {
 		}];
 		let receipt = Receipt {
 			outcome: TransactionOutcome::StateRoot(state_root),
-			gas_used: gas_used,
+			gas_used,
 			log_bloom: Default::default(),
 			logs: logs.clone(),
 		};
diff --git a/ethcore/src/json_tests/executive.rs b/ethcore/src/json_tests/executive.rs
index 0a79be7cf..212197e90 100644
--- a/ethcore/src/json_tests/executive.rs
+++ b/ethcore/src/json_tests/executive.rs
@@ -20,7 +20,7 @@ use super::test_common::*;
 use account_state::{Backend as StateBackend, State};
 use evm::Finalize;
 use vm::{
-	self, ActionParams, CallType, Schedule, Ext,
+	self, ActionParams, ActionType, Schedule, Ext,
 	ContractCreateResult, EnvInfo, MessageCallResult,
 	CreateContractAddress, ReturnData,
 };
@@ -172,7 +172,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for TestExt<'a, T, V, B>
 		value: Option<U256>,
 		data: &[u8],
 		_code_address: &Address,
-		_call_type: CallType,
+		_call_type: ActionType,
 		_trap: bool
 	) -> Result<MessageCallResult, vm::TrapKind> {
 		self.callcreates.push(CallCreate {
diff --git a/ethcore/src/tests/evm.rs b/ethcore/src/tests/evm.rs
index 4b463cb48..f435502f8 100644
--- a/ethcore/src/tests/evm.rs
+++ b/ethcore/src/tests/evm.rs
@@ -18,7 +18,7 @@
 
 use std::sync::Arc;
 use hash::keccak;
-use vm::{EnvInfo, ActionParams, ActionValue, CallType, ParamsType};
+use vm::{EnvInfo, ActionParams, ActionValue, ActionType, ParamsType};
 use evm::Factory;
 use machine::{
 	executive::Executive,
@@ -62,7 +62,7 @@ fn test_blockhash_eip210(factory: Factory) {
 			code_hash: Some(blockhash_contract_code_hash),
 			code_version: 0.into(),
 			data: Some(H256::from_low_u64_be(i - 1).as_bytes().to_vec()),
-			call_type: CallType::Call,
+			action_type: ActionType::Call,
 			params_type: ParamsType::Separate,
 		};
 		let schedule = machine.schedule(env_info.number);
@@ -86,7 +86,7 @@ fn test_blockhash_eip210(factory: Factory) {
 		code_hash: Some(get_prev_hash_code_hash),
 		code_version: 0.into(),
 		data: None,
-		call_type: CallType::Call,
+		action_type: ActionType::Call,
 		params_type: ParamsType::Separate,
 	};
 	let schedule = machine.schedule(env_info.number);
diff --git a/ethcore/state-db/Cargo.toml b/ethcore/state-db/Cargo.toml
index d23eafcec..1cd738e13 100644
--- a/ethcore/state-db/Cargo.toml
+++ b/ethcore/state-db/Cargo.toml
@@ -16,7 +16,7 @@ hash-db = "0.15.0"
 keccak-hash = "0.4.0"
 keccak-hasher = { path = "../../util/keccak-hasher" }
 journaldb = { path = "../../util/journaldb" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4.6"
 lru-cache = "0.1.2"
 memory-cache = { path = "../../util/memory-cache" }
diff --git a/ethcore/sync/Cargo.toml b/ethcore/sync/Cargo.toml
index 3e458ced8..14e1d758b 100644
--- a/ethcore/sync/Cargo.toml
+++ b/ethcore/sync/Cargo.toml
@@ -40,7 +40,7 @@ env_logger = "0.5"
 engine = { path = "../engine" }
 ethcore = { path = "..", features = ["test-helpers"] }
 ethcore-io = { path = "../../util/io", features = ["mio"] }
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
 machine = { path = "../machine" }
 rand_xorshift = "0.2"
 rustc-hex = "1.0"
diff --git a/ethcore/sync/src/chain/mod.rs b/ethcore/sync/src/chain/mod.rs
index 8f9e296c0..2b506c04f 100644
--- a/ethcore/sync/src/chain/mod.rs
+++ b/ethcore/sync/src/chain/mod.rs
@@ -162,7 +162,12 @@ pub const PAR_PROTOCOL_VERSION_4: (u8, u8) = (4, 0x20);
 
 pub const MAX_BODIES_TO_SEND: usize = 256;
 pub const MAX_HEADERS_TO_SEND: usize = 512;
+/// Maximum number of "entries" to include in a GetDataNode request.
 pub const MAX_NODE_DATA_TO_SEND: usize = 1024;
+/// Maximum allowed duration for serving a batch GetNodeData request.
+const MAX_NODE_DATA_TOTAL_DURATION: Duration = Duration::from_secs(2);
+/// Maximum allowed duration for serving a single GetNodeData request.
+const MAX_NODE_DATA_SINGLE_DURATION: Duration = Duration::from_millis(100);
 pub const MAX_RECEIPTS_HEADERS_TO_SEND: usize = 256;
 const MIN_PEERS_PROPAGATION: usize = 4;
 const MAX_PEERS_PROPAGATION: usize = 128;
diff --git a/ethcore/sync/src/chain/supplier.rs b/ethcore/sync/src/chain/supplier.rs
index 43e1148fc..6596506ed 100644
--- a/ethcore/sync/src/chain/supplier.rs
+++ b/ethcore/sync/src/chain/supplier.rs
@@ -15,13 +15,14 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::cmp;
+use std::time::{Duration, Instant};
 
 use crate::sync_io::SyncIo;
 
 use bytes::Bytes;
 use enum_primitive::FromPrimitive;
 use ethereum_types::H256;
-use log::{debug, trace};
+use log::{debug, trace, warn};
 use network::{self, PeerId};
 use parking_lot::RwLock;
 use rlp::{Rlp, RlpStream};
@@ -56,6 +57,8 @@ use super::{
 	MAX_BODIES_TO_SEND,
 	MAX_HEADERS_TO_SEND,
 	MAX_NODE_DATA_TO_SEND,
+	MAX_NODE_DATA_TOTAL_DURATION,
+	MAX_NODE_DATA_SINGLE_DURATION,
 	MAX_RECEIPTS_HEADERS_TO_SEND,
 };
 
@@ -258,9 +261,9 @@ impl SyncSupplier {
 
 	/// Respond to GetNodeData request
 	fn return_node_data(io: &dyn SyncIo, r: &Rlp, peer_id: PeerId) -> RlpResponseResult {
-		let payload_soft_limit = io.payload_soft_limit();
+		let payload_soft_limit = io.payload_soft_limit(); // 4Mb
 		let mut count = r.item_count().unwrap_or(0);
-		trace!(target: "sync", "{} -> GetNodeData: {} entries", peer_id, count);
+		trace!(target: "sync", "{} -> GetNodeData: {} entries requested", peer_id, count);
 		if count == 0 {
 			debug!(target: "sync", "Empty GetNodeData request, ignoring.");
 			return Ok(None);
@@ -269,10 +272,20 @@ impl SyncSupplier {
 		let mut added = 0usize;
 		let mut data = Vec::new();
 		let mut total_bytes = 0;
+		let mut total_elpsd = Duration::from_secs(0);
 		for i in 0..count {
-			if let Some(node) = io.chain().state_data(&r.val_at::<H256>(i)?) {
+			let hash = &r.val_at(i)?;
+			let elpsd = Instant::now();
+			let state = io.chain().state_data(hash);
+
+			total_elpsd += elpsd.elapsed();
+			if elpsd.elapsed() > MAX_NODE_DATA_SINGLE_DURATION || total_elpsd > MAX_NODE_DATA_TOTAL_DURATION {
+				warn!(target: "sync", "{} -> GetNodeData:   item {}/{} – slow state fetch for hash {:?}; took {:?}",
+					peer_id, i, count, hash, elpsd);
+				break;
+			}
+			if let Some(node) = state {
 				total_bytes += node.len();
-				// Check that the packet won't be oversized
 				if total_bytes > payload_soft_limit {
 					break;
 				}
@@ -280,7 +293,8 @@ impl SyncSupplier {
 				added += 1;
 			}
 		}
-		trace!(target: "sync", "{} -> GetNodeData: return {} entries", peer_id, added);
+		trace!(target: "sync", "{} -> GetNodeData: returning {}/{} entries ({} bytes total in {:?})",
+			peer_id, added, count, total_bytes, total_elpsd);
 		let mut rlp = RlpStream::new_list(added);
 		for d in data {
 			rlp.append(&d);
@@ -540,7 +554,7 @@ mod test {
 		let rlp_result = result.unwrap();
 		assert!(rlp_result.is_some());
 
-		// the length of one rlp-encoded hashe
+		// the length of one rlp-encoded hash
 		let rlp = rlp_result.unwrap().1.out();
 		let rlp = Rlp::new(&rlp);
 		assert_eq!(Ok(1), rlp.item_count());
diff --git a/ethcore/sync/src/light_sync/sync_round.rs b/ethcore/sync/src/light_sync/sync_round.rs
index d6bcea214..2ec297333 100644
--- a/ethcore/sync/src/light_sync/sync_round.rs
+++ b/ethcore/sync/src/light_sync/sync_round.rs
@@ -234,7 +234,7 @@ impl Fetcher {
 				}
 
 				// state transition not triggered until drain is finished.
-				(SyncRound::Fetch(self))
+				SyncRound::Fetch(self)
 			}
 		}
 	}
diff --git a/ethcore/trace/Cargo.toml b/ethcore/trace/Cargo.toml
index 656070c99..ddfd20801 100644
--- a/ethcore/trace/Cargo.toml
+++ b/ethcore/trace/Cargo.toml
@@ -11,7 +11,7 @@ ethcore-blockchain = { path = "../blockchain" }
 ethcore-db = { path = "../db" }
 ethereum-types = "0.8.0"
 evm = { path = "../evm" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 parity-bytes = "0.1.0"
 parity-util-mem = "0.3.0"
diff --git a/ethcore/trace/src/db.rs b/ethcore/trace/src/db.rs
index 6fe27a5b2..4de60272c 100644
--- a/ethcore/trace/src/db.rs
+++ b/ethcore/trace/src/db.rs
@@ -374,13 +374,12 @@ mod tests {
 
 	use ethcore::test_helpers::new_db;
 	use ethereum_types::{H256, U256, Address};
-	use evm::CallType;
 	use kvdb::DBTransaction;
 
 	use crate::{
 		BlockNumber, Config, TraceDB, Database as TraceDatabase, ImportRequest, DatabaseExtras,
 		Filter, LocalizedTrace, AddressesFilter, TraceError,
-		trace::{Call, Action, Res},
+		trace::{Call, CallType, Action, Res},
 		flat::{FlatTrace, FlatBlockTraces, FlatTransactionTraces}
 	};
 
@@ -465,7 +464,7 @@ mod tests {
 					value: 3.into(),
 					gas: 4.into(),
 					input: vec![],
-					call_type: CallType::Call,
+					call_type: Some(CallType::Call).into(),
 				}),
 				result: Res::FailedCall(TraceError::OutOfGas),
 			}])]),
@@ -487,7 +486,7 @@ mod tests {
 					value: 3.into(),
 					gas: 4.into(),
 					input: vec![],
-					call_type: CallType::Call,
+					call_type: Some(CallType::Call).into(),
 				}),
 				result: Res::FailedCall(TraceError::OutOfGas),
 			}])]),
@@ -506,7 +505,7 @@ mod tests {
 				value: U256::from(3),
 				gas: U256::from(4),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call).into(),
 			}),
 			result: Res::FailedCall(TraceError::OutOfGas),
 			trace_address: vec![],
diff --git a/ethcore/trace/src/types/filter.rs b/ethcore/trace/src/types/filter.rs
index cb4b31269..b25e1de02 100644
--- a/ethcore/trace/src/types/filter.rs
+++ b/ethcore/trace/src/types/filter.rs
@@ -125,10 +125,9 @@ impl Filter {
 #[cfg(test)]
 mod tests {
 	use ethereum_types::{Address, Bloom, BloomInput};
-	use evm::CallType;
 	use crate::{
 		Filter, AddressesFilter, TraceError, RewardType,
-		trace::{Action, Call, Res, Create, CreateResult, Suicide, Reward},
+		trace::{Action, Call, CallType, Res, Create, CreationMethod, CreateResult, Suicide, Reward},
 		flat::FlatTrace,
 	};
 
