Beta 2.5.3 (#10776 )

* ethcore/res: activate atlantis classic hf on block 8772000 (#10766) * fix docker tags for publishing (#10741) * fix: aura don't add `SystemTime::now()` (#10720) This commit does the following: - Prevent overflow in `verify_timestamp()` by not adding `now` to found faulty timestamp - Use explicit `CheckedSystemTime::checked_add` to prevent potential consensus issues because SystemTime is platform depedent - remove `#[cfg(not(time_checked_add))]` conditional compilation * Update version * Treat empty account the same as non-exist accounts in EIP-1052 (#10775) * DevP2p: Get node IP address and udp port from Socket, if not included in PING packet (#10705) * get node IP address and udp port from Socket, if not included in PING packet * prevent bootnodes from being added to host nodes * code corrections * code corrections * code corrections * code corrections * docs * code corrections * code corrections * Apply suggestions from code review Co-Authored-By: David <dvdplm@gmail.com> * Add a way to signal shutdown to snapshotting threads (#10744) * Add a way to signal shutdown to snapshotting threads * Pass Progress to fat_rlps() so we can abort from there too. * Checking for abort in a single spot * Remove nightly-only weak/strong counts * fix warning * Fix tests * Add dummy impl to abort snapshots * Add another dummy impl for TestSnapshotService * Remove debugging code * Return error instead of the odd Ok(()) Switch to AtomicU64 * revert .as_bytes() change * fix build * fix build maybe
backports for beta 2.5.2 (#10737 )
2019-06-25 13:38:29 +00:00 · 2019-06-11 20:56:03 +02:00 · 2019-05-14 15:03:29 +02:00 · 2019-05-14 14:04:54 +02:00 · 2019-05-10 13:48:52 +02:00 · 2019-04-08 11:44:10 +02:00
483 changed files with 10483 additions and 11452 deletions
--- a/.cargo/config
+++ b/.cargo/config
@@ -1,27 +1,3 @@
-# NOTE: if you make changes here, remember to also update:
-#	scripts/test-linux.sh
-#	scripts/build-linux.sh
-#	scripts/build-windows.sh
-
-# Using 'cfg` is broken, see https://github.com/rust-lang/cargo/issues/6858
-#[target.'cfg(target_arch = "x86_64")']
-#rustflags = ["-Ctarget-feature=+aes,+sse2,+ssse3"]
-
-# …so instead we list all target triples (Tier 1 64-bit platforms)
-[target.x86_64-unknown-linux-gnu]
-# Enables the aes-ni instructions for RustCrypto dependency.
-rustflags = ["-Ctarget-feature=+aes,+sse2,+ssse3"]
-
-[target.x86_64-pc-windows-gnu]
-# Enables the aes-ni instructions for RustCrypto dependency.
-rustflags = ["-Ctarget-feature=+aes,+sse2,+ssse3"]
-
 [target.x86_64-pc-windows-msvc]
-# Enables the aes-ni instructions for RustCrypto dependency.
 # Link the C runtime statically ; https://github.com/paritytech/parity-ethereum/issues/6643
-rustflags = ["-Ctarget-feature=+aes,+sse2,+ssse3", "-Ctarget-feature=+crt-static"]
-
-[target.x86_64-apple-darwin]
-# Enables the aes-ni instructions for RustCrypto dependency.
-rustflags = ["-Ctarget-feature=+aes,+sse2,+ssse3"]
-
+rustflags = ["-Ctarget-feature=+crt-static"]
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -24,42 +24,7 @@ Also, try to include **steps to reproduce** the issue and expand on the **actual

 If you would like to contribute to Parity Ethereum, please **fork it**, fix bugs or implement features, and [propose a pull request](https://github.com/paritytech/parity-ethereum/compare).

-### Labels & Milestones
-
-We use [labels](https://github.com/paritytech/parity-ethereum/labels) to manage PRs and issues and communicate the state of a PR. Please familiarize yourself with them. Furthermore we are organizing issues in [milestones](https://github.com/paritytech/parity-ethereum/milestones). Best way to get started is to a pick a ticket from the current milestone tagged [`easy`](https://github.com/paritytech/parity-ethereum/labels/Q2-easy%20%F0%9F%92%83) and get going, or [`mentor`](https://github.com/paritytech/parity-ethereum/labels/Q1-mentor%20%F0%9F%95%BA) and get in contact with the mentor offering their support on that larger task.
-
-### Rules
-
-There are a few basic ground-rules for contributors (including the maintainer(s) of the project):
-
-* **No pushing directly to the master branch**.
-* **All modifications** must be made in a **pull-request** to solicit feedback from other contributors.
-* Pull-requests cannot be merged before CI runs green and two reviewers have given their approval.
-* Contributors should adhere to the [Parity Ethereum Style Guide](https://wiki.parity.io/Parity-Ethereum-Style-Guide).
-
-### Recommendations
-
-* **Non-master branch names** *should* be prefixed with a short name moniker, followed by the associated Github Issue ID (if any), and a brief description of the task using the format `<GITHUB_USERNAME>-<ISSUE_ID>-<BRIEF_DESCRIPTION>` (e.g. `gavin-123-readme`). The name moniker helps people to inquiry about their unfinished work, and the GitHub Issue ID helps your future self and other developers (particularly those who are onboarding) find out about and understand the original scope of the task, and where it fits into Parity Ethereum [Projects](https://github.com/paritytech/parity-ethereum/projects).
-* **Remove stale branches periodically**
-
-### Preparing Pull Requests
-
-* If your PR does not alter any logic (e.g. comments, dependencies, docs), then it may be tagged [`insubstantial`](https://github.com/paritytech/parity-ethereum/pulls?q=is%3Aopen+is%3Apr+label%3A%22A2-insubstantial+%F0%9F%91%B6%22).
-
-* Once a PR is ready for review please add the [`pleasereview`](https://github.com/paritytech/parity-ethereum/pulls?utf8=%E2%9C%93&q=is%3Aopen+is%3Apr+label%3A%22A0-pleasereview+%F0%9F%A4%93%22+) label.
-
-### Reviewing Pull Requests*:
-
-* At least two reviewers are required to review PRs (even for PRs tagged [`insubstantial`](https://github.com/paritytech/parity-ethereum/pulls?q=is%3Aopen+is%3Apr+label%3A%22A2-insubstantial+%F0%9F%91%B6%22)).
-
-When doing a review, make sure to look for any:
-
-* Buggy behavior.
-* Undue maintenance burden.
-* Breaking with house coding style.
-* Pessimization (i.e. reduction of speed as measured in the projects benchmarks).
-* Breaking changes should be carefuly reviewed and tagged as such so they end up in the [changelog](../CHANGELOG.md).
-* Uselessness (i.e. it does not strictly add a feature or fix a known issue).
+Please, refer to the [Coding Guide](https://wiki.parity.io/Coding-guide) in our wiki for more details about hacking on Parity.