@@ -273,7 +272,7 @@ mod tests {
 				value: 3.into(),
 				gas: 4.into(),
 				input: vec![0x5],
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call).into(),
 			}),
 			result: Res::FailedCall(TraceError::OutOfGas),
 			trace_address: vec![0].into_iter().collect(),
@@ -294,6 +293,7 @@ mod tests {
 				value: 3.into(),
 				gas: 4.into(),
 				init: vec![0x5],
+				creation_method: Some(CreationMethod::Create),
 			}),
 			result: Res::Create(CreateResult {
 				gas_used: 10.into(),
@@ -413,6 +413,7 @@ mod tests {
 				gas: 4.into(),
 				init: vec![0x5],
 				value: 3.into(),
+				creation_method: Some(CreationMethod::Create),
 			}),
 			result: Res::FailedCall(TraceError::BadInstruction),
 			trace_address: vec![].into_iter().collect(),
diff --git a/ethcore/trace/src/types/flat.rs b/ethcore/trace/src/types/flat.rs
index 1f0d87ddf..2fad0c27f 100644
--- a/ethcore/trace/src/types/flat.rs
+++ b/ethcore/trace/src/types/flat.rs
@@ -123,9 +123,8 @@ mod tests {
 	use rlp::*;
 	use crate::{
 		FlatBlockTraces, FlatTransactionTraces, FlatTrace,
-		trace::{Action, Res, CallResult, Call, Suicide, Reward, RewardType}
+		trace::{Action, Res, CallResult, Call, CallType, Suicide, Reward, RewardType}
 	};
-	use evm::CallType;
 
 	#[test]
 	fn encode_flat_transaction_traces() {
@@ -162,7 +161,7 @@ mod tests {
 				value: "3627e8f712373c0000".parse().unwrap(),
 				gas: 0x03e8.into(),
 				input: vec![],
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call).into(),
 			}),
 			result: Res::Call(CallResult {
 				gas_used: 0.into(),
@@ -179,7 +178,7 @@ mod tests {
 				value: 0.into(),
 				gas: 0x010c78.into(),
 				input: vec![0x41, 0xc0, 0xe1, 0xb5],
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call).into(),
 			}),
 			result: Res::Call(CallResult {
 				gas_used: 0x0127.into(),
diff --git a/ethcore/trace/src/types/trace.rs b/ethcore/trace/src/types/trace.rs
index a3fb92dec..72bac5858 100644
--- a/ethcore/trace/src/types/trace.rs
+++ b/ethcore/trace/src/types/trace.rs
@@ -16,12 +16,19 @@
 
 //! Tracing data types.
 
+// ================== NOTE ========================
+// IF YOU'RE ADDING A FIELD TO A STRUCT WITH
+// RLP ENCODING, MAKE SURE IT'S DONE IN A BACKWARDS
+// COMPATIBLE WAY!
+// ================== NOTE ========================
+
+use std::convert::TryFrom;
 use ethereum_types::{U256, Address, Bloom, BloomInput};
 use parity_bytes::Bytes;
 use rlp::{Rlp, RlpStream, Encodable, DecoderError, Decodable};
 use rlp_derive::{RlpEncodable, RlpDecodable};
 use vm::ActionParams;
-use evm::CallType;
+use evm::ActionType;
 use super::error::Error;
 
 /// `Call` result.
@@ -33,6 +40,33 @@ pub struct CallResult {
 	pub output: Bytes,
 }
 
+/// `Call` type. Distinguish between different types of contract interactions.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum CallType {
+	/// Call
+	Call,
+	/// Call code
+	CallCode,
+	/// Delegate call
+	DelegateCall,
+	/// Static call
+	StaticCall,
+}
+
+impl TryFrom<ActionType> for CallType {
+	type Error = &'static str;
+	fn try_from(action_type: ActionType) -> Result<Self, Self::Error> {
+		match action_type {
+			ActionType::Call => Ok(CallType::Call),
+			ActionType::CallCode => Ok(CallType::CallCode),
+			ActionType::DelegateCall => Ok(CallType::DelegateCall),
+			ActionType::StaticCall => Ok(CallType::StaticCall),
+			ActionType::Create => Err("Create cannot be converted to CallType"),
+			ActionType::Create2 => Err("Create2 cannot be converted to CallType"),
+		}
+	}
+}
+
 /// `Create` result.
 #[derive(Debug, Clone, PartialEq, RlpEncodable, RlpDecodable)]
 pub struct CreateResult {
@@ -51,6 +85,49 @@ impl CreateResult {
 	}
 }
 
+/// `Create` method. Distinguish between use of `CREATE` and `CREATE2` opcodes in an action.
+#[derive(Debug, Clone, PartialEq)]
+pub enum CreationMethod {
+	/// Create
+	Create,
+	/// Create2
+	Create2,
+}
+
+impl TryFrom<ActionType> for CreationMethod {
+	type Error = &'static str;
+	fn try_from(action_type: ActionType) -> Result<Self, Self::Error> {
+		match action_type {
+			ActionType::Call => Err("Call cannot be converted to CreationMethod"),
+			ActionType::CallCode => Err("CallCode cannot be converted to CreationMethod"),
+			ActionType::DelegateCall => Err("DelegateCall cannot be converted to CreationMethod"),
+			ActionType::StaticCall => Err("StaticCall cannot be converted to CreationMethod"),
+			ActionType::Create => Ok(CreationMethod::Create),
+			ActionType::Create2 => Ok(CreationMethod::Create2),
+		}
+	}
+}
+
+impl Encodable for CreationMethod {
+	fn rlp_append(&self, s: &mut RlpStream) {
+		let v = match *self {
+			CreationMethod::Create => 0u32,
+			CreationMethod::Create2 => 1,
+		};
+		Encodable::rlp_append(&v, s);
+	}
+}
+
+impl Decodable for CreationMethod {
+	fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
+		rlp.as_val().and_then(|v| Ok(match v {
+			0u32 => CreationMethod::Create,
+			1 => CreationMethod::Create2,
+			_ => return Err(DecoderError::Custom("Invalid value of CreationMethod item")),
+		}))
+	}
+}
+
 /// Description of a _call_ action, either a `CALL` operation or a message transaction.
 #[derive(Debug, Clone, PartialEq, RlpEncodable, RlpDecodable)]
 pub struct Call {
@@ -65,19 +142,96 @@ pub struct Call {
 	/// The input data provided to the call.
 	pub input: Bytes,
 	/// The type of the call.
-	pub call_type: CallType,
+	pub call_type: BackwardsCompatibleCallType,
+}
+
+/// This is essentially an `Option<CallType>`, but with a custom
+/// `rlp` en/de-coding which preserves backwards compatibility with
+/// the older encodings used in parity-ethereum versions < 2.7 and 2.7.0.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct BackwardsCompatibleCallType(pub Option<CallType>);
+
+impl From<Option<CallType>> for BackwardsCompatibleCallType {
+	fn from(option: Option<CallType>) -> Self {
+		BackwardsCompatibleCallType(option)
+	}
+}
+
+// Encoding is the same as `CallType_v2_6_x`.
+impl Encodable for BackwardsCompatibleCallType {
+	fn rlp_append(&self, s: &mut RlpStream) {
+		let v = match self.0 {
+			None => 0u32,
+			Some(CallType::Call) => 1,
+			Some(CallType::CallCode) => 2,
+			Some(CallType::DelegateCall) => 3,
+			Some(CallType::StaticCall) => 4,
+		};
+		Encodable::rlp_append(&v, s);
+	}
+}
+
+// Try to decode it as `CallType_v2_6_x` first, and then as `Option<CallType_v2_7_0>`.
+impl Decodable for BackwardsCompatibleCallType {
+	fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
+		if rlp.is_data() {
+			rlp.as_val().and_then(|v| Ok(match v {
+				0u32 => None,
+				1 => Some(CallType::Call),
+				2 => Some(CallType::CallCode),
+				3 => Some(CallType::DelegateCall),
+				4 => Some(CallType::StaticCall),
+				_ => return Err(DecoderError::Custom("Invalid value of CallType item")),
+			}.into()))
+		} else {
+			#[allow(non_camel_case_types)]
+			#[derive(Debug, Clone, Copy, PartialEq)]
+			enum CallType_v2_7_0 {
+				Call,
+				CallCode,
+				DelegateCall,
+				StaticCall,
+			}
+
+			impl Decodable for CallType_v2_7_0 {
+				fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
+					rlp.as_val().and_then(|v| Ok(match v {
+						0u32 => CallType_v2_7_0::Call,
+						1 => CallType_v2_7_0::CallCode,
+						2 => CallType_v2_7_0::DelegateCall,
+						3 => CallType_v2_7_0::StaticCall,
+						_ => return Err(DecoderError::Custom("Invalid value of CallType item")),
+					}))
+				}
+			}
+
+			impl From<CallType_v2_7_0> for CallType {
+				fn from(old_call_type: CallType_v2_7_0) -> Self {
+					match old_call_type {
+						CallType_v2_7_0::Call => Self::Call,
+						CallType_v2_7_0::CallCode => Self::CallCode,
+						CallType_v2_7_0::DelegateCall => Self::DelegateCall,
+						CallType_v2_7_0::StaticCall => Self::StaticCall,
+					}
+				}
+			}
+
+			let optional: Option<CallType_v2_7_0> = Decodable::decode(rlp)?;
+			Ok(optional.map(Into::into).into())
+		}
+	}
 }
 
 impl From<ActionParams> for Call {
 	fn from(p: ActionParams) -> Self {
-		match p.call_type {
-			CallType::DelegateCall | CallType::CallCode => Call {
+		match p.action_type {
+			ActionType::DelegateCall | ActionType::CallCode => Call {
 				from: p.address,
 				to: p.code_address,
 				value: p.value.value(),
 				gas: p.gas,
 				input: p.data.unwrap_or_else(Vec::new),
-				call_type: p.call_type,
+				call_type: CallType::try_from(p.action_type).ok().into(),
 			},
 			_ => Call {
 				from: p.sender,
@@ -85,7 +239,7 @@ impl From<ActionParams> for Call {
 				value: p.value.value(),
 				gas: p.gas,
 				input: p.data.unwrap_or_else(Vec::new),
-				call_type: p.call_type,
+				call_type: CallType::try_from(p.action_type).ok().into(),
 			},
 		}
 	}
@@ -113,6 +267,9 @@ pub struct Create {
 	pub gas: U256,
 	/// The init code.
 	pub init: Bytes,
+	/// Creation method (CREATE vs CREATE2).
+	#[rlp(default)]
+	pub creation_method: Option<CreationMethod>,
 }
 