 ## License.

--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -1,14 +1,10 @@
 _Before filing a new issue, please **provide the following information**._

-_If you think that your issue is an exploitable security vulnerability, please mail your bugreport to security@parity.io instead; your submission might be eligible for our Bug Bounty._
-_You can find mode info on the reporting process in [SECURITY.md](https://github.com/paritytech/parity-ethereum/blob/master/SECURITY.md)_
-
-
 - **Parity Ethereum version**: 0.0.0
 - **Operating system**: Windows / MacOS / Linux
 - **Installation**: homebrew / one-line installer / built from source
 - **Fully synchronized**: no / yes
- **Network**: ethereum / ropsten / goerli / ...
+- **Network**: ethereum / ropsten / kovan / ...
 - **Restarted**: no / yes

 _Your issue description goes here below. Try to include **actual** vs. **expected behavior** and **steps to reproduce** the issue._
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,21 +0,0 @@
-Thank you for your Pull Request!
-
-Before you submitting, please check that:
-
- [ ] You added a brief description of the PR, e.g.:
-  - What does it do?
-  - What important points reviewers should know?
-  - Is there something left for follow-up PRs?
- [ ] You labeled the PR with appropriate labels if you have permissions to do so.
- [ ] You mentioned a related issue if this PR related to it, e.g. `Fixes #228` or `Related #1337`.
- [ ] You asked any particular reviewers to review. If you aren't sure, start with GH suggestions.
- [ ] Your PR adheres [the style guide](https://wiki.parity.io/Coding-guide)
-  - In particular, mind the maximal line length.
-  - There is no commented code checked in unless necessary.
-  - Any panickers have a proof or removed.
- [ ] You updated any rustdocs which may have changed
-
-After you've read this notice feel free to remove it.
-Thank you!
-
-✄ -----------------------------------------------------------------------------
--- a/Cargo.lock
+++ b/Cargo.lock
--- 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 = "2.6.0"
+version = "2.5.3"
 license = "GPL-3.0"
 authors = ["Parity Technologies <admin@parity.io>"]

@@ -18,7 +18,7 @@ num_cpus = "1.2"
 number_prefix = "0.2"
 rpassword = "1.0"
 semver = "0.9"
-ansi_term = "0.11"
+ansi_term = "0.10"
 parking_lot = "0.7"
 regex = "1.0"
 atty = "0.2.8"
@@ -29,7 +29,7 @@ serde_derive = "1.0"
 futures = "0.1"
 fdlimit = "0.1"
 ctrlc = { git = "https://github.com/paritytech/rust-ctrlc.git" }
-jsonrpc-core = "12.0.0"
+jsonrpc-core = "10.0.1"
 parity-bytes = "0.1"
 common-types = { path = "ethcore/types" }
 ethcore = { path = "ethcore", features = ["parity"] }
@@ -45,11 +45,11 @@ ethcore-network = { path = "util/network" }
 ethcore-private-tx = { path = "ethcore/private-tx" }
 ethcore-service = { path = "ethcore/service" }
 ethcore-sync = { path = "ethcore/sync" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 ethkey = { path = "accounts/ethkey" }
 ethstore = { path = "accounts/ethstore" }
 node-filter = { path = "ethcore/node-filter" }
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 cli-signer= { path = "cli-signer" }
 parity-daemonize = "0.3"
 parity-hash-fetch = { path = "updater/hash-fetch" }
@@ -63,7 +63,7 @@ parity-whisper = { path = "whisper" }
 parity-path = "0.1"
 dir = { path = "util/dir" }
 panic_hook = { path = "util/panic-hook" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
 migration-rocksdb = { path = "util/migration-rocksdb" }
 kvdb = "0.1"
 kvdb-rocksdb = "0.1.3"
@@ -73,8 +73,6 @@ ethcore-secretstore = { path = "secret-store", optional = true }

 registrar = { path = "util/registrar" }

-parity-util-mem = { version = "0.1", features = ["jemalloc-global"] }
-
 [build-dependencies]
 rustc_version = "0.2"

@@ -83,6 +81,7 @@ pretty_assertions = "0.1"
 ipnetwork = "0.12.6"
 tempdir = "0.3"
 fake-fetch = { path = "util/fake-fetch" }
+lazy_static = "1.2.0"

 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.4", features = ["winsock2", "winuser", "shellapi"] }
@@ -119,6 +118,10 @@ path = "parity/lib.rs"
 path = "parity/main.rs"
 name = "parity"

+[profile.test]
+lto = false
+opt-level = 3 # makes tests slower to compile, but faster to run
+
 [profile.release]
 debug = false
 lto = true
@@ -139,5 +142,8 @@ members = [
 	"util/keccak-hasher",
 	"util/patricia-trie-ethereum",
 	"util/fastmap",
-	"util/time-utils",
+	"util/time-utils"
 ]
+
+[patch.crates-io]
+heapsize = { git = "https://github.com/cheme/heapsize.git", branch = "ec-macfix" }
--- a/README.md
+++ b/README.md
@@ -7,25 +7,6 @@
 <p align="center"><a href="https://gitlab.parity.io/parity/parity-ethereum/commits/master" target="_blank"><img src="https://gitlab.parity.io/parity/parity-ethereum/badges/master/build.svg" /></a>
 <a href="https://www.gnu.org/licenses/gpl-3.0.en.html" target="_blank"><img src="https://img.shields.io/badge/license-GPL%20v3-green.svg" /></a></p>

-## Table of Contents
-
-1. [Description](#chapter-001)
-2. [Technical Overview](#chapter-002)
-3. [Building](#chapter-003)<br>
-  3.1 [Building Dependencies](#chapter-0031)<br>
-  3.2 [Building from Source Code](#chapter-0032)<br>
-  3.3 [Simple One-Line Installer for Mac and Linux](#chapter-0033)<br>
-  3.4 [Starting Parity Ethereum](#chapter-0034)
-4. [Testing](#chapter-004)
-5. [Documentation](#chapter-005)
-6. [Toolchain](#chapter-006)
-7. [Community](#chapter-007)
-8. [Contributing](#chapter-008)
-9. [License](#chapter-009)
-
-
-## 1. Description <a id="chapter-001"></a>
-
 **Built for mission-critical use**: Miners, service providers, and exchanges need fast synchronisation and maximum uptime. Parity Ethereum provides the core infrastructure essential for speedy and reliable services.

 - Clean, modular codebase for easy customisation
@@ -34,7 +15,7 @@
 - Synchronise in hours, not days with Warp Sync
 - Modular for light integration into your service or product

-## 2. Technical Overview <a id="chapter-002"></a>
+## Technical Overview

 Parity Ethereum's goal is to be the fastest, lightest, and most secure Ethereum client. We are developing Parity Ethereum using the sophisticated and cutting-edge **Rust programming language**. Parity Ethereum is licensed under the GPLv3 and can be used for all your Ethereum needs.

@@ -44,9 +25,7 @@ If you run into problems while using Parity Ethereum, check out the [wiki for do

 Parity Ethereum's current beta-release is 2.1. You can download it at [the releases page](https://github.com/paritytech/parity-ethereum/releases) or follow the instructions below to build from source. Please, mind the [CHANGELOG.md](CHANGELOG.md) for a list of all changes between different versions.

-## 3. Building <a id="chapter-003"></a>
-
-### 3.1 Build Dependencies <a id="chapter-0031"></a>
+## Build Dependencies

 Parity Ethereum requires **latest stable Rust version** to build.

@@ -57,7 +36,7 @@ We recommend installing Rust through [rustup](https://www.rustup.rs/). If you do
  $ curl https://sh.rustup.rs -sSf | sh
  ```

-  Parity Ethereum also requires `gcc`, `g++`, `pkg-config`, `file`, `make`, and `cmake` packages to be installed.
+  Parity Ethereum also requires `gcc`, `g++`, `libudev-dev`, `pkg-config`, `file`, `make`, and `cmake` packages to be installed.

 - OSX:
  ```bash
@@ -66,7 +45,7 @@ We recommend installing Rust through [rustup](https://www.rustup.rs/). If you do

  `clang` is required. It comes with Xcode command line tools or can be installed with homebrew.