 impl From<ActionParams> for Create {
@@ -122,6 +279,7 @@ impl From<ActionParams> for Create {
 			value: p.value.value(),
 			gas: p.gas,
 			init: p.code.map_or_else(Vec::new, |c| (*c).clone()),
+			creation_method: CreationMethod::try_from(p.action_type).ok().into(),
 		}
 	}
 }
@@ -429,3 +587,132 @@ pub struct VMTrace {
 	/// Thre is a 1:1 correspondance between these and a CALL/CREATE/CALLCODE/DELEGATECALL instruction.
 	pub subs: Vec<VMTrace>,
 }
+
+#[cfg(test)]
+mod tests {
+	use rlp::{RlpStream, Encodable};
+	use rlp_derive::{RlpEncodable, RlpDecodable};
+	use super::{Address, Bytes, Call, CallType, Create, CreationMethod, U256};
+
+	#[test]
+	fn test_call_type_backwards_compatibility() {
+		// Call type in version < 2.7.
+		#[derive(Debug, Clone, PartialEq, RlpEncodable)]
+		struct OldCall {
+			from: Address,
+			to: Address,
+			value: U256,
+			gas: U256,
+			input: Bytes,
+			call_type: OldCallType,
+		}
+
+		// CallType type in version < 2.7.
+		#[allow(dead_code)]
+		#[derive(Debug, PartialEq, Clone)]
+		enum OldCallType {
+			None,
+			Call,
+			CallCode,
+			DelegateCall,
+			StaticCall,
+		}
+
+		// CallType rlp encoding in version < 2.7.
+		impl Encodable for OldCallType {
+			fn rlp_append(&self, s: &mut RlpStream) {
+				let v = match *self {
+					OldCallType::None => 0u32,
+					OldCallType::Call => 1,
+					OldCallType::CallCode => 2,
+					OldCallType::DelegateCall => 3,
+					OldCallType::StaticCall => 4,
+				};
+				Encodable::rlp_append(&v, s);
+			}
+		}
+
+		let old_call = OldCall {
+			from: Address::from_low_u64_be(1),
+			to: Address::from_low_u64_be(2),
+			value: U256::from(3),
+			gas: U256::from(4),
+			input: vec![5],
+			call_type: OldCallType::DelegateCall,
+		};
+
+		let old_encoded = rlp::encode(&old_call);
+
+		let new_call = Call {
+			from: Address::from_low_u64_be(1),
+			to: Address::from_low_u64_be(2),
+			value: U256::from(3),
+			gas: U256::from(4),
+			input: vec![5],
+			call_type: Some(CallType::DelegateCall).into(),
+		};
+
+		// `old_call` should be deserialized successfully into `new_call`
+		assert_eq!(rlp::decode(&old_encoded), Ok(new_call.clone()));
+		// test a roundtrip with `Some` `call_type`
+		let new_encoded = rlp::encode(&new_call);
+		assert_eq!(rlp::decode(&new_encoded), Ok(new_call));
+
+		// test a roundtrip with `None` `call_type`
+		let none_call = Call {
+			from: Address::from_low_u64_be(1),
+			to: Address::from_low_u64_be(2),
+			value: U256::from(3),
+			gas: U256::from(4),
+			input: vec![5],
+			call_type: None.into(),
+		};
+		let none_encoded = rlp::encode(&none_call);
+		assert_eq!(rlp::decode(&none_encoded), Ok(none_call));
+	}
+
+	#[test]
+	fn test_creation_method_backwards_compatibility() {
+		// Create type in version < 2.7.
+		#[derive(Debug, Clone, PartialEq, RlpEncodable, RlpDecodable)]
+		struct OldCreate {
+			from: Address,
+			value: U256,
+			gas: U256,
+			init: Bytes,
+		}
+
+		let old_create = OldCreate {
+			from: Address::from_low_u64_be(1),
+			value: U256::from(3),
+			gas: U256::from(4),
+			init: vec![5],
+		};
+
+		let old_encoded = rlp::encode(&old_create);
+		let new_create = Create {
+			from: Address::from_low_u64_be(1),
+			value: U256::from(3),
+			gas: U256::from(4),
+			init: vec![5],
+			creation_method: None,
+		};
+
+		// `old_create` should be deserialized successfully into `new_create`
+		assert_eq!(rlp::decode(&old_encoded), Ok(new_create.clone()));
+		// test a roundtrip with `None` `creation_method`
+		let new_encoded = rlp::encode(&new_create);
+		assert_eq!(rlp::decode(&new_encoded), Ok(new_create));
+
+		// test a roundtrip with `Some` `creation_method`
+		let some_create = Create {
+			from: Address::from_low_u64_be(1),
+			value: U256::from(3),
+			gas: U256::from(4),
+			init: vec![5],
+			creation_method: Some(CreationMethod::Create2),
+		};
+		let some_encoded = rlp::encode(&some_create);
+		assert_eq!(rlp::decode(&some_encoded), Ok(some_create));
+	}
+}
diff --git a/ethcore/types/Cargo.toml b/ethcore/types/Cargo.toml
index 376fe3407..275e2e027 100644
--- a/ethcore/types/Cargo.toml
+++ b/ethcore/types/Cargo.toml
@@ -22,7 +22,7 @@ unexpected = { path = "../../util/unexpected" }
 vm = { path = "../vm"}
 
 [dev-dependencies]
-rustc-hex = "1.0"
+rustc-hex = "2.0"
 
 [features]
 test-helpers = []
diff --git a/ethcore/types/src/encoded.rs b/ethcore/types/src/encoded.rs
index 1cf418742..a7c7b5c0c 100644
--- a/ethcore/types/src/encoded.rs
+++ b/ethcore/types/src/encoded.rs
@@ -26,7 +26,7 @@
 use block::Block as FullBlock;
 use ethereum_types::{H256, Bloom, U256, Address};
 use hash::keccak;
-use header::{Header as FullHeader};
+use header::Header as FullHeader;
 use parity_util_mem::MallocSizeOf;
 use rlp::{self, Rlp, RlpStream};
 use transaction::UnverifiedTransaction;
@@ -60,6 +60,15 @@ impl Header {
 	pub fn into_inner(self) -> Vec<u8> { self.0 }
 }
 
+impl std::fmt::LowerHex for Header {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		for byte in &self.0 {
+			write!(f, "{:02x}", byte)?;
+		}
+		Ok(())
+	}
+}
+
 // forwarders to borrowed view.
 impl Header {
 	/// Returns the header hash.
diff --git a/ethcore/types/src/errors/ethcore_error.rs b/ethcore/types/src/errors/ethcore_error.rs
index 93be62e69..1a99c65dc 100644
--- a/ethcore/types/src/errors/ethcore_error.rs
+++ b/ethcore/types/src/errors/ethcore_error.rs
@@ -21,7 +21,7 @@ use derive_more::{Display, From};
 use ethereum_types::{U256, U512};
 use ethtrie::TrieError;
 use parity_snappy::InvalidInput;
-use parity_crypto::publickey::{Error as EthPublicKeyCryptoError};
+use parity_crypto::publickey::Error as EthPublicKeyCryptoError;
 
 use errors::{BlockError, EngineError, ImportError, SnapshotError};
 use transaction::Error as TransactionError;
diff --git a/ethcore/types/src/header.rs b/ethcore/types/src/header.rs
index 87fe9a534..a36dca435 100644
--- a/ethcore/types/src/header.rs
+++ b/ethcore/types/src/header.rs
@@ -377,11 +377,11 @@ mod tests {
 	#[test]
 	fn test_header_seal_fields() {
 		// that's rlp of block header created with ethash engine.
-		let header_rlp = "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".from_hex().unwrap();
-		let mix_hash = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
-		let mix_hash_decoded = "a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
-		let nonce = "88ab4e252a7e8c2a23".from_hex().unwrap();
-		let nonce_decoded = "ab4e252a7e8c2a23".from_hex().unwrap();
+		let header_rlp: Vec<u8> = "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".from_hex().unwrap();
+		let mix_hash: Vec<u8> = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
+		let mix_hash_decoded: Vec<u8> = "a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
+		let nonce: Vec<u8> = "88ab4e252a7e8c2a23".from_hex().unwrap();
+		let nonce_decoded: Vec<u8> = "ab4e252a7e8c2a23".from_hex().unwrap();
 
 		let header: Header = rlp::decode(&header_rlp).expect("error decoding header");
 		let seal_fields = header.seal.clone();
@@ -398,7 +398,7 @@ mod tests {
 	#[test]
 	fn decode_and_encode_header() {
 		// that's rlp of block header created with ethash engine.
-		let header_rlp = "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".from_hex().unwrap();
+		let header_rlp: Vec<u8> = "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".from_hex().unwrap();
 
 		let header: Header = rlp::decode(&header_rlp).expect("error decoding header");
 		let encoded_header = rlp::encode(&header);
@@ -410,7 +410,7 @@ mod tests {
 	fn reject_header_with_large_timestamp() {
 		// that's rlp of block header created with ethash engine.
 		// The encoding contains a large timestamp (295147905179352825856)
-		let header_rlp = "f901f9a0d405da4e66f1445d455195229624e133f5baafe72b5cf7b3c36c12c8146e98b7a01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347948888f1f195afa192cfee860698584c030f4c9db1a05fb2b4bfdef7b314451cb138a534d225c922fc0e5fbe25e451142732c3e25c25a088d2ec6b9860aae1a2c3b299f72b6a5d70d7f7ba4722c78f2c49ba96273c2158a007c6fdfa8eea7e86b81f5b0fc0f78f90cc19f4aa60d323151e0cac660199e9a1b90100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008302008003832fefba82524d891000000000000000000080a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd88ab4e252a7e8c2a23".from_hex().unwrap();
+		let header_rlp: Vec<u8> = "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".from_hex().unwrap();
 
 		// This should fail decoding timestamp
 		let header: Result<Header, _> = rlp::decode(&header_rlp);
diff --git a/ethcore/types/src/lib.rs b/ethcore/types/src/lib.rs
index 07bd7b127..5b664e9dc 100644
--- a/ethcore/types/src/lib.rs
+++ b/ethcore/types/src/lib.rs
@@ -42,8 +42,8 @@ extern crate derive_more;
 extern crate keccak_hash as hash;
 extern crate parity_bytes as bytes;
 extern crate patricia_trie_ethereum as ethtrie;
-extern crate rlp;
 extern crate parity_snappy;
+extern crate rlp;
 extern crate unexpected;
 
 #[macro_use]
@@ -51,12 +51,12 @@ extern crate rlp_derive;
 extern crate parity_util_mem;
 extern crate parity_util_mem as malloc_size_of;
 
-#[macro_use]
-pub mod views;
-
 #[cfg(test)]
 extern crate rustc_hex;
 
+#[macro_use]
+pub mod views;
+
 pub mod account_diff;
 pub mod ancestry_action;
 pub mod basic_account;
diff --git a/ethcore/types/src/receipt.rs b/ethcore/types/src/receipt.rs
index 82c4763b1..b630c048a 100644
--- a/ethcore/types/src/receipt.rs
+++ b/ethcore/types/src/receipt.rs
@@ -170,13 +170,15 @@ pub struct LocalizedReceipt {
 
 #[cfg(test)]
 mod tests {
+	use std::str::FromStr;
+
 	use super::{Receipt, TransactionOutcome, Address, H256};
 	use log_entry::LogEntry;
-	use std::str::FromStr;
+	use rustc_hex::FromHex;
 
 	#[test]
 	fn test_no_state_root() {
-		let expected = ::rustc_hex::FromHex::from_hex("f9014183040caeb9010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000f838f794dcf421d093428b096ca501a7cd1a740855a7976fc0a00000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let expected: Vec<u8> = FromHex::from_hex("f9014183040caeb9010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000f838f794dcf421d093428b096ca501a7cd1a740855a7976fc0a00000000000000000000000000000000000000000000000000000000000000000").unwrap();
 		let r = Receipt::new(
 			TransactionOutcome::Unknown,
 			0x40cae.into(),
@@ -191,7 +193,7 @@ mod tests {
 
 	#[test]
 	fn test_basic() {
-		let expected = ::rustc_hex::FromHex::from_hex("f90162a02f697d671e9ae4ee24a43c4b0d7e15f1cb4ba6de1561120d43b9a4e8c4a8a6ee83040caeb9010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000f838f794dcf421d093428b096ca501a7cd1a740855a7976fc0a00000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let expected: Vec<u8> = FromHex::from_hex("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").unwrap();
 		let r = Receipt::new(
 			TransactionOutcome::StateRoot(H256::from_str("2f697d671e9ae4ee24a43c4b0d7e15f1cb4ba6de1561120d43b9a4e8c4a8a6ee").unwrap()),
 			0x40cae.into(),
@@ -201,15 +203,15 @@ mod tests {
 				data: vec![0u8; 32]
 			}]
 		);
-		let encoded = ::rlp::encode(&r);
+		let encoded = rlp::encode(&r);
 		assert_eq!(&encoded[..], &expected[..]);
-		let decoded: Receipt = ::rlp::decode(&encoded).expect("decoding receipt failed");
+		let decoded: Receipt = rlp::decode(&encoded).expect("decoding receipt failed");
 		assert_eq!(decoded, r);
 	}
 