- Windows:  
+- Windows
  Make sure you have Visual Studio 2015 with C++ support installed. Next, download and run the `rustup` installer from
  https://static.rust-lang.org/rustup/dist/x86_64-pc-windows-msvc/rustup-init.exe, start "VS2015 x64 Native Tools Command Prompt", and use the following command to install and set up the `msvc` toolchain:
  ```bash
@@ -79,7 +58,7 @@ Once you have `rustup` installed, then you need to install:

 Make sure that these binaries are in your `PATH`. After that, you should be able to build Parity Ethereum from source.

-### 3.2 Build from Source Code <a id="chapter-0032"></a>
+## Build from Source Code

 ```bash
 # download Parity Ethereum code
@@ -116,7 +95,7 @@ or
 $ git checkout beta
 ```

-### 3.3 Simple One-Line Installer for Mac and Linux <a id="chapter-0033"></a>
+## Simple One-Line Installer for Mac and Linux

 ```bash
 bash <(curl https://get.parity.io -L)
@@ -128,9 +107,9 @@ The one-line installer always defaults to the latest beta release. To install a
 bash <(curl https://get.parity.io -L) -r stable
 ```

-### 3.4 Starting Parity Ethereum <a id="chapter-0034"></a>
+## Start Parity Ethereum

-#### Manually
+### Manually

 To start Parity Ethereum manually, just run

@@ -140,7 +119,7 @@ $ ./target/release/parity

 so Parity Ethereum begins syncing the Ethereum blockchain.

-#### Using `systemd` service file
+### Using `systemd` service file

 To start Parity Ethereum as a regular user using `systemd` init:

@@ -149,225 +128,17 @@ To start Parity Ethereum as a regular user using `systemd` init:
 2. Copy release to bin folder, write `sudo install ./target/release/parity /usr/bin/parity`
 3. To configure Parity Ethereum, write a `/etc/parity/config.toml` config file, see [Configuring Parity Ethereum](https://paritytech.github.io/wiki/Configuring-Parity) for details.

-## 4. Testing <a id="chapter-004"></a>
-
-You can run tests with the following commands:
-
-* **All** packages
-  ```
-  cargo test --all
-  ```
-
-* Specific package
-  ```
-  cargo test --package <spec>
-  ```
-
-Replace `<spec>` with one of the packages from the [package list](#package-list) (e.g. `cargo test --package evmbin`).
-
-You can show your logs in the test output by passing `--nocapture` (i.e. `cargo test --package evmbin -- --nocapture`)
-
-## 5. Documentation <a id="chapter-005"></a>
-
-Official website: https://parity.io
-
-Be sure to [check out our wiki](https://wiki.parity.io) for more information.
-
-### Viewing documentation for Parity Ethereum packages
-
-You can generate documentation for Parity Ethereum Rust packages that automatically opens in your web browser using [rustdoc with Cargo](https://doc.rust-lang.org/rustdoc/what-is-rustdoc.html#using-rustdoc-with-cargo) (of the The Rustdoc Book), by running the the following commands:
-
-* **All** packages
-  ```
-  cargo doc --document-private-items --open
-  ```
-
-* Specific package
-  ```
-  cargo doc --package <spec> -- --document-private-items --open
-  ```
-
-Use`--document-private-items` to also view private documentation and `--no-deps` to exclude building documentation for dependencies.
-
-Replacing `<spec>` with one of the following from the details section below (i.e. `cargo doc --package parity-ethereum --open`):
-
-<a id="package-list"></a>
-**Package List**
-<details><p>
-
-* Parity Ethereum (EthCore) Client Application
-  ```bash
-  parity-ethereum
-  ```
-* Parity Ethereum Account Management, Key Management Tool, and Keys Generator
-  ```bash
-  ethcore-accounts, ethkey-cli, ethstore, ethstore-cli
-  ```
-* Parity Chain Specification
-  ```bash
-  chainspec
-  ```
-* Parity CLI Signer Tool & RPC Client
-  ```bash
-  cli-signer parity-rpc-client
-  ```
-* Parity Ethereum Ethash & ProgPoW Implementations
-  ```bash
-  ethash
-  ```
-* Parity (EthCore) Library
-  ```bash
-  ethcore
-  ```
-  * Parity Ethereum Blockchain Database, Test Generator, Configuration,
-Caching, Importing Blocks, and Block Information
-    ```bash
-    ethcore-blockchain
-    ```
-  * Parity Ethereum (EthCore) Contract Calls and Blockchain Service & Registry Information
-    ```bash
-    ethcore-call-contract
-    ```
-  * Parity Ethereum (EthCore) Database Access & Utilities, Database Cache Manager
-    ```bash
-    ethcore-db
-    ```
-  * Parity Ethereum Virtual Machine (EVM) Rust Implementation
-    ```bash
-    evm
-    ```
-  * Parity Ethereum (EthCore) Light Client Implementation
-    ```bash
-    ethcore-light
-    ```
-  * Parity Smart Contract based Node Filter, Manage Permissions of Network Connections
-    ```bash
-    node-filter
-    ```
-  * Parity Private Transactions
-    ```bash
-    ethcore-private-tx
-    ```
-  * Parity Ethereum (EthCore) Client & Network Service Creation & Registration with the I/O Subsystem
-    ```bash
-    ethcore-service
-    ```
-  * Parity Ethereum (EthCore) Blockchain Synchronization
-    ```bash
-    ethcore-sync
-    ```
-  * Parity Ethereum Common Types
-    ```bash
-    common-types
-    ```
-  * Parity Ethereum Virtual Machines (VM) Support Library
-    ```bash
-    vm
-    ```
-  * Parity Ethereum WASM Interpreter
-    ```bash
-    wasm
-    ```
-  * Parity Ethereum WASM Test Runner
-    ```bash
-    pwasm-run-test
-    ```
-  * Parity EVM Implementation
-    ```bash
-    evmbin
-    ```
-  * Parity Ethereum IPFS-compatible API
-    ```bash
-    parity-ipfs-api
-    ```
-  * Parity Ethereum JSON Deserialization
-    ```bash
-    ethjson
-    ```
-  * Parity Ethereum State Machine Generalization for Consensus Engines
-    ```bash
-    parity-machine
-    ```
-* Parity Ethereum (EthCore) Miner Interface
-  ```bash
-  ethcore-miner parity-local-store price-info ethcore-stratum using_queue
-  ```
-* Parity Ethereum (EthCore) Logger Implementation
-  ```bash
-  ethcore-logger
-  ```
-* C bindings library for the Parity Ethereum client
-  ```bash
-  parity-clib
-  ```
-* Parity Ethereum JSON-RPC Servers
-  ```bash
-  parity-rpc
-  ```
-* Parity Ethereum (EthCore) Secret Store
-  ```bash
-  ethcore-secretstore
-  ```
-* Parity Updater Service
-  ```bash
-  parity-updater parity-hash-fetch
-  ```
-* Parity Core Libraries (Parity Util)
-  ```bash
-  ethcore-bloom-journal blooms-db dir eip-712 fake-fetch fastmap fetch ethcore-io
-  journaldb keccak-hasher len-caching-lock macros memory-cache memzero
-  migration-rocksdb ethcore-network ethcore-network-devp2p panic_hook
-  patricia-trie-ethereum registrar rlp_compress rlp_derive parity-runtime stats
-  time-utils triehash-ethereum unexpected parity-version
-  ```
-* Parity Whisper Protocol Implementation
-  ```bash
-  parity-whisper whisper-cli
-  ```
-
-</p></details>
-
-### Contributing to documentation for Parity Ethereum packages
-
-[Document source code](https://doc.rust-lang.org/1.9.0/book/documentation.html) for Parity Ethereum packages by annotating the source code with documentation comments.
-
-Example (generic documentation comment):
-```markdown
-/// Summary
-///
-/// Description
-///
-/// # Panics
-///
-/// # Errors
-///
-/// # Safety
-///
-/// # Examples
-///
-/// Summary of Example 1
-///
-/// ```rust
-/// // insert example 1 code here for use with documentation as tests
-/// ```
-///
-```
-
-## 6. Toolchain <a id="chapter-006"></a>
+## Parity Ethereum toolchain

 In addition to the Parity Ethereum client, there are additional tools in this repository available:

- [evmbin](./evmbin) - Parity Ethereum EVM Implementation.
- [ethstore](./accounts/ethstore) - Parity Ethereum Key Management.
- [ethkey](./accounts/ethkey) - Parity Ethereum Keys Generator.
- [whisper](./whisper) - Parity Ethereum Whisper-v2 PoC Implementation.
+- [evmbin](https://github.com/paritytech/parity-ethereum/blob/master/evmbin/) - EVM implementation for Parity Ethereum.
+- [ethabi](https://github.com/paritytech/ethabi) - Parity Ethereum function calls encoding.
+- [ethstore](https://github.com/paritytech/parity-ethereum/blob/master/accounts/ethstore) - Parity Ethereum key management.
+- [ethkey](https://github.com/paritytech/parity-ethereum/blob/master/accounts/ethkey) - Parity Ethereum keys generator.
+- [whisper](https://github.com/paritytech/parity-ethereum/blob/master/whisper/) - Implementation of Whisper-v2 PoC.

-The following tool is available in a separate repository:
- [ethabi](https://github.com/paritytech/ethabi) - Parity Ethereum Encoding of Function Calls. [Docs here](https://crates.io/crates/ethabi)
-
-## 7. Community <a id="chapter-007"></a>
-
-### Join the chat!
+## Join the chat!

 Questions? Get in touch with us on Gitter:
 [![Gitter: Parity](https://img.shields.io/badge/gitter-parity-4AB495.svg)](https://gitter.im/paritytech/parity)
@@ -378,14 +149,8 @@ Questions? Get in touch with us on Gitter:
 Alternatively, join our community on Matrix:
 [![Riot: +Parity](https://img.shields.io/badge/riot-%2Bparity%3Amatrix.parity.io-orange.svg)](https://riot.im/app/#/group/+parity:matrix.parity.io)

-## 8. Contributing <a id="chapter-008"></a>
+## Documentation

-An introduction has been provided in the ["So You Want to be a Core Developer" presentation slides by Hernando Castano](http://tiny.cc/contrib-to-parity-eth). Additional guidelines are provided in [CONTRIBUTING](./.github/CONTRIBUTING.md).
+Official website: https://parity.io

-### Contributor Code of Conduct
-
-[CODE_OF_CONDUCT](./.github/CODE_OF_CONDUCT.md)
-
-## 9. License <a id="chapter-009"></a>
-
-[LICENSE](./LICENSE)
+Be sure to [check out our wiki](https://wiki.parity.io) for more information.
--- a/accounts/Cargo.toml
+++ b/accounts/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-description = "Parity Ethereum Account Management"
+description = "Account management for Parity Ethereum"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "ethcore-accounts"
@@ -8,6 +8,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"

 [dependencies]
+common-types = { path = "../ethcore/types" }
 ethkey = { path = "ethkey" }
 ethstore = { path = "ethstore" }
 log = "0.4"
@@ -16,6 +17,12 @@ serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"

+[target.'cfg(any(target_os = "linux", target_os = "macos", target_os = "windows"))'.dependencies]
+hardware-wallet = { path = "hw" }
+
+[target.'cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))'.dependencies]
+fake-hardware-wallet = { path = "fake-hardware-wallet" }
+
 [dev-dependencies]
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 tempdir = "0.3"
--- a/accounts/ethkey/Cargo.toml
+++ b/accounts/ethkey/Cargo.toml
@@ -1,21 +1,21 @@
 [package]
-description = "Parity Ethereum Keys Generator"
 name = "ethkey"
 version = "0.3.0"
 authors = ["Parity Technologies <admin@parity.io>"]

 [dependencies]
+byteorder = "1.0"
 edit-distance = "2.0"
-parity-crypto = "0.4.0"
+parity-crypto = "0.3.0"
 eth-secp256k1 = { git = "https://github.com/paritytech/rust-secp256k1" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 lazy_static = "1.0"
 log = "0.4"
-parity-wordlist = "1.3"
+memzero = { path = "../../util/memzero" }
+parity-wordlist = "1.2"
 quick-error = "1.2.2"
-rand = "0.6"
+rand = "0.4"
 rustc-hex = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
 tiny-keccak = "1.4"
-zeroize = "0.9.1"
--- a/accounts/ethkey/README.md
+++ b/accounts/ethkey/README.md
@@ -5,7 +5,7 @@ Parity Ethereum keys generator.
 ### Usage

 ```
-Parity Ethereum Keys Generator.
+Parity Ethereum keys generator.
  Copyright 2015-2019 Parity Technologies (UK) Ltd.

 Usage:
--- a/accounts/ethkey/cli/Cargo.toml
+++ b/accounts/ethkey/cli/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Keys Generator CLI"
 name = "ethkey-cli"
 version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
--- a/accounts/ethkey/src/brain_prefix.rs
+++ b/accounts/ethkey/src/brain_prefix.rs
@@ -47,7 +47,7 @@ impl Generator for BrainPrefix {
 		for _ in 0..self.iterations {
 			let phrase = wordlist::random_phrase(self.no_of_words);
 			let keypair = Brain::new(phrase.clone()).generate().unwrap();
-			if keypair.address().as_ref().starts_with(&self.prefix) {
+			if keypair.address().starts_with(&self.prefix) {
 				self.last_phrase = phrase;
 				return Ok(keypair)
 			}
@@ -65,6 +65,6 @@ mod tests {
 	fn prefix_generator() {
 		let prefix = vec![0x00u8];
 		let keypair = BrainPrefix::new(prefix.clone(), usize::max_value(), 12).generate().unwrap();
-		assert!(keypair.address().as_bytes().starts_with(&prefix));
+		assert!(keypair.address().starts_with(&prefix));
 	}
 }
--- a/accounts/ethkey/src/crypto.rs
+++ b/accounts/ethkey/src/crypto.rs
@@ -57,7 +57,7 @@ pub mod ecdh {
 		};

 		let publ = key::PublicKey::from_slice(context, &pdata)?;
-		let sec = key::SecretKey::from_slice(context, secret.as_bytes())?;
+		let sec = key::SecretKey::from_slice(context, &secret)?;
 		let shared = ecdh::SharedSecret::new_raw(context, &publ, &sec);

 		Secret::from_unsafe_slice(&shared[0..32])
@@ -89,12 +89,12 @@ pub mod ecies {
 		msg[0] = 0x04u8;
 		{
 			let msgd = &mut msg[1..];
-			msgd[0..64].copy_from_slice(r.public().as_bytes());
+			msgd[0..64].copy_from_slice(r.public());
 			let iv = H128::random();
-			msgd[64..80].copy_from_slice(iv.as_bytes());
+			msgd[64..80].copy_from_slice(&iv);
 			{
 				let cipher = &mut msgd[(64 + 16)..(64 + 16 + plain.len())];
-				aes::encrypt_128_ctr(ekey, iv.as_bytes(), plain, cipher)?;
+				aes::encrypt_128_ctr(ekey, &iv, plain, cipher)?;
 			}
 			let mut hmac = hmac::Signer::with(&mkey);
 			{
@@ -156,7 +156,7 @@ pub mod ecies {
 			let mut hasher = digest::Hasher::sha256();
 			let ctrs = [(ctr >> 24) as u8, (ctr >> 16) as u8, (ctr >> 8) as u8, ctr as u8];
 			hasher.update(&ctrs);
-			hasher.update(secret.as_bytes());
+			hasher.update(secret);
 			hasher.update(s1);
 			let d = hasher.finish();
 			&mut dest[written..(written + 32)].copy_from_slice(&d);
--- a/accounts/ethkey/src/extended.rs
+++ b/accounts/ethkey/src/extended.rs
@@ -35,8 +35,9 @@ impl Label for u32 {
 	fn len() -> usize { 4 }

 	fn store(&self, target: &mut [u8]) {
-		let bytes = self.to_be_bytes();
-		target[0..4].copy_from_slice(&bytes);
+		use byteorder::{BigEndian, ByteOrder};
+
+		BigEndian::write_u32(&mut target[0..4], *self);
 	}
 }

@@ -63,7 +64,7 @@ impl Label for H256 {
 	fn len() -> usize { 32 }

 	fn store(&self, target: &mut [u8]) {
-		(&mut target[0..32]).copy_from_slice(self.as_bytes());
+		self.copy_to(&mut target[0..32]);
 	}
 }