 	#[test]
 	fn test_status_code() {
-		let expected = ::rustc_hex::FromHex::from_hex("f901428083040caeb9010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000f838f794dcf421d093428b096ca501a7cd1a740855a7976fc0a00000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let expected: Vec<u8> = FromHex::from_hex("f901428083040caeb9010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000f838f794dcf421d093428b096ca501a7cd1a740855a7976fc0a00000000000000000000000000000000000000000000000000000000000000000").unwrap();
 		let r = Receipt::new(
 			TransactionOutcome::StatusCode(0),
 			0x40cae.into(),
@@ -219,9 +221,9 @@ mod tests {
 				data: vec![0u8; 32]
 			}]
 		);
-		let encoded = ::rlp::encode(&r);
+		let encoded = rlp::encode(&r);
 		assert_eq!(&encoded[..], &expected[..]);
-		let decoded: Receipt = ::rlp::decode(&encoded).expect("decoding receipt failed");
+		let decoded: Receipt = rlp::decode(&encoded).expect("decoding receipt failed");
 		assert_eq!(decoded, r);
 	}
 }
diff --git a/ethcore/types/src/transaction/transaction.rs b/ethcore/types/src/transaction/transaction.rs
index c59050f11..0fe4bb67a 100644
--- a/ethcore/types/src/transaction/transaction.rs
+++ b/ethcore/types/src/transaction/transaction.rs
@@ -548,14 +548,16 @@ impl From<SignedTransaction> for PendingTransaction {
 
 #[cfg(test)]
 mod tests {
+	use std::str::FromStr;
+
 	use super::*;
 	use ethereum_types::{U256, Address};
 	use hash::keccak;
-	use std::str::FromStr;
+	use rustc_hex::FromHex;
 
 	#[test]
 	fn sender_test() {
-		let bytes = ::rustc_hex::FromHex::from_hex("f85f800182520894095e7baea6a6c7c4c2dfeb977efac326af552d870a801ba048b55bfa915ac795c431978d8a6a992b628d557da5ff759b307d495a36649353a0efffd310ac743f371de3b9f7f9cb56c0b28ad43601b4ab949f53faa07bd2c804").unwrap();
+		let bytes: Vec<u8> = FromHex::from_hex("f85f800182520894095e7baea6a6c7c4c2dfeb977efac326af552d870a801ba048b55bfa915ac795c431978d8a6a992b628d557da5ff759b307d495a36649353a0efffd310ac743f371de3b9f7f9cb56c0b28ad43601b4ab949f53faa07bd2c804").unwrap();
 		let t: UnverifiedTransaction = rlp::decode(&bytes).expect("decoding UnverifiedTransaction failed");
 		assert_eq!(t.data, b"");
 		assert_eq!(t.gas, U256::from(0x5208u64));
@@ -675,11 +677,9 @@ mod tests {
 
 	#[test]
 	fn should_agree_with_vitalik() {
-		use rustc_hex::FromHex;
-
 		let test_vector = |tx_data: &str, address: &'static str| {
-			let signed = rlp::decode(&FromHex::from_hex(tx_data).unwrap()).expect("decoding tx data failed");
-			let signed = SignedTransaction::new(signed).unwrap();
+			let bytes = rlp::decode(&tx_data.from_hex::<Vec<u8>>().unwrap()).expect("decoding tx data failed");
+			let signed = SignedTransaction::new(bytes).unwrap();
 			assert_eq!(signed.sender(), Address::from_str(&address[2..]).unwrap());
 			println!("chainid: {:?}", signed.chain_id());
 		};
diff --git a/ethcore/types/src/views/block.rs b/ethcore/types/src/views/block.rs
index b9e23ab3b..5666a1031 100644
--- a/ethcore/types/src/views/block.rs
+++ b/ethcore/types/src/views/block.rs
@@ -183,7 +183,7 @@ mod tests {
 	#[test]
 	fn test_block_view() {
 		// that's rlp of block created with ethash engine.
-		let rlp = "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".from_hex().unwrap();
+		let rlp: Vec<u8> = "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".from_hex().unwrap();
 
 		let view = view!(BlockView, &rlp);
 		assert_eq!(view.hash(), H256::from_str("2c9747e804293bd3f1a986484343f23bc88fd5be75dfe9d5c2860aff61e6f259").unwrap());
diff --git a/ethcore/types/src/views/body.rs b/ethcore/types/src/views/body.rs
index f8840f8d3..dbc6e8801 100644
--- a/ethcore/types/src/views/body.rs
+++ b/ethcore/types/src/views/body.rs
@@ -167,7 +167,7 @@ mod tests {
 	#[test]
 	fn test_block_view() {
 		// that's rlp of block created with ethash engine.
-		let rlp = "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".from_hex().unwrap();
+		let rlp: Vec<u8> = "f90261f901f9a0d405da4e66f1445d455195229624e133f5baafe72b5cf7b3c36c12c8146e98b7a01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347948888f1f195afa192cfee860698584c030f4c9db1a05fb2b4bfdef7b314451cb138a534d225c922fc0e5fbe25e451142732c3e25c25a088d2ec6b9860aae1a2c3b299f72b6a5d70d7f7ba4722c78f2c49ba96273c2158a007c6fdfa8eea7e86b81f5b0fc0f78f90cc19f4aa60d323151e0cac660199e9a1b90100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008302008003832fefba82524d84568e932a80a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd88ab4e252a7e8c2a23f862f86002018304cb2f94ec0e71ad0a90ffe1909d27dac207f7680abba42d01801ba03a347e72953c860f32b1eb2c78a680d8734b2ea08085d949d729479796f218d5a047ea6239d9e31ccac8af3366f5ca37184d26e7646e3191a3aeb81c4cf74de500c0".from_hex().unwrap();
 		let body = block_to_body(&rlp);
 		let view = view!(BodyView, &body);
 		assert_eq!(view.transactions_count(), 1);
diff --git a/ethcore/types/src/views/header.rs b/ethcore/types/src/views/header.rs
index cb148f564..0e52dd8b1 100644
--- a/ethcore/types/src/views/header.rs
+++ b/ethcore/types/src/views/header.rs
@@ -127,9 +127,9 @@ mod tests {
 	#[test]
 	fn test_header_view() {
 		// that's rlp of block header created with ethash engine.
-		let rlp = "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".from_hex().unwrap();
-		let mix_hash = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
-		let nonce = "88ab4e252a7e8c2a23".from_hex().unwrap();
+		let rlp: Vec<u8> = "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".from_hex().unwrap();
+		let mix_hash: Vec<u8> = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
+		let nonce: Vec<u8> = "88ab4e252a7e8c2a23".from_hex().unwrap();
 
 		let view = view!(HeaderView, &rlp);
 		assert_eq!(view.hash(), H256::from_str("2c9747e804293bd3f1a986484343f23bc88fd5be75dfe9d5c2860aff61e6f259").unwrap());
diff --git a/ethcore/types/src/views/transaction.rs b/ethcore/types/src/views/transaction.rs
index ef3dd6c5b..67fcd31f1 100644
--- a/ethcore/types/src/views/transaction.rs
+++ b/ethcore/types/src/views/transaction.rs
@@ -90,14 +90,14 @@ mod tests {
 
 	#[test]
 	fn test_transaction_view() {
-		let rlp = "f87c80018261a894095e7baea6a6c7c4c2dfeb977efac326af552d870a9d00000000000000000000000000000000000000000000000000000000001ba048b55bfa915ac795c431978d8a6a992b628d557da5ff759b307d495a36649353a0efffd310ac743f371de3b9f7f9cb56c0b28ad43601b4ab949f53faa07bd2c804".from_hex().unwrap();
+		let rlp: Vec<u8> = "f87c80018261a894095e7baea6a6c7c4c2dfeb977efac326af552d870a9d00000000000000000000000000000000000000000000000000000000001ba048b55bfa915ac795c431978d8a6a992b628d557da5ff759b307d495a36649353a0efffd310ac743f371de3b9f7f9cb56c0b28ad43601b4ab949f53faa07bd2c804".from_hex().unwrap();
 
 		let view = view!(TransactionView, &rlp);
 		assert_eq!(view.nonce(), 0.into());
 		assert_eq!(view.gas_price(), 1.into());
 		assert_eq!(view.gas(), 0x61a8.into());
 		assert_eq!(view.value(), 0xa.into());
-		assert_eq!(view.data(), "0000000000000000000000000000000000000000000000000000000000".from_hex().unwrap());
+		assert_eq!(view.data(), "0000000000000000000000000000000000000000000000000000000000".from_hex::<Vec<u8>>().unwrap());
 		assert_eq!(view.r(), "48b55bfa915ac795c431978d8a6a992b628d557da5ff759b307d495a36649353".into());
 		assert_eq!(view.s(), "efffd310ac743f371de3b9f7f9cb56c0b28ad43601b4ab949f53faa07bd2c804".into());
 		assert_eq!(view.v(), 0x1b);
diff --git a/ethcore/verification/src/queue/kind.rs b/ethcore/verification/src/queue/kind.rs
index acea47237..546df2d5a 100644
--- a/ethcore/verification/src/queue/kind.rs
+++ b/ethcore/verification/src/queue/kind.rs
@@ -62,7 +62,14 @@ pub trait Kind: 'static + Sized + Send + Sync {
 	type Verified: Sized + Send + BlockLike + MallocSizeOf;
 
 	/// Attempt to create the `Unverified` item from the input.
-	fn create(input: Self::Input, engine: &dyn Engine, check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)>;
+	///
+	/// The return type is quite complex because in some scenarios the input
+	/// is needed (typically for BlockError) to get the raw block bytes without cloning them
+	fn create(
+		input: Self::Input,
+		engine: &dyn Engine,
+		check_seal: bool
+	) -> Result<Self::Unverified, (Error, Option<Self::Input>)>;
 
 	/// Attempt to verify the `Unverified` item using the given engine.
 	fn verify(unverified: Self::Unverified, engine: &dyn Engine, check_seal: bool) -> Result<Self::Verified, Error>;
@@ -91,16 +98,20 @@ pub mod blocks {
 		type Unverified = Unverified;
 		type Verified = PreverifiedBlock;
 
-		fn create(input: Self::Input, engine: &dyn Engine, check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)> {
+		fn create(
+			input: Self::Input,
+			engine: &dyn Engine,
+			check_seal: bool
+		) -> Result<Self::Unverified, (Error, Option<Self::Input>)> {
 			match verify_block_basic(&input, engine, check_seal) {
 				Ok(()) => Ok(input),
 				Err(Error::Block(BlockError::TemporarilyInvalid(oob))) => {
 					debug!(target: "client", "Block received too early {}: {:?}", input.hash(), oob);
-					Err((input, BlockError::TemporarilyInvalid(oob).into()))
+					Err((BlockError::TemporarilyInvalid(oob).into(), Some(input)))
 				},
 				Err(e) => {
 					warn!(target: "client", "Stage 1 block verification failed for {}: {:?}", input.hash(), e);
-					Err((input, e))
+					Err((e, Some(input)))
 				}
 			}
 		}
@@ -127,11 +138,11 @@ pub mod blocks {
 		}
 
 		fn parent_hash(&self) -> H256 {
-			self.header.parent_hash().clone()
+			*self.header.parent_hash()
 		}
 
 		fn difficulty(&self) -> U256 {
-			self.header.difficulty().clone()
+			*self.header.difficulty()
 		}
 	}
 
@@ -145,11 +156,11 @@ pub mod blocks {
 		}
 
 		fn parent_hash(&self) -> H256 {
-			self.header.parent_hash().clone()
+			*self.header.parent_hash()
 		}
 
 		fn difficulty(&self) -> U256 {
-			self.header.difficulty().clone()
+			*self.header.difficulty()
 		}
 	}
 }
@@ -170,8 +181,8 @@ pub mod headers {
 	impl BlockLike for Header {
 		fn hash(&self) -> H256 { self.hash() }
 		fn raw_hash(&self) -> H256 { self.hash() }
-		fn parent_hash(&self) -> H256 { self.parent_hash().clone() }
-		fn difficulty(&self) -> U256 { self.difficulty().clone() }
+		fn parent_hash(&self) -> H256 { *self.parent_hash() }
+		fn difficulty(&self) -> U256 { *self.difficulty() }
 	}
 
 	/// A mode for verifying headers.
@@ -182,19 +193,23 @@ pub mod headers {
 		type Unverified = Header;
 		type Verified = Header;
 