@@ -179,7 +180,7 @@ impl ExtendedKeyPair {
 	pub fn with_seed(seed: &[u8]) -> Result<ExtendedKeyPair, DerivationError> {
 		let (master_key, chain_code) = derivation::seed_pair(seed);
 		Ok(ExtendedKeyPair::with_secret(
-			Secret::from_unsafe_slice(master_key.as_bytes()).map_err(|_| DerivationError::InvalidSeed)?,
+			Secret::from_unsafe_slice(&*master_key).map_err(|_| DerivationError::InvalidSeed)?,
 			chain_code,
 		))
 	}
@@ -207,13 +208,12 @@ impl ExtendedKeyPair {
 // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
 mod derivation {
 	use parity_crypto::hmac;
-	use ethereum_types::{BigEndianHash, U256, U512, H512, H256};
+	use ethereum_types::{U256, U512, H512, H256};
 	use secp256k1::key::{SecretKey, PublicKey};
 	use SECP256K1;
 	use keccak;
 	use math::curve_order;
 	use super::{Label, Derivation};
-	use std::convert::TryInto;

 	#[derive(Debug)]
 	pub enum Error {
@@ -237,18 +237,18 @@ mod derivation {
 	}

 	fn hmac_pair(data: &[u8], private_key: H256, chain_code: H256) -> (H256, H256) {
-		let private: U256 = private_key.into_uint();
+		let private: U256 = private_key.into();

 		// produces 512-bit derived hmac (I)
-		let skey = hmac::SigKey::sha512(chain_code.as_bytes());
+		let skey = hmac::SigKey::sha512(&*chain_code);
 		let i_512 = hmac::sign(&skey, &data[..]);

 		// left most 256 bits are later added to original private key
-		let hmac_key: U256 = H256::from_slice(&i_512[0..32]).into_uint();
+		let hmac_key: U256 = H256::from_slice(&i_512[0..32]).into();
 		// right most 256 bits are new chain code for later derivations
-		let next_chain_code = H256::from_slice(&i_512[32..64]);
+		let next_chain_code = H256::from(&i_512[32..64]);

-		let child_key = BigEndianHash::from_uint(&private_add(hmac_key, private));
+		let child_key = private_add(hmac_key, private).into();
 		(child_key, next_chain_code)
 	}

@@ -257,7 +257,7 @@ mod derivation {
 	fn private_soft<T>(private_key: H256, chain_code: H256, index: T) -> (H256, H256) where T: Label {
 		let mut data = vec![0u8; 33 + T::len()];

-		let sec_private = SecretKey::from_slice(&SECP256K1, private_key.as_bytes())
+		let sec_private = SecretKey::from_slice(&SECP256K1, &*private_key)
 			.expect("Caller should provide valid private key");
 		let sec_public = PublicKey::from_secret_key(&SECP256K1, &sec_private)
 			.expect("Caller should provide valid private key");
@@ -276,7 +276,7 @@ mod derivation {
 	// corresponding public keys of the original and derived private keys
 	fn private_hard<T>(private_key: H256, chain_code: H256, index: T) -> (H256, H256) where T: Label {
 		let mut data: Vec<u8> = vec![0u8; 33 + T::len()];
-		let private: U256 = private_key.into_uint();
+		let private: U256 = private_key.into();

 		// 0x00 (padding) -- private_key --  index
 		//  0             --    1..33    -- 33..end
@@ -293,8 +293,9 @@ mod derivation {

 	// todo: surely can be optimized
 	fn modulo(u1: U512, u2: U256) -> U256 {
-		let m = u1 % U512::from(u2);
-		m.try_into().expect("U512 modulo U256 should fit into U256; qed")
+		let dv = u1 / U512::from(u2);
+		let md = u1 - (dv * U512::from(u2));
+		md.into()
 	}

 	pub fn public<T>(public_key: H512, chain_code: H256, derivation: Derivation<T>) -> Result<(H512, H256), Error> where T: Label {
@@ -305,7 +306,7 @@ mod derivation {

 		let mut public_sec_raw = [0u8; 65];
 		public_sec_raw[0] = 4;
-		public_sec_raw[1..65].copy_from_slice(public_key.as_bytes());
+		public_sec_raw[1..65].copy_from_slice(&*public_key);
 		let public_sec = PublicKey::from_slice(&SECP256K1, &public_sec_raw).map_err(|_| Error::InvalidPoint)?;
 		let public_serialized = public_sec.serialize_vec(&SECP256K1, true);

@@ -316,15 +317,15 @@ mod derivation {
 		index.store(&mut data[33..(33 + T::len())]);

 		// HMAC512SHA produces [derived private(256); new chain code(256)]
-		let skey = hmac::SigKey::sha512(chain_code.as_bytes());
+		let skey = hmac::SigKey::sha512(&*chain_code);
 		let i_512 = hmac::sign(&skey, &data[..]);

-		let new_private = H256::from_slice(&i_512[0..32]);
-		let new_chain_code = H256::from_slice(&i_512[32..64]);
+		let new_private = H256::from(&i_512[0..32]);
+		let new_chain_code = H256::from(&i_512[32..64]);

 		// Generated private key can (extremely rarely) be out of secp256k1 key field
-		if curve_order() <= new_private.into_uint() { return Err(Error::MissingIndex); }
-		let new_private_sec = SecretKey::from_slice(&SECP256K1, new_private.as_bytes())
+		if curve_order() <= new_private.clone().into() { return Err(Error::MissingIndex); }
+		let new_private_sec = SecretKey::from_slice(&SECP256K1, &*new_private)
 			.expect("Private key belongs to the field [0..CURVE_ORDER) (checked above); So initializing can never fail; qed");
 		let mut new_public = PublicKey::from_secret_key(&SECP256K1, &new_private_sec)
 			.expect("Valid private key produces valid public key");
@@ -336,7 +337,7 @@ mod derivation {
 		let serialized = new_public.serialize_vec(&SECP256K1, false);

 		Ok((
-			H512::from_slice(&serialized[1..65]),
+			H512::from(&serialized[1..65]),
 			new_chain_code,
 		))
 	}
@@ -347,18 +348,18 @@ mod derivation {

 	pub fn chain_code(secret: H256) -> H256 {
 		// 10,000 rounds of sha3
-		let mut running_sha3 = sha3(secret.as_bytes());
-		for _ in 0..99999 { running_sha3 = sha3(running_sha3.as_bytes()); }
+		let mut running_sha3 = sha3(&*secret);
+		for _ in 0..99999 { running_sha3 = sha3(&*running_sha3); }
 		running_sha3
 	}

 	pub fn point(secret: H256) -> Result<H512, Error> {
-		let sec = SecretKey::from_slice(&SECP256K1, secret.as_bytes())
+		let sec = SecretKey::from_slice(&SECP256K1, &*secret)
 			.map_err(|_| Error::InvalidPoint)?;
 		let public_sec = PublicKey::from_secret_key(&SECP256K1, &sec)
 			.map_err(|_| Error::InvalidPoint)?;
 		let serialized = public_sec.serialize_vec(&SECP256K1, false);
-		Ok(H512::from_slice(&serialized[1..65]))
+		Ok(H512::from(&serialized[1..65]))
 	}

 	pub fn seed_pair(seed: &[u8]) -> (H256, H256) {
@@ -377,13 +378,12 @@ mod tests {
 	use super::{ExtendedSecret, ExtendedPublic, ExtendedKeyPair};
 	use secret::Secret;
 	use std::str::FromStr;
-	use ethereum_types::{H128, H256, H512};
+	use ethereum_types::{H128, H256};
 	use super::{derivation, Derivation};

 	fn master_chain_basic() -> (H256, H256) {
 		let seed = H128::from_str("000102030405060708090a0b0c0d0e0f")
 			.expect("Seed should be valid H128")
-			.as_bytes()
 			.to_vec();

 		derivation::seed_pair(&*seed)
@@ -399,39 +399,27 @@ mod tests {
 	#[test]
 	fn smoky() {
 		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
-		let extended_secret = ExtendedSecret::with_code(secret.clone(), H256::zero());
+		let extended_secret = ExtendedSecret::with_code(secret.clone(), 0u64.into());

 		// hardened
 		assert_eq!(&**extended_secret.as_raw(), &*secret);
-		assert_eq!(
-			**extended_secret.derive(2147483648.into()).as_raw(),
-			H256::from_str("0927453daed47839608e414a3738dfad10aed17c459bbd9ab53f89b026c834b6").unwrap(),
-		);
-		assert_eq!(
-			**extended_secret.derive(2147483649.into()).as_raw(),
-			H256::from_str("44238b6a29c6dcbe9b401364141ba11e2198c289a5fed243a1c11af35c19dc0f").unwrap(),
-		);
+		assert_eq!(&**extended_secret.derive(2147483648.into()).as_raw(), &"0927453daed47839608e414a3738dfad10aed17c459bbd9ab53f89b026c834b6".into());
+		assert_eq!(&**extended_secret.derive(2147483649.into()).as_raw(), &"44238b6a29c6dcbe9b401364141ba11e2198c289a5fed243a1c11af35c19dc0f".into());

 		// normal
-		assert_eq!(**extended_secret.derive(0.into()).as_raw(), H256::from_str("bf6a74e3f7b36fc4c96a1e12f31abc817f9f5904f5a8fc27713163d1f0b713f6").unwrap());
-		assert_eq!(**extended_secret.derive(1.into()).as_raw(), H256::from_str("bd4fca9eb1f9c201e9448c1eecd66e302d68d4d313ce895b8c134f512205c1bc").unwrap());
-		assert_eq!(**extended_secret.derive(2.into()).as_raw(), H256::from_str("86932b542d6cab4d9c65490c7ef502d89ecc0e2a5f4852157649e3251e2a3268").unwrap());
+		assert_eq!(&**extended_secret.derive(0.into()).as_raw(), &"bf6a74e3f7b36fc4c96a1e12f31abc817f9f5904f5a8fc27713163d1f0b713f6".into());
+		assert_eq!(&**extended_secret.derive(1.into()).as_raw(), &"bd4fca9eb1f9c201e9448c1eecd66e302d68d4d313ce895b8c134f512205c1bc".into());
+		assert_eq!(&**extended_secret.derive(2.into()).as_raw(), &"86932b542d6cab4d9c65490c7ef502d89ecc0e2a5f4852157649e3251e2a3268".into());

 		let extended_public = ExtendedPublic::from_secret(&extended_secret).expect("Extended public should be created");
 		let derived_public = extended_public.derive(0.into()).expect("First derivation of public should succeed");
-		assert_eq!(
-			*derived_public.public(),
-			H512::from_str("f7b3244c96688f92372bfd4def26dc4151529747bab9f188a4ad34e141d47bd66522ff048bc6f19a0a4429b04318b1a8796c000265b4fa200dae5f6dda92dd94").unwrap(),
-		);
+		assert_eq!(&*derived_public.public(), &"f7b3244c96688f92372bfd4def26dc4151529747bab9f188a4ad34e141d47bd66522ff048bc6f19a0a4429b04318b1a8796c000265b4fa200dae5f6dda92dd94".into());

 		let keypair = ExtendedKeyPair::with_secret(
 			Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap(),
-			H256::from_low_u64_be(64),
-		);
-		assert_eq!(
-			**keypair.derive(2147483648u32.into()).expect("Derivation of keypair should succeed").secret().as_raw(),
-			H256::from_str("edef54414c03196557cf73774bc97a645c9a1df2164ed34f0c2a78d1375a930c").unwrap(),
+			064.into(),
 		);
+		assert_eq!(&**keypair.derive(2147483648u32.into()).expect("Derivation of keypair should succeed").secret().as_raw(), &"edef54414c03196557cf73774bc97a645c9a1df2164ed34f0c2a78d1375a930c".into());
 	}

 	#[test]
@@ -439,7 +427,7 @@ mod tests {
 		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
 		let derivation_secret = H256::from_str("51eaf04f9dbbc1417dc97e789edd0c37ecda88bac490434e367ea81b71b7b015").unwrap();

-		let extended_secret = ExtendedSecret::with_code(secret.clone(), H256::zero());
+		let extended_secret = ExtendedSecret::with_code(secret.clone(), 0u64.into());
 		let extended_public = ExtendedPublic::from_secret(&extended_secret).expect("Extended public should be created");

 		let derived_secret0 = extended_secret.derive(Derivation::Soft(derivation_secret));
@@ -454,18 +442,15 @@ mod tests {
 	fn h256_hard() {
 		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
 		let derivation_secret = H256::from_str("51eaf04f9dbbc1417dc97e789edd0c37ecda88bac490434e367ea81b71b7b015").unwrap();
-		let extended_secret = ExtendedSecret::with_code(secret.clone(), H256::from_low_u64_be(1));
+		let extended_secret = ExtendedSecret::with_code(secret.clone(), 1u64.into());

-		assert_eq!(
-			**extended_secret.derive(Derivation::Hard(derivation_secret)).as_raw(),
-			H256::from_str("2bc2d696fb744d77ff813b4a1ef0ad64e1e5188b622c54ba917acc5ebc7c5486").unwrap(),
-		);
+		assert_eq!(&**extended_secret.derive(Derivation::Hard(derivation_secret)).as_raw(), &"2bc2d696fb744d77ff813b4a1ef0ad64e1e5188b622c54ba917acc5ebc7c5486".into());
 	}

 	#[test]
 	fn match_() {
 		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
-		let extended_secret = ExtendedSecret::with_code(secret.clone(), H256::from_low_u64_be(1));
+		let extended_secret = ExtendedSecret::with_code(secret.clone(), 1.into());
 		let extended_public = ExtendedPublic::from_secret(&extended_secret).expect("Extended public should be created");

 		let derived_secret0 = extended_secret.derive(0.into());
@@ -480,7 +465,6 @@ mod tests {
 	fn test_seeds() {
 		let seed = H128::from_str("000102030405060708090a0b0c0d0e0f")
 			.expect("Seed should be valid H128")
-			.as_bytes()
 			.to_vec();

 		// private key from bitcoin test vector
--- a/accounts/ethkey/src/keypair.rs
+++ b/accounts/ethkey/src/keypair.rs
@@ -16,13 +16,14 @@

 use std::fmt;
 use secp256k1::key;
+use rustc_hex::ToHex;
+use keccak::Keccak256;
 use super::{Secret, Public, Address, SECP256K1, Error};
-use parity_crypto::Keccak256 as _;

 pub fn public_to_address(public: &Public) -> Address {
 	let hash = public.keccak256();
-	let mut result = Address::zero();
-	result.as_bytes_mut().copy_from_slice(&hash[12..]);
+	let mut result = Address::default();
+	result.copy_from_slice(&hash[12..]);
 	result
 }

@@ -35,9 +36,9 @@ pub struct KeyPair {

 impl fmt::Display for KeyPair {
 	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-		writeln!(f, "secret:  {:x}", self.secret)?;
-		writeln!(f, "public:  {:x}", self.public)?;
-		write!(f, "address: {:x}", self.address())
+		writeln!(f, "secret:  {}", self.secret.to_hex())?;
+		writeln!(f, "public:  {}", self.public.to_hex())?;
+		write!(f, "address: {}", self.address().to_hex())
 	}
 }

@@ -50,7 +51,7 @@ impl KeyPair {
 		let serialized = pub_key.serialize_vec(context, false);

 		let mut public = Public::default();
-		public.as_bytes_mut().copy_from_slice(&serialized[1..65]);
+		public.copy_from_slice(&serialized[1..65]);

 		let keypair = KeyPair {
 			secret: secret,
@@ -69,7 +70,7 @@ impl KeyPair {
 		let serialized = publ.serialize_vec(context, false);
 		let secret = Secret::from(sec);
 		let mut public = Public::default();
-		public.as_bytes_mut().copy_from_slice(&serialized[1..65]);
+		public.copy_from_slice(&serialized[1..65]);

 		KeyPair {
 			secret: secret,
--- a/accounts/ethkey/src/lib.rs
+++ b/accounts/ethkey/src/lib.rs
@@ -16,9 +16,11 @@

 // #![warn(missing_docs)]

+extern crate byteorder;
 extern crate edit_distance;
 extern crate parity_crypto;
 extern crate ethereum_types;
+extern crate memzero;
 extern crate parity_wordlist;
 #[macro_use]
 extern crate quick_error;
@@ -27,7 +29,6 @@ extern crate rustc_hex;
 extern crate secp256k1;
 extern crate serde;
 extern crate tiny_keccak;
-extern crate zeroize;