-		fn create(input: Self::Input, engine: &dyn Engine, check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)> {
+		fn create(
+			input: Self::Input,
+			engine: &dyn Engine,
+			check_seal: bool
+		) -> Result<Self::Unverified, (Error, Option<Self::Input>)> {
 			let res = verify_header_params(&input, engine, check_seal)
 				.and_then(|_| verify_header_time(&input));
 
 			match res {
 				Ok(_) => Ok(input),
-				Err(err) => Err((input, err))
+				Err(e) => Err((e, Some(input))),
 			}
 		}
 
 		fn verify(unverified: Self::Unverified, engine: &dyn Engine, check_seal: bool) -> Result<Self::Verified, Error> {
 			match check_seal {
-				true => engine.verify_block_unordered(&unverified,).map(|_| unverified),
+				true => engine.verify_block_unordered(&unverified).map(|_| unverified),
 				false => Ok(unverified),
 			}
 		}
diff --git a/ethcore/verification/src/queue/mod.rs b/ethcore/verification/src/queue/mod.rs
index 64422573f..31d205c79 100644
--- a/ethcore/verification/src/queue/mod.rs
+++ b/ethcore/verification/src/queue/mod.rs
@@ -467,30 +467,33 @@ impl<K: Kind, C> VerificationQueue<K, C> {
 	}
 
 	/// Add a block to the queue.
-	pub fn import(&self, input: K::Input) -> Result<H256, (K::Input, Error)> {
+	//
+	// TODO: #11403 - rework `EthcoreError::Block` to include raw bytes of the error cause
+	pub fn import(&self, input: K::Input) -> Result<H256, (Error, Option<K::Input>)> {
 		let hash = input.hash();
 		let raw_hash = input.raw_hash();
 		{
 			if self.processing.read().contains_key(&hash) {
-				return Err((input, Error::Import(ImportError::AlreadyQueued).into()));
+				return Err((Error::Import(ImportError::AlreadyQueued), Some(input)));
 			}
 
 			let mut bad = self.verification.bad.lock();
 			if bad.contains(&hash) || bad.contains(&raw_hash)  {
-				return Err((input, Error::Import(ImportError::KnownBad).into()));
+				return Err((Error::Import(ImportError::KnownBad), Some(input)));
 			}
 
 			if bad.contains(&input.parent_hash()) {
 				bad.insert(hash);
-				return Err((input, Error::Import(ImportError::KnownBad).into()));
+				return Err((Error::Import(ImportError::KnownBad), Some(input)));
 			}
 		}
 
 		match K::create(input, &*self.engine, self.verification.check_seal) {
 			Ok(item) => {
+				if self.processing.write().insert(hash, item.difficulty()).is_some() {
+					return Err((Error::Import(ImportError::AlreadyQueued), None));
+				}
 				self.verification.sizes.unverified.fetch_add(item.malloc_size_of(), AtomicOrdering::SeqCst);
-
-				self.processing.write().insert(hash, item.difficulty());
 				{
 					let mut td = self.total_difficulty.write();
 					*td = *td + item.difficulty();
@@ -499,7 +502,7 @@ impl<K: Kind, C> VerificationQueue<K, C> {
 				self.more_to_verify.notify_all();
 				Ok(hash)
 			},
-			Err((input, err)) => {
+			Err((err, input)) => {
 				match err {
 					// Don't mark future blocks as bad.
 					Error::Block(BlockError::TemporarilyInvalid(_)) => {},
@@ -517,7 +520,7 @@ impl<K: Kind, C> VerificationQueue<K, C> {
 						self.verification.bad.lock().insert(hash);
 					}
 				}
-				Err((input, err))
+				Err((err, input))
 			}
 		}
 	}
@@ -582,7 +585,7 @@ impl<K: Kind, C> VerificationQueue<K, C> {
 		let count = cmp::min(max, verified.len());
 		let result = verified.drain(..count).collect::<Vec<_>>();
 
-		let drained_size = result.iter().map(MallocSizeOfExt::malloc_size_of).fold(0, |a, c| a + c);
+		let drained_size = result.iter().map(MallocSizeOfExt::malloc_size_of).sum();
 		self.verification.sizes.verified.fetch_sub(drained_size, AtomicOrdering::SeqCst);
 
 		self.ready_signal.reset();
@@ -636,7 +639,7 @@ impl<K: Kind, C> VerificationQueue<K, C> {
 
 	/// Get the total difficulty of all the blocks in the queue.
 	pub fn total_difficulty(&self) -> U256 {
-		self.total_difficulty.read().clone()
+		*self.total_difficulty.read()
 	}
 
 	/// Get the current number of working verifiers.
@@ -806,9 +809,9 @@ mod tests {
 
 		let duplicate_import = queue.import(new_unverified(get_good_dummy_block()));
 		match duplicate_import {
-			Err((_, e)) => {
+			Err(e) => {
 				match e {
-					EthcoreError::Import(ImportError::AlreadyQueued) => {},
+					(EthcoreError::Import(ImportError::AlreadyQueued), _) => {},
 					_ => { panic!("must return AlreadyQueued error"); }
 				}
 			}
diff --git a/ethcore/vm/src/action_params.rs b/ethcore/vm/src/action_params.rs
index e98e214cd..da06fb3f3 100644
--- a/ethcore/vm/src/action_params.rs
+++ b/ethcore/vm/src/action_params.rs
@@ -20,7 +20,7 @@ use bytes::Bytes;
 use hash::{keccak, KECCAK_EMPTY};
 use ethjson;
 
-use call_type::CallType;
+use action_type::ActionType;
 
 use std::sync::Arc;
 
@@ -88,8 +88,8 @@ pub struct ActionParams {
 	pub code_version: U256,
 	/// Input data.
 	pub data: Option<Bytes>,
-	/// Type of call
-	pub call_type: CallType,
+	/// Type of action (e.g. CALL, DELEGATECALL, CREATE, etc.)
+	pub action_type: ActionType,
 	/// Param types encoding
 	pub params_type: ParamsType,
 }
@@ -109,7 +109,7 @@ impl Default for ActionParams {
 			code: None,
 			code_version: U256::zero(),
 			data: None,
-			call_type: CallType::None,
+			action_type: ActionType::Create,
 			params_type: ParamsType::Separate,
 		}
 	}
@@ -130,7 +130,7 @@ impl From<ethjson::vm::Transaction> for ActionParams {
 			gas: t.gas.into(),
 			gas_price: t.gas_price.into(),
 			value: ActionValue::Transfer(t.value.into()),
-			call_type: match address.is_zero() { true => CallType::None, false => CallType::Call },	// TODO @debris is this correct?
+			action_type: ActionType::Call,
 			params_type: ParamsType::Separate,
 		}
 	}
diff --git a/ethcore/vm/src/call_type.rs b/ethcore/vm/src/action_type.rs
similarity index 66%
rename from ethcore/vm/src/call_type.rs
rename to ethcore/vm/src/action_type.rs
index 1bb06d86c..2696ba598 100644
--- a/ethcore/vm/src/call_type.rs
+++ b/ethcore/vm/src/action_type.rs
@@ -14,47 +14,51 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-//! EVM call types.
+//! EVM action types.
 
 use rlp::{Encodable, Decodable, DecoderError, RlpStream, Rlp};
 
-/// The type of the call-like instruction.
+/// The type of the instruction.
 #[derive(Debug, PartialEq, Clone)]
-pub enum CallType {
-	/// Not a CALL.
-	None,
+pub enum ActionType {
+	/// CREATE.
+	Create,
 	/// CALL.
 	Call,
 	/// CALLCODE.
 	CallCode,
 	/// DELEGATECALL.
 	DelegateCall,
-	/// STATICCALL
+	/// STATICCALL.
 	StaticCall,
+	/// CREATE2.
+	Create2
 }
 
-impl Encodable for CallType {
+impl Encodable for ActionType {
 	fn rlp_append(&self, s: &mut RlpStream) {
 		let v = match *self {
-			CallType::None => 0u32,
-			CallType::Call => 1,
-			CallType::CallCode => 2,
-			CallType::DelegateCall => 3,
-			CallType::StaticCall => 4,
+			ActionType::Create => 0u32,
+			ActionType::Call => 1,
+			ActionType::CallCode => 2,
+			ActionType::DelegateCall => 3,
+			ActionType::StaticCall => 4,
+			ActionType::Create2 => 5,
 		};
 		Encodable::rlp_append(&v, s);
 	}
 }
 
-impl Decodable for CallType {
+impl Decodable for ActionType {
 	fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
 		rlp.as_val().and_then(|v| Ok(match v {
-			0u32 => CallType::None,
-			1 => CallType::Call,
-			2 => CallType::CallCode,
-			3 => CallType::DelegateCall,
-			4 => CallType::StaticCall,
-			_ => return Err(DecoderError::Custom("Invalid value of CallType item")),
+			0u32 => ActionType::Create,
+			1 => ActionType::Call,
+			2 => ActionType::CallCode,
+			3 => ActionType::DelegateCall,
+			4 => ActionType::StaticCall,
+			5 => ActionType::Create2,
+			_ => return Err(DecoderError::Custom("Invalid value of ActionType item")),
 		}))
 	}
 }
@@ -62,11 +66,11 @@ impl Decodable for CallType {
 #[cfg(test)]
 mod tests {
 	use rlp::*;
-	use super::CallType;
+	use super::ActionType;
 
 	#[test]
 	fn encode_call_type() {
-		let ct = CallType::Call;
+		let ct = ActionType::Call;
 
 		let mut s = RlpStream::new_list(2);
 		s.append(&ct);
@@ -78,9 +82,9 @@ mod tests {
 
 	#[test]
 	fn should_encode_and_decode_call_type() {
-		let original = CallType::Call;
+		let original = ActionType::Call;
 		let encoded = encode(&original);
-		let decoded = decode(&encoded).expect("failure decoding CallType");
+		let decoded = decode(&encoded).expect("failure decoding ActionType");
 		assert_eq!(original, decoded);
 	}
 }
diff --git a/ethcore/vm/src/ext.rs b/ethcore/vm/src/ext.rs
index 0349e3dfa..656831cdc 100644
--- a/ethcore/vm/src/ext.rs
+++ b/ethcore/vm/src/ext.rs
@@ -19,7 +19,7 @@
 use std::sync::Arc;
 use ethereum_types::{U256, H256, Address};
 use bytes::Bytes;
-use call_type::CallType;
+use action_type::ActionType;
 use env_info::EnvInfo;
 use schedule::Schedule;
 use return_data::ReturnData;
@@ -115,7 +115,7 @@ pub trait Ext {
 		value: Option<U256>,
 		data: &[u8],
 		code_address: &Address,
-		call_type: CallType,
+		call_type: ActionType,
 		trap: bool
 	) -> ::std::result::Result<MessageCallResult, TrapKind>;
 
diff --git a/ethcore/vm/src/lib.rs b/ethcore/vm/src/lib.rs
index 1576dda04..6c5ed98fd 100644
--- a/ethcore/vm/src/lib.rs
+++ b/ethcore/vm/src/lib.rs
@@ -24,7 +24,7 @@ extern crate keccak_hash as hash;
 extern crate patricia_trie_ethereum as ethtrie;
 
 mod action_params;
-mod call_type;
+mod action_type;
 mod env_info;
 mod schedule;
 mod ext;
@@ -34,7 +34,7 @@ mod error;
 pub mod tests;
 
 pub use action_params::{ActionParams, ActionValue, ParamsType};
-pub use call_type::CallType;
+pub use action_type::ActionType;
 pub use env_info::{EnvInfo, LastHashes};
 pub use schedule::{Schedule, VersionedSchedule, CleanDustMode, WasmCosts};
 pub use ext::{Ext, MessageCallResult, ContractCreateResult, CreateContractAddress};
diff --git a/ethcore/vm/src/tests.rs b/ethcore/vm/src/tests.rs
index d03350409..bdca9bbf3 100644
--- a/ethcore/vm/src/tests.rs
+++ b/ethcore/vm/src/tests.rs
@@ -20,7 +20,7 @@ use std::collections::{HashMap, HashSet};
 use ethereum_types::{U256, H256, Address};
 use bytes::Bytes;
 use {
-	CallType, Schedule, EnvInfo,
+	ActionType, Schedule, EnvInfo,
 	ReturnData, Ext, ContractCreateResult, MessageCallResult,
 	CreateContractAddress, Result, GasLeft,
 };
@@ -185,7 +185,7 @@ impl Ext for FakeExt {
 		value: Option<U256>,
 		data: &[u8],
 		code_address: &Address,
-		_call_type: CallType,
+		_call_type: ActionType,
 		_trap: bool,
 	) -> ::std::result::Result<MessageCallResult, TrapKind> {
 		self.calls.insert(FakeCall {
diff --git a/ethcore/wasm/src/runtime.rs b/ethcore/wasm/src/runtime.rs
index 972870bfd..3350e15bd 100644
--- a/ethcore/wasm/src/runtime.rs
+++ b/ethcore/wasm/src/runtime.rs
@@ -16,7 +16,7 @@
 
 use std::cmp;
 use ethereum_types::{BigEndianHash, U256, H256, Address};
-use vm::{self, CallType};
+use vm::{self, ActionType};
 use wasmi::{self, MemoryRef, RuntimeArgs, RuntimeValue, Error as InterpreterError, Trap, TrapKind};
 use super::panic_payload;
 