 #[macro_use]
 extern crate lazy_static;
--- a/accounts/ethkey/src/math.rs
+++ b/accounts/ethkey/src/math.rs
@@ -17,7 +17,7 @@
 use super::{SECP256K1, Public, Secret, Error};
 use secp256k1::key;
 use secp256k1::constants::{GENERATOR_X, GENERATOR_Y, CURVE_ORDER};
-use ethereum_types::{BigEndianHash as _, U256, H256};
+use ethereum_types::{U256, H256};

 /// Whether the public key is valid.
 pub fn public_is_valid(public: &Public) -> bool {
@@ -78,7 +78,7 @@ pub fn generation_point() -> Public {

 /// Return secp256k1 elliptic curve order
 pub fn curve_order() -> U256 {
-	H256::from_slice(&CURVE_ORDER).into_uint()
+	H256::from_slice(&CURVE_ORDER).into()
 }

 fn to_secp256k1_public(public: &Public) -> Result<key::PublicKey, Error> {
@@ -93,7 +93,7 @@ fn to_secp256k1_public(public: &Public) -> Result<key::PublicKey, Error> {

 fn set_public(public: &mut Public, key_public: &key::PublicKey) {
 	let key_public_serialized = key_public.serialize_vec(&SECP256K1, false);
-	public.as_bytes_mut().copy_from_slice(&key_public_serialized[1..65]);
+	public.copy_from_slice(&key_public_serialized[1..65]);
 }

 #[cfg(test)]
--- a/accounts/ethkey/src/prefix.rs
+++ b/accounts/ethkey/src/prefix.rs
@@ -37,7 +37,7 @@ impl Generator for Prefix {
 	fn generate(&mut self) -> Result<KeyPair, Error> {
 		for _ in 0..self.iterations {
 			let keypair = Random.generate()?;
-			if keypair.address().as_ref().starts_with(&self.prefix) {
+			if keypair.address().starts_with(&self.prefix) {
 				return Ok(keypair)
 			}
 		}
@@ -54,6 +54,6 @@ mod tests {
 	fn prefix_generator() {
 		let prefix = vec![0xffu8];
 		let keypair = Prefix::new(prefix.clone(), usize::max_value()).generate().unwrap();
-		assert!(keypair.address().as_bytes().starts_with(&prefix));
+		assert!(keypair.address().starts_with(&prefix));
 	}
 }
--- a/accounts/ethkey/src/random.rs
+++ b/accounts/ethkey/src/random.rs
@@ -14,7 +14,7 @@
 // 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 rand::rngs::OsRng;
+use rand::os::OsRng;
 use super::{Generator, KeyPair, SECP256K1};

 /// Randomly generates new keypair, instantiating the RNG each time.
--- a/accounts/ethkey/src/secret.rs
+++ b/accounts/ethkey/src/secret.rs
@@ -21,23 +21,17 @@ use rustc_hex::ToHex;
 use secp256k1::constants::{SECRET_KEY_SIZE as SECP256K1_SECRET_KEY_SIZE};
 use secp256k1::key;
 use ethereum_types::H256;
-use zeroize::Zeroize;
+use memzero::Memzero;
 use {Error, SECP256K1};

 #[derive(Clone, PartialEq, Eq)]
 pub struct Secret {
-	inner: H256,
-}
-
-impl Drop for Secret {
-	fn drop(&mut self) {
-		self.inner.0.zeroize()
-	}
+	inner: Memzero<H256>,
 }

 impl ToHex for Secret {
 	fn to_hex(&self) -> String {
-		format!("{:x}", self.inner)
+		format!("{:x}", *self.inner)
 	}
 }

@@ -65,14 +59,14 @@ impl Secret {
 		if key.len() != 32 {
 			return None
 		}
-		let mut h = H256::zero();
-		h.as_bytes_mut().copy_from_slice(&key[0..32]);
-		Some(Secret { inner: h })
+		let mut h = H256::default();
+		h.copy_from_slice(&key[0..32]);
+		Some(Secret { inner: Memzero::from(h) })
 	}

 	/// Creates zero key, which is invalid for crypto operations, but valid for math operation.
 	pub fn zero() -> Self {
-		Secret { inner: H256::zero() }
+		Secret { inner: Memzero::from(H256::default()) }
 	}

 	/// Imports and validates the key.
@@ -220,7 +214,7 @@ impl FromStr for Secret {

 impl From<[u8; 32]> for Secret {
 	fn from(k: [u8; 32]) -> Self {
-		Secret { inner: H256(k) }
+		Secret { inner: Memzero::from(H256(k)) }
 	}
 }

--- a/accounts/ethkey/src/signature.rs
+++ b/accounts/ethkey/src/signature.rs
@@ -68,44 +68,24 @@ impl Signature {
 	/// Create a signature object from the sig.
 	pub fn from_rsv(r: &H256, s: &H256, v: u8) -> Self {
 		let mut sig = [0u8; 65];
-		sig[0..32].copy_from_slice(r.as_ref());
-		sig[32..64].copy_from_slice(s.as_ref());
+		sig[0..32].copy_from_slice(&r);
+		sig[32..64].copy_from_slice(&s);
 		sig[64] = v;
 		Signature(sig)
 	}

 	/// Check if this is a "low" signature.
 	pub fn is_low_s(&self) -> bool {
-		// "7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0"
-		const MASK: H256 = H256([
-			0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
-			0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
-			0x5D, 0x57, 0x6E, 0x73, 0x57, 0xA4, 0x50, 0x1D,
-			0xDF, 0xE9, 0x2F, 0x46, 0x68, 0x1B, 0x20, 0xA0,
-		]);
-		H256::from_slice(self.s()) <= MASK
+		H256::from_slice(self.s()) <= "7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0".into()
 	}

 	/// Check if each component of the signature is in range.
 	pub fn is_valid(&self) -> bool {
-		// "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141"
-		const MASK: H256 = H256([
-			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe,
-			0xba, 0xae, 0xdc, 0xe6, 0xaf, 0x48, 0xa0, 0x3b,
-			0xbf, 0xd2, 0x5e, 0x8c, 0xd0, 0x36, 0x41, 0x41,
-		]);
-		const ONE: H256 = H256([
-			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
-		]);
-		let r = H256::from_slice(self.r());
-		let s = H256::from_slice(self.s());
 		self.v() <= 1 &&
-			r < MASK && r >= ONE &&
-			s < MASK && s >= ONE
+			H256::from_slice(self.r()) < "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141".into() &&
+			H256::from_slice(self.r()) >= 1.into() &&
+			H256::from_slice(self.s()) < "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141".into() &&
+			H256::from_slice(self.s()) >= 1.into()
 	}
 }

@@ -210,7 +190,7 @@ impl DerefMut for Signature {

 pub fn sign(secret: &Secret, message: &Message) -> Result<Signature, Error> {
 	let context = &SECP256K1;
-	let sec = SecretKey::from_slice(context, secret.as_ref())?;
+	let sec = SecretKey::from_slice(context, &secret)?;
 	let s = context.sign_recoverable(&SecpMessage::from_slice(&message[..])?, &sec)?;
 	let (rec_id, data) = s.serialize_compact(context);
 	let mut data_arr = [0; 65];
@@ -228,7 +208,7 @@ pub fn verify_public(public: &Public, signature: &Signature, message: &Message)

 	let pdata: [u8; 65] = {
 		let mut temp = [4u8; 65];
-		temp[1..65].copy_from_slice(public.as_bytes());
+		temp[1..65].copy_from_slice(&**public);
 		temp
 	};

@@ -253,7 +233,7 @@ pub fn recover(signature: &Signature, message: &Message) -> Result<Public, Error
 	let serialized = pubkey.serialize_vec(context, false);

 	let mut public = Public::default();
-	public.as_bytes_mut().copy_from_slice(&serialized[1..65]);
+	public.copy_from_slice(&serialized[1..65]);
 	Ok(public)
 }