@@ -384,7 +384,7 @@ impl<'a> Runtime<'a> {
 	fn do_call(
 		&mut self,
 		use_val: bool,
-		call_type: CallType,
+		call_type: ActionType,
 		args: RuntimeArgs,
 	)
 		-> Result<RuntimeValue>
@@ -445,8 +445,8 @@ impl<'a> Runtime<'a> {
 
 		let call_result = self.ext.call(
 			&gas.into(),
-			match call_type { CallType::DelegateCall => &self.context.sender, _ => &self.context.address },
-			match call_type { CallType::Call | CallType::StaticCall => &address, _ => &self.context.address },
+			match call_type { ActionType::DelegateCall => &self.context.sender, _ => &self.context.address },
+			match call_type { ActionType::Call | ActionType::StaticCall => &address, _ => &self.context.address },
 			val,
 			&payload,
 			&address,
@@ -487,17 +487,17 @@ impl<'a> Runtime<'a> {
 
 	/// Message call
 	fn ccall(&mut self, args: RuntimeArgs) -> Result<RuntimeValue> {
-		self.do_call(true, CallType::Call, args)
+		self.do_call(true, ActionType::Call, args)
 	}
 
 	/// Delegate call
 	fn dcall(&mut self, args: RuntimeArgs) -> Result<RuntimeValue> {
-		self.do_call(false, CallType::DelegateCall, args)
+		self.do_call(false, ActionType::DelegateCall, args)
 	}
 
 	/// Static call
 	fn scall(&mut self, args: RuntimeArgs) -> Result<RuntimeValue> {
-		self.do_call(false, CallType::StaticCall, args)
+		self.do_call(false, ActionType::StaticCall, args)
 	}
 
 	fn return_address_ptr(&mut self, ptr: u32, val: Address) -> Result<()>
diff --git a/evmbin/src/main.rs b/evmbin/src/main.rs
index 4edee5f0f..4e6f637d4 100644
--- a/evmbin/src/main.rs
+++ b/evmbin/src/main.rs
@@ -45,7 +45,7 @@ use ethereum_types::{U256, Address};
 use ethcore::{json_tests, test_helpers::TrieSpec};
 use spec;
 use serde::Deserialize;
-use vm::{ActionParams, CallType};
+use vm::{ActionParams, ActionType};
 
 mod info;
 mod display;
@@ -314,7 +314,7 @@ fn run_call<T: Informant>(args: Args, informant: T) {
 	}
 
 	let mut params = ActionParams::default();
-	params.call_type = if code.is_none() { CallType::Call } else { CallType::None };
+	params.action_type = if code.is_none() { ActionType::Call } else { ActionType::Create };
 	params.code = code.map(Arc::new);
 	params.code_address = to;
 	params.address = to;
diff --git a/ipfs/Cargo.toml b/ipfs/Cargo.toml
index adb42f9e5..4d35547aa 100644
--- a/ipfs/Cargo.toml
+++ b/ipfs/Cargo.toml
@@ -9,7 +9,6 @@ edition = "2018"
 [dependencies]
 client-traits = { path = "../ethcore/client-traits" }
 common-types = { path = "../ethcore/types" }
-ethcore = { path = "../ethcore" }
 bytes = { package = "parity-bytes", version = "0.1"}
 ethereum-types = "0.8.0"
 jsonrpc-core = "14.0.3"
diff --git a/miner/local-store/Cargo.toml b/miner/local-store/Cargo.toml
index 806926ef0..10ce14517 100644
--- a/miner/local-store/Cargo.toml
+++ b/miner/local-store/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 [dependencies]
 common-types = { path = "../../ethcore/types" }
 ethcore-io = { path = "../../util/io" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 rlp = "0.4.0"
 serde = "1.0"
@@ -18,4 +18,4 @@ serde_json = "1.0"
 [dev-dependencies]
 ethkey = { path = "../../accounts/ethkey" }
 parity-crypto = { version = "0.4.2", features = ["publickey"] }
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
diff --git a/rpc/src/v1/tests/mocked/traces.rs b/rpc/src/v1/tests/mocked/traces.rs
index aee34a49f..0ae9e6195 100644
--- a/rpc/src/v1/tests/mocked/traces.rs
+++ b/rpc/src/v1/tests/mocked/traces.rs
@@ -23,7 +23,7 @@ use ethcore::test_helpers::TestBlockChainClient;
 use ethereum_types::{Address, H256};
 
 use types::transaction::CallError;
-use vm::CallType;
+use trace::trace::CallType;
 
 use jsonrpc_core::IoHandler;
 use v1::tests::helpers::{TestMinerService};
@@ -44,7 +44,7 @@ fn io() -> Tester {
 			value: 0x1.into(),
 			gas: 0x100.into(),
 			input: vec![1, 2, 3],
-			call_type: CallType::Call,
+			call_type: Some(CallType::Call).into(),
 		}),
 		result: Res::None,
 		subtraces: 0,
diff --git a/rpc/src/v1/types/trace.rs b/rpc/src/v1/types/trace.rs
index e858d7b17..b59a07b6e 100644
--- a/rpc/src/v1/types/trace.rs
+++ b/rpc/src/v1/types/trace.rs
@@ -24,7 +24,6 @@ use serde::ser::SerializeStruct;
 use serde::{Serialize, Serializer};
 use types::account_diff;
 use types::state_diff;
-use vm;
 
 use v1::types::Bytes;
 
@@ -214,6 +213,7 @@ impl From<state_diff::StateDiff> for StateDiff {
 
 /// Create response
 #[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
 pub struct Create {
 	/// Sender
 	from: H160,
@@ -223,6 +223,9 @@ pub struct Create {
 	gas: U256,
 	/// Initialization code
 	init: Bytes,
+	// Create Type
+	#[serde(skip_serializing_if="Option::is_none")]
+	creation_method: Option<CreationMethod>,
 }
 
 impl From<trace::Create> for Create {
@@ -232,6 +235,7 @@ impl From<trace::Create> for Create {
 			value: c.value,
 			gas: c.gas,
 			init: Bytes::new(c.init),
+			creation_method: c.creation_method.map(|c| c.into()),
 		}
 	}
 }
@@ -240,8 +244,6 @@ impl From<trace::Create> for Create {
 #[derive(Debug, Serialize)]
 #[serde(rename_all = "lowercase")]
 pub enum CallType {
-	/// None
-	None,
 	/// Call
 	Call,
 	/// Call code
@@ -252,14 +254,32 @@ pub enum CallType {
 	StaticCall,
 }
 
-impl From<vm::CallType> for CallType {
-	fn from(c: vm::CallType) -> Self {
+impl From<trace::CallType> for CallType {
+	fn from(c: trace::CallType) -> Self {
 		match c {
-			vm::CallType::None => CallType::None,
-			vm::CallType::Call => CallType::Call,
-			vm::CallType::CallCode => CallType::CallCode,
-			vm::CallType::DelegateCall => CallType::DelegateCall,
-			vm::CallType::StaticCall => CallType::StaticCall,
+			trace::CallType::Call => CallType::Call,
+			trace::CallType::CallCode => CallType::CallCode,
+			trace::CallType::DelegateCall => CallType::DelegateCall,
+			trace::CallType::StaticCall => CallType::StaticCall,
+		}
+	}
+}
+
+/// Create type.
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum CreationMethod {
+	/// Create
+	Create,
+	/// Create2
+	Create2,
+}
+
+impl From<trace::CreationMethod> for CreationMethod {
+	fn from(c: trace::CreationMethod) -> Self {
+		match c {
+			trace::CreationMethod::Create => CreationMethod::Create,
+			trace::CreationMethod::Create2 => CreationMethod::Create2,
 		}
 	}
 }
@@ -279,18 +299,19 @@ pub struct Call {
 	/// Input data
 	input: Bytes,
 	/// The type of the call.
-	call_type: CallType,
+	call_type: Option<CallType>,
 }
 
 impl From<trace::Call> for Call {
 	fn from(c: trace::Call) -> Self {
+		let optional: Option<trace::CallType> = c.call_type.0;
 		Call {
 			from: c.from,
 			to: c.to,
 			value: c.value,
 			gas: c.gas,
 			input: c.input.into(),
-			call_type: c.call_type.into(),
+			call_type: optional.map(|c| c.into()),
 		}
 	}
 }
@@ -681,7 +702,7 @@ mod tests {
 				value: 6.into(),
 				gas: 7.into(),
 				input: Bytes::new(vec![0x12, 0x34]),
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call),
 			}),
 			result: Res::Call(CallResult {
 				gas_used: 8.into(),
@@ -707,7 +728,7 @@ mod tests {
 				value: 6.into(),
 				gas: 7.into(),
 				input: Bytes::new(vec![0x12, 0x34]),
-				call_type: CallType::Call,
+				call_type: Some(CallType::Call),
 			}),
 			result: Res::FailedCall(TraceError::OutOfGas),
 			trace_address: vec![10],
@@ -729,6 +750,7 @@ mod tests {
 				value: 6.into(),
 				gas: 7.into(),
 				init: Bytes::new(vec![0x12, 0x34]),
+				creation_method: Some(CreationMethod::Create).into(),
 			}),
 			result: Res::Create(CreateResult {
 				gas_used: 8.into(),
@@ -743,7 +765,7 @@ mod tests {
 			block_hash: H256::from_low_u64_be(14),
 		};
 		let serialized = serde_json::to_string(&t).unwrap();
-		assert_eq!(serialized, r#"{"type":"create","action":{"from":"0x0000000000000000000000000000000000000004","value":"0x6","gas":"0x7","init":"0x1234"},"result":{"gasUsed":"0x8","code":"0x5678","address":"0x00000000000000000000000000000000000000ff"},"traceAddress":[10],"subtraces":1,"transactionPosition":11,"transactionHash":"0x000000000000000000000000000000000000000000000000000000000000000c","blockNumber":13,"blockHash":"0x000000000000000000000000000000000000000000000000000000000000000e"}"#);
+		assert_eq!(serialized, r#"{"type":"create","action":{"from":"0x0000000000000000000000000000000000000004","value":"0x6","gas":"0x7","init":"0x1234","creationMethod":"create"},"result":{"gasUsed":"0x8","code":"0x5678","address":"0x00000000000000000000000000000000000000ff"},"traceAddress":[10],"subtraces":1,"transactionPosition":11,"transactionHash":"0x000000000000000000000000000000000000000000000000000000000000000c","blockNumber":13,"blockHash":"0x000000000000000000000000000000000000000000000000000000000000000e"}"#);
 	}
 
 	#[test]
@@ -754,6 +776,7 @@ mod tests {
 				value: 6.into(),
 				gas: 7.into(),
 				init: Bytes::new(vec![0x12, 0x34]),
+				creation_method: Some(CreationMethod::Create).into(),
 			}),
 			result: Res::FailedCreate(TraceError::OutOfGas),
 			trace_address: vec![10],
@@ -764,7 +787,7 @@ mod tests {
 			block_hash: H256::from_low_u64_be(14),
 		};
 		let serialized = serde_json::to_string(&t).unwrap();
-		assert_eq!(serialized, r#"{"type":"create","action":{"from":"0x0000000000000000000000000000000000000004","value":"0x6","gas":"0x7","init":"0x1234"},"error":"Out of gas","traceAddress":[10],"subtraces":1,"transactionPosition":11,"transactionHash":"0x000000000000000000000000000000000000000000000000000000000000000c","blockNumber":13,"blockHash":"0x000000000000000000000000000000000000000000000000000000000000000e"}"#);
+		assert_eq!(serialized, r#"{"type":"create","action":{"from":"0x0000000000000000000000000000000000000004","value":"0x6","gas":"0x7","init":"0x1234","creationMethod":"create"},"error":"Out of gas","traceAddress":[10],"subtraces":1,"transactionPosition":11,"transactionHash":"0x000000000000000000000000000000000000000000000000000000000000000c","blockNumber":13,"blockHash":"0x000000000000000000000000000000000000000000000000000000000000000e"}"#);
 	}
 
 	#[test]
diff --git a/scripts/gitlab/test-linux.sh b/scripts/gitlab/test-linux.sh
index 33e8f311a..808c74183 100755
--- a/scripts/gitlab/test-linux.sh
+++ b/scripts/gitlab/test-linux.sh
@@ -5,8 +5,8 @@ echo "________Running test-linux.sh________"
 set -e # fail on any error
 set -u # treat unset variables as error
 
-export CC="sccache gcc"
-export CXX="sccache g++"
+export CC="sccache "$CC
+export CXX="sccache "$CXX
 FEATURES="json-tests"
 
 OPTIONS="--release"
diff --git a/secret-store/Cargo.toml b/secret-store/Cargo.toml
index 609e5ff62..2c19907a5 100644
--- a/secret-store/Cargo.toml
+++ b/secret-store/Cargo.toml
@@ -15,8 +15,8 @@ ethkey = { path = "../accounts/ethkey", optional = true }
 futures = "0.1"
 hyper = { version = "0.12", default-features = false }
 keccak-hash = "0.4.0"
-kvdb = "0.2"
-kvdb-rocksdb = "0.3.0"
+kvdb = "0.3.1"
+kvdb-rocksdb = "0.4.1"
 lazy_static = "1.0"
 log = "0.4"
 parity-bytes = "0.1"
@@ -38,4 +38,4 @@ jsonrpc-server-utils = "14.0.3"
 [dev-dependencies]
 env_logger = "0.5"
 tempdir = "0.3"
-kvdb-rocksdb = "0.3.0"
+kvdb-rocksdb = "0.4.1"
diff --git a/util/EIP-152/Cargo.toml b/util/EIP-152/Cargo.toml
index fb474919f..1f7131fe4 100644
--- a/util/EIP-152/Cargo.toml
+++ b/util/EIP-152/Cargo.toml
@@ -11,11 +11,11 @@ license = "GPL-3.0"
 edition = "2018"
 
 [dependencies]
-rustc-hex = "2.0.1"
 arrayref = "0.3.5"
 
 [dev-dependencies]
 criterion = "0.3"
+rustc-hex = "2.0.1"
 
 [[bench]]
 name = "bench"
diff --git a/util/journaldb/Cargo.toml b/util/journaldb/Cargo.toml
index 59d2d1397..a6b74952b 100644
--- a/util/journaldb/Cargo.toml
+++ b/util/journaldb/Cargo.toml
@@ -12,7 +12,7 @@ ethereum-types = "0.8.0"
 hash-db = "0.15.0"
 malloc_size_of = { version = "0.3.0", package = "parity-util-mem" }
 keccak-hasher = { path = "../keccak-hasher" }
-kvdb = "0.2"
+kvdb = "0.3.1"
 log = "0.4"
 memory-db = "0.18.0"
 parking_lot = "0.9"
@@ -22,4 +22,4 @@ rlp = "0.4.0"
 [dev-dependencies]
 env_logger = "0.5"
 keccak-hash = "0.4.0"
-kvdb-memorydb = "0.2.0"
+kvdb-memorydb = "0.3.1"
diff --git a/util/journaldb/src/overlayrecentdb.rs b/util/journaldb/src/overlayrecentdb.rs
index ed4c5bb25..8f1763770 100644
--- a/util/journaldb/src/overlayrecentdb.rs
+++ b/util/journaldb/src/overlayrecentdb.rs
@@ -20,6 +20,7 @@ use std::{
 	collections::{HashMap, hash_map::Entry},
 	io,
 	sync::Arc,
+	time::Duration,
 };
 
 use ethereum_types::H256;
@@ -279,11 +280,22 @@ impl JournalDB for OverlayRecentDB {
 	fn earliest_era(&self) -> Option<u64> { self.journal_overlay.read().earliest_era }
 
 	fn state(&self, key: &H256) -> Option<Bytes> {
-		let journal_overlay = self.journal_overlay.read();
 		let key = to_short_key(key);
-		journal_overlay.backing_overlay.get(&key, EMPTY_PREFIX)
-			.or_else(|| journal_overlay.pending_overlay.get(&key).map(|d| d.clone()))
-			.or_else(|| self.backing.get_by_prefix(self.column, &key[0..DB_PREFIX_LEN]).map(|b| b.to_vec()))
+		// Hold the read lock for shortest possible amount of time.
+		let maybe_state_data = {
+			let journal_overlay = self.journal_overlay.read();
+			journal_overlay
+				.backing_overlay
+				.get(&key, EMPTY_PREFIX)
+				.or_else(|| journal_overlay.pending_overlay.get(&key).map(|d| d.clone()))
+		};
+
+		maybe_state_data.or_else(|| {
+			let pkey = &key[..DB_PREFIX_LEN];
+			self.backing
+				.get_by_prefix(self.column, &pkey)
+				.map(|b| b.to_vec())
+		})
 	}
 
 	fn journal_under(&mut self, batch: &mut DBTransaction, now: u64, id: &H256) -> io::Result<u32> {
diff --git a/util/migration-rocksdb/Cargo.toml b/util/migration-rocksdb/Cargo.toml
index a6d3c3c62..3854f4244 100644
--- a/util/migration-rocksdb/Cargo.toml
+++ b/util/migration-rocksdb/Cargo.toml
@@ -6,8 +6,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 log = "0.4"
 macros = { path = "../macros" }
-kvdb = "0.2"
-kvdb-rocksdb = "0.3.0"
+kvdb = "0.3.1"
+kvdb-rocksdb = "0.4.1"
 
 [dev-dependencies]
 tempdir = "0.3"
diff --git a/util/network-devp2p/src/connection.rs b/util/network-devp2p/src/connection.rs
index 0ddeb3737..2f88efb2d 100644
--- a/util/network-devp2p/src/connection.rs
+++ b/util/network-devp2p/src/connection.rs
@@ -40,11 +40,11 @@ use crate::handshake::Handshake;
 
 const ENCRYPTED_HEADER_LEN: usize = 32;
 const RECEIVE_PAYLOAD: Duration = Duration::from_secs(30);
-pub const MAX_PAYLOAD_SIZE: usize = (1 << 24) - 1;
+pub const MAX_PAYLOAD_SIZE: usize = (1 << 24) - 1; // 16Mb
 
 /// Network responses should try not to go over this limit.
 /// This should be lower than MAX_PAYLOAD_SIZE
-pub const PAYLOAD_SOFT_LIMIT: usize = (1 << 22) - 1;
+pub const PAYLOAD_SOFT_LIMIT: usize = (1 << 22) - 1; // 4Mb
 
 pub trait GenericSocket : Read + Write {
 }
@@ -97,7 +97,7 @@ impl<Socket: GenericSocket> GenericConnection<Socket> {
 					else if self.rec_buf.len() > self.rec_size {
 						warn!(target:"network", "Read past buffer {} bytes", self.rec_buf.len() - self.rec_size);
 						return Ok(Some(::std::mem::replace(&mut self.rec_buf, Bytes::new())))
-                    }
+					}
 				},
 				Ok(_) => return Ok(None),
 				Err(e) => {
@@ -105,7 +105,7 @@ impl<Socket: GenericSocket> GenericConnection<Socket> {
 					return Err(e)
 				}
 			}
-        }
+		}
 	}
 
 	/// Add a packet to send queue.
@@ -222,7 +222,7 @@ impl Connection {
 	pub fn register_socket<Host: Handler>(&self, reg: Token, event_loop: &mut EventLoop<Host>) -> io::Result<()> {
 		if self.registered.compare_and_swap(false, true, AtomicOrdering::SeqCst) {
 			return Ok(());
-        }
+		}
 		trace!(target: "network", "connection register; token={:?}", reg);
 		if let Err(e) = event_loop.register(&self.socket, reg, self.interest, PollOpt::edge() /* | PollOpt::oneshot() */) { // TODO: oneshot is broken on windows
 			trace!(target: "network", "Failed to register {:?}, {:?}", reg, e);
@@ -235,7 +235,7 @@ impl Connection {
 		trace!(target: "network", "connection reregister; token={:?}", reg);
 		if !self.registered.load(AtomicOrdering::SeqCst) {
 			self.register_socket(reg, event_loop)
-        } else {
+		} else {
 			event_loop.reregister(&self.socket, reg, self.interest, PollOpt::edge() /* | PollOpt::oneshot() */ ).unwrap_or_else(|e| {  // TODO: oneshot is broken on windows
 				trace!(target: "network", "Failed to reregister {:?}, {:?}", reg, e);
 			});
diff --git a/util/rlp-derive/Cargo.toml b/util/rlp-derive/Cargo.toml
index ba5fb984f..878b80167 100644
--- a/util/rlp-derive/Cargo.toml
+++ b/util/rlp-derive/Cargo.toml
@@ -1,16 +1,17 @@
 [package]
 name = "rlp_derive"
 version = "0.1.0"
-authors = ["debris <marek.kotewicz@gmail.com>"]
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
 
 [lib]
 name = "rlp_derive"
 proc-macro = true
 
 [dependencies]
-syn = "0.15"
-quote = "0.6"
-proc-macro2 = "0.4"
+syn = "1.0.14"
+quote = "1.0.2"
+proc-macro2 = "1.0.8"
 
 [dev-dependencies]
 rlp = "0.4.0"
diff --git a/util/rlp-derive/src/de.rs b/util/rlp-derive/src/de.rs
index b59d310e3..3ae4b3aff 100644
--- a/util/rlp-derive/src/de.rs
+++ b/util/rlp-derive/src/de.rs
@@ -14,8 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-use syn;
-use proc_macro2::{TokenStream, Span};
+use proc_macro2::TokenStream;
+use quote::quote;
 
 struct ParseQuotes {
 	single: TokenStream,
@@ -45,10 +45,19 @@ pub fn impl_decodable(ast: &syn::DeriveInput) -> TokenStream {
 		_ => panic!("#[derive(RlpDecodable)] is only defined for structs."),
 	};
 
-	let stmts: Vec<_> = body.fields.iter().enumerate().map(decodable_field_map).collect();
+	let mut default_attribute_encountered = false;
+	let stmts: Vec<_> = body
+		.fields
+		.iter()
+		.enumerate()
+		.map(|(i, field)| decodable_field(
+			i,
+			field,
+			decodable_parse_quotes(),
+			&mut default_attribute_encountered,
+		)).collect();
 	let name = &ast.ident;
 
-	let dummy_const = syn::Ident::new(&format!("_IMPL_RLP_DECODABLE_FOR_{}", name), Span::call_site());
 	let impl_block = quote! {
 		impl rlp::Decodable for #name {
 			fn decode(rlp: &rlp::Rlp) -> Result<Self, rlp::DecoderError> {
@@ -62,8 +71,7 @@ pub fn impl_decodable(ast: &syn::DeriveInput) -> TokenStream {
 	};
 
 	quote! {
-		#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
-		const #dummy_const: () = {
+		const _: () = {
 			extern crate rlp;
 			#impl_block
 		};
@@ -80,7 +88,13 @@ pub fn impl_decodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
 		let fields: Vec<_> = body.fields.iter().collect();
 		if fields.len() == 1 {
 			let field = fields.first().expect("fields.len() == 1; qed");
-			decodable_field(0, field, decodable_wrapper_parse_quotes())
+			let mut default_attribute_encountered = false;
+			decodable_field(
+				0,
+				field,
+				decodable_wrapper_parse_quotes(),
+				&mut default_attribute_encountered,
+			)
 		} else {
 			panic!("#[derive(RlpEncodableWrapper)] is only defined for structs with one field.")
 		}
@@ -88,7 +102,6 @@ pub fn impl_decodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
 
 	let name = &ast.ident;
 