--- a/accounts/ethstore/Cargo.toml
+++ b/accounts/ethstore/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Key Management"
 name = "ethstore"
 version = "0.2.1"
 authors = ["Parity Technologies <admin@parity.io>"]
@@ -7,7 +6,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 log = "0.4"
 libc = "0.2"
-rand = "0.6"
+rand = "0.4"
 ethkey = { path = "../ethkey" }
 serde = "1.0"
 serde_json = "1.0"
@@ -17,12 +16,13 @@ tiny-keccak = "1.4"
 time = "0.1.34"
 itertools = "0.5"
 parking_lot = "0.7"
-parity-crypto = "0.4.0"
-ethereum-types = "0.6.0"
+parity-crypto = "0.3.0"
+ethereum-types = "0.4"
 dir = { path = "../../util/dir" }
 smallvec = "0.6"
 parity-wordlist = "1.0"
 tempdir = "0.3"
+lazy_static = "1.2.0"

 [dev-dependencies]
 matches = "0.1"
--- a/accounts/ethstore/cli/Cargo.toml
+++ b/accounts/ethstore/cli/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Key Management CLI"
 name = "ethstore-cli"
 version = "0.1.1"
 authors = ["Parity Technologies <admin@parity.io>"]
@@ -22,4 +21,4 @@ path = "src/main.rs"
 doc = false

 [dev-dependencies]
-tempdir = "0.3"
+tempdir = "0.3.5"
--- a/accounts/ethstore/src/account/crypto.rs
+++ b/accounts/ethstore/src/account/crypto.rs
@@ -15,6 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use std::str;
+use std::num::NonZeroU32;
 use ethkey::{Password, Secret};
 use {json, Error, crypto};
 use crypto::Keccak256;
@@ -73,12 +74,12 @@ impl From<Crypto> for String {

 impl Crypto {
 	/// Encrypt account secret
-	pub fn with_secret(secret: &Secret, password: &Password, iterations: u32) -> Result<Self, crypto::Error> {
-		Crypto::with_plain(secret.as_ref(), password, iterations)
+	pub fn with_secret(secret: &Secret, password: &Password, iterations: NonZeroU32) -> Result<Self, crypto::Error> {
+		Crypto::with_plain(&*secret, password, iterations)
 	}

 	/// Encrypt custom plain data
-	pub fn with_plain(plain: &[u8], password: &Password, iterations: u32) -> Result<Self, crypto::Error> {
+	pub fn with_plain(plain: &[u8], password: &Password, iterations: NonZeroU32) -> Result<Self, crypto::Error> {
 		let salt: [u8; 32] = Random::random();
 		let iv: [u8; 16] = Random::random();

@@ -159,13 +160,17 @@ impl Crypto {
 #[cfg(test)]
 mod tests {
 	use ethkey::{Generator, Random};
-	use super::{Crypto, Error};
+	use super::{Crypto, Error, NonZeroU32};
+
+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(10240).expect("10240 > 0; qed");
+	}

 	#[test]
 	fn crypto_with_secret_create() {
 		let keypair = Random.generate().unwrap();
 		let passwd = "this is sparta".into();
-		let crypto = Crypto::with_secret(keypair.secret(), &passwd, 10240).unwrap();
+		let crypto = Crypto::with_secret(keypair.secret(), &passwd, *ITERATIONS).unwrap();
 		let secret = crypto.secret(&passwd).unwrap();
 		assert_eq!(keypair.secret(), &secret);
 	}
@@ -173,7 +178,7 @@ mod tests {
 	#[test]
 	fn crypto_with_secret_invalid_password() {
 		let keypair = Random.generate().unwrap();
-		let crypto = Crypto::with_secret(keypair.secret(), &"this is sparta".into(), 10240).unwrap();
+		let crypto = Crypto::with_secret(keypair.secret(), &"this is sparta".into(), *ITERATIONS).unwrap();
 		assert_matches!(crypto.secret(&"this is sparta!".into()), Err(Error::InvalidPassword))
 	}

@@ -181,7 +186,7 @@ mod tests {
 	fn crypto_with_null_plain_data() {
 		let original_data = b"";
 		let passwd = "this is sparta".into();
-		let crypto = Crypto::with_plain(&original_data[..], &passwd, 10240).unwrap();
+		let crypto = Crypto::with_plain(&original_data[..], &passwd, *ITERATIONS).unwrap();
 		let decrypted_data = crypto.decrypt(&passwd).unwrap();
 		assert_eq!(original_data[..], *decrypted_data);
 	}
@@ -190,7 +195,7 @@ mod tests {
 	fn crypto_with_tiny_plain_data() {
 		let original_data = b"{}";
 		let passwd = "this is sparta".into();
-		let crypto = Crypto::with_plain(&original_data[..], &passwd, 10240).unwrap();
+		let crypto = Crypto::with_plain(&original_data[..], &passwd, *ITERATIONS).unwrap();
 		let decrypted_data = crypto.decrypt(&passwd).unwrap();
 		assert_eq!(original_data[..], *decrypted_data);
 	}
@@ -199,7 +204,7 @@ mod tests {
 	fn crypto_with_huge_plain_data() {
 		let original_data: Vec<_> = (1..65536).map(|i| (i % 256) as u8).collect();
 		let passwd = "this is sparta".into();
-		let crypto = Crypto::with_plain(&original_data, &passwd, 10240).unwrap();
+		let crypto = Crypto::with_plain(&original_data, &passwd, *ITERATIONS).unwrap();
 		let decrypted_data = crypto.decrypt(&passwd).unwrap();
 		assert_eq!(&original_data, &decrypted_data);
 	}
--- a/accounts/ethstore/src/account/kdf.rs
+++ b/accounts/ethstore/src/account/kdf.rs
@@ -15,6 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use json;
+use std::num::NonZeroU32;

 #[derive(Debug, PartialEq, Clone)]
 pub enum Prf {
@@ -23,7 +24,7 @@ pub enum Prf {

 #[derive(Debug, PartialEq, Clone)]
 pub struct Pbkdf2 {
-	pub c: u32,
+	pub c: NonZeroU32,
 	pub dklen: u32,
 	pub prf: Prf,
 	pub salt: Vec<u8>,
--- a/accounts/ethstore/src/account/safe_account.rs
+++ b/accounts/ethstore/src/account/safe_account.rs
@@ -20,6 +20,7 @@ use {json, Error};
 use account::Version;
 use crypto;
 use super::crypto::Crypto;
+use std::num::NonZeroU32;

 /// Account representation.
 #[derive(Debug, PartialEq, Clone)]
@@ -59,7 +60,7 @@ impl SafeAccount {
 		keypair: &KeyPair,
 		id: [u8; 16],
 		password: &Password,
-		iterations: u32,
+		iterations: NonZeroU32,
 		name: String,
 		meta: String
 	) -> Result<Self, crypto::Error> {
@@ -135,7 +136,7 @@ impl SafeAccount {
 	}

 	/// Create a new `VaultKeyFile` from the given `self`
-	pub fn into_vault_file(self, iterations: u32, password: &Password) -> Result<json::VaultKeyFile, Error> {
+	pub fn into_vault_file(self, iterations: NonZeroU32, password: &Password) -> Result<json::VaultKeyFile, Error> {
 		let meta_plain = json::VaultKeyMeta {
 			address: self.address.into(),
 			name: Some(self.name),
@@ -177,7 +178,7 @@ impl SafeAccount {
 	}

 	/// Change account's password.
-	pub fn change_password(&self, old_password: &Password, new_password: &Password, iterations: u32) -> Result<Self, Error> {
+	pub fn change_password(&self, old_password: &Password, new_password: &Password, iterations: NonZeroU32) -> Result<Self, Error> {
 		let secret = self.crypto.secret(old_password)?;
 		let result = SafeAccount {
 			id: self.id.clone(),
@@ -200,14 +201,19 @@ impl SafeAccount {
 #[cfg(test)]
 mod tests {
 	use ethkey::{Generator, Random