-	let dummy_const = syn::Ident::new(&format!("_IMPL_RLP_DECODABLE_FOR_{}", name), Span::call_site());
 	let impl_block = quote! {
 		impl rlp::Decodable for #name {
 			fn decode(rlp: &rlp::Rlp) -> Result<Self, rlp::DecoderError> {
@@ -102,19 +115,19 @@ pub fn impl_decodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
 	};
 
 	quote! {
-		#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
-		const #dummy_const: () = {
+		const _: () = {
 			extern crate rlp;
 			#impl_block
 		};
 	}
 }
 
-fn decodable_field_map(tuple: (usize, &syn::Field)) -> TokenStream {
-	decodable_field(tuple.0, tuple.1, decodable_parse_quotes())
-}
-
-fn decodable_field(index: usize, field: &syn::Field, quotes: ParseQuotes) -> TokenStream {
+fn decodable_field(
+	index: usize,
+	field: &syn::Field,
+	quotes: ParseQuotes,
+	default_attribute_encountered: &mut bool,
+) -> TokenStream {
 	let id = match field.ident {
 		Some(ref ident) => quote! { #ident },
 		None => {
@@ -123,28 +136,58 @@ fn decodable_field(index: usize, field: &syn::Field, quotes: ParseQuotes) -> Tok
 		}
 	};
 
+	let index = index - *default_attribute_encountered as usize;
 	let index = quote! { #index };
 
 	let single = quotes.single;
 	let list = quotes.list;
 
+	let attributes = &field.attrs;
+	let default = if let Some(attr) = attributes.iter().find(|attr| attr.path.is_ident("rlp")) {
+		if *default_attribute_encountered {
+			panic!("only 1 #[rlp(default)] attribute is allowed in a struct")
+		}
+		match attr.parse_args() {
+			Ok(proc_macro2::TokenTree::Ident(ident)) if ident.to_string() == "default" => {},
+			_ => panic!("only #[rlp(default)] attribute is supported"),
+		}
+		*default_attribute_encountered = true;
+		true
+	} else {
+		false
+	};
+
 	match field.ty {
 		syn::Type::Path(ref path) => {
-			let ident = &path.path.segments.first().expect("there must be at least 1 segment").value().ident;
-			if &ident.to_string() == "Vec" {
+			let ident = &path
+				.path
+				.segments
+				.first()
+				.expect("there must be at least 1 segment")
+				.ident;
+			let ident_type = ident.to_string();
+			if &ident_type == "Vec" {
 				if quotes.takes_index {
-					quote! { #id: #list(#index)?, }
+					if default {
+						quote! { #id: #list(#index).unwrap_or_default(), }
+					} else {
+						quote! { #id: #list(#index)?, }
+					}
 				} else {
 					quote! { #id: #list()?, }
 				}
 			} else {
 				if quotes.takes_index {
-					quote! { #id: #single(#index)?, }
+					if default {
+						quote! { #id: #single(#index).unwrap_or_default(), }
+					} else {
+						quote! { #id: #single(#index)?, }
+					}
 				} else {
 					quote! { #id: #single()?, }
 				}
 			}
-		},
+		}
 		_ => panic!("rlp_derive not supported"),
 	}
 }
diff --git a/util/rlp-derive/src/en.rs b/util/rlp-derive/src/en.rs
index 828ad6b0f..32905456a 100644
--- a/util/rlp-derive/src/en.rs
+++ b/util/rlp-derive/src/en.rs
@@ -14,8 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-use syn;
-use proc_macro2::{TokenStream, Span};
+use proc_macro2::TokenStream;
+use quote::quote;
 
 pub fn impl_encodable(ast: &syn::DeriveInput) -> TokenStream {
 	let body = match ast.data {
@@ -23,12 +23,16 @@ pub fn impl_encodable(ast: &syn::DeriveInput) -> TokenStream {
 		_ => panic!("#[derive(RlpEncodable)] is only defined for structs."),
 	};
 
-	let stmts: Vec<_> = body.fields.iter().enumerate().map(encodable_field_map).collect();
+	let stmts: Vec<_> = body
+		.fields
+		.iter()
+		.enumerate()
+		.map(|(i, field)| encodable_field(i, field))
+		.collect();
 	let name = &ast.ident;
 
 	let stmts_len = stmts.len();
 	let stmts_len = quote! { #stmts_len };
-	let dummy_const = syn::Ident::new(&format!("_IMPL_RLP_ENCODABLE_FOR_{}", name), Span::call_site());
 	let impl_block = quote! {
 		impl rlp::Encodable for #name {
 			fn rlp_append(&self, stream: &mut rlp::RlpStream) {
@@ -39,8 +43,7 @@ pub fn impl_encodable(ast: &syn::DeriveInput) -> TokenStream {
 	};
 
 	quote! {
-		#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
-		const #dummy_const: () = {
+		const _: () = {
 			extern crate rlp;
 			#impl_block
 		};
@@ -65,7 +68,6 @@ pub fn impl_encodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
 
 	let name = &ast.ident;
 
-	let dummy_const = syn::Ident::new(&format!("_IMPL_RLP_ENCODABLE_FOR_{}", name), Span::call_site());
 	let impl_block = quote! {
 		impl rlp::Encodable for #name {
 			fn rlp_append(&self, stream: &mut rlp::RlpStream) {
@@ -75,18 +77,13 @@ pub fn impl_encodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
 	};
 
 	quote! {
-		#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
-		const #dummy_const: () = {
+		const _: () = {
 			extern crate rlp;
 			#impl_block
 		};
 	}
 }
 
-fn encodable_field_map(tuple: (usize, &syn::Field)) -> TokenStream {
-	encodable_field(tuple.0, tuple.1)
-}
-
 fn encodable_field(index: usize, field: &syn::Field) -> TokenStream {
 	let ident = match field.ident {
 		Some(ref ident) => quote! { #ident },
@@ -100,24 +97,38 @@ fn encodable_field(index: usize, field: &syn::Field) -> TokenStream {
 
 	match field.ty {
 		syn::Type::Path(ref path) => {
-			let top_segment = path.path.segments.first().expect("there must be at least 1 segment");
-			let ident = &top_segment.value().ident;
+			let top_segment = path
+				.path
+				.segments
+				.first()
+				.expect("there must be at least 1 segment");
+			let ident = &top_segment.ident;
 			if &ident.to_string() == "Vec" {
-				let inner_ident = match top_segment.value().arguments {
+				let inner_ident = match top_segment.arguments {
 					syn::PathArguments::AngleBracketed(ref angle) => {
-						let ty = angle.args.first().expect("Vec has only one angle bracketed type; qed");
-						match **ty.value() {
-							syn::GenericArgument::Type(syn::Type::Path(ref path)) => &path.path.segments.first().expect("there must be at least 1 segment").value().ident,
+						let ty = angle
+							.args
+							.first()
+							.expect("Vec has only one angle bracketed type; qed");
+						match *ty {
+							syn::GenericArgument::Type(syn::Type::Path(ref path)) => {
+								&path
+									.path
+									.segments
+									.first()
+									.expect("there must be at least 1 segment")
+									.ident
+							}
 							_ => panic!("rlp_derive not supported"),
 						}
-					},
+					}
 					_ => unreachable!("Vec has only one angle bracketed type; qed"),
 				};
 				quote! { stream.append_list::<#inner_ident, _>(&#id); }
 			} else {
 				quote! { stream.append(&#id); }
 			}
-		},
+		}
 		_ => panic!("rlp_derive not supported"),
 	}
 }
diff --git a/util/rlp-derive/src/lib.rs b/util/rlp-derive/src/lib.rs
index 15757ffd6..3c9799e2a 100644
--- a/util/rlp-derive/src/lib.rs
+++ b/util/rlp-derive/src/lib.rs
@@ -15,19 +15,15 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
 extern crate proc_macro;
-extern crate proc_macro2;
-extern crate syn;
-#[macro_use]
-extern crate quote;
 
-mod en;
 mod de;
+mod en;
 
-use proc_macro::TokenStream;
-use en::{impl_encodable, impl_encodable_wrapper};
 use de::{impl_decodable, impl_decodable_wrapper};
+use en::{impl_encodable, impl_encodable_wrapper};
+use proc_macro::TokenStream;
 
-#[proc_macro_derive(RlpEncodable)]
+#[proc_macro_derive(RlpEncodable, attributes(rlp))]
 pub fn encodable(input: TokenStream) -> TokenStream {
 	let ast = syn::parse(input).unwrap();
 	let gen = impl_encodable(&ast);
@@ -41,7 +37,7 @@ pub fn encodable_wrapper(input: TokenStream) -> TokenStream {
 	gen.into()
 }
 
-#[proc_macro_derive(RlpDecodable)]
+#[proc_macro_derive(RlpDecodable, attributes(rlp))]
 pub fn decodable(input: TokenStream) -> TokenStream {
 	let ast = syn::parse(input).unwrap();
 	let gen = impl_decodable(&ast);
diff --git a/util/rlp-derive/tests/rlp.rs b/util/rlp-derive/tests/rlp.rs
index 0e78c169e..adf737667 100644
--- a/util/rlp-derive/tests/rlp.rs
+++ b/util/rlp-derive/tests/rlp.rs
@@ -14,11 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-extern crate rlp;
-#[macro_use]
-extern crate rlp_derive;
-
-use rlp::{encode, decode};
+use rlp::{decode, encode};
+use rlp_derive::{RlpDecodable, RlpDecodableWrapper, RlpEncodable, RlpEncodableWrapper};
 
 #[derive(Debug, PartialEq, RlpEncodable, RlpDecodable)]
 struct Foo {
@@ -32,9 +29,7 @@ struct FooWrapper {
 
 #[test]
 fn test_encode_foo() {
-	let foo = Foo {
-		a: "cat".into(),
-	};
+	let foo = Foo { a: "cat".into() };
 
 	let expected = vec![0xc4, 0x83, b'c', b'a', b't'];
 	let out = encode(&foo);
@@ -46,9 +41,7 @@ fn test_encode_foo() {
 
 #[test]
 fn test_encode_foo_wrapper() {
-	let foo = FooWrapper {
-		a: "cat".into(),
-	};
+	let foo = FooWrapper { a: "cat".into() };
 
 	let expected = vec![0x83, b'c', b'a', b't'];
 	let out = encode(&foo);
@@ -57,3 +50,30 @@ fn test_encode_foo_wrapper() {
 	let decoded = decode(&expected).expect("decode failure");
 	assert_eq!(foo, decoded);
 }
+
+#[test]
+fn test_encode_foo_default() {
+	#[derive(Debug, PartialEq, RlpEncodable, RlpDecodable)]
+	struct FooDefault {
+		a: String,
+		/// It works with other attributes.
+		#[rlp(default)]
+		b: Option<Vec<u8>>,
+	}
+
+	let attack_of = String::from("clones");
+	let foo = Foo { a: attack_of.clone() };
+
+	let expected = vec![0xc7, 0x86, b'c', b'l', b'o', b'n', b'e', b's'];
+	let out = encode(&foo);
+	assert_eq!(out, expected);
+
+	let foo_default = FooDefault { a: attack_of.clone(), b: None };
+
+	let decoded = decode(&expected).expect("default failure");
+	assert_eq!(foo_default, decoded);
+
+	let foo_some = FooDefault { a: attack_of.clone(), b: Some(vec![1, 2, 3]) };
+	let out = encode(&foo_some);
+	assert_eq!(decode(&out), Ok(foo_some));
+}
diff --git a/util/version/Cargo.toml b/util/version/Cargo.toml
index cada7ed68..aae4bddbb 100644
--- a/util/version/Cargo.toml
+++ b/util/version/Cargo.toml
@@ -3,7 +3,7 @@
 [package]
 name = "parity-version"
 # NOTE: this value is used for Parity Ethereum version string (via env CARGO_PKG_VERSION)
-version = "2.7.1"
+version = "2.7.2"
 authors = ["Parity Technologies <admin@parity.io>"]
 build = "build.rs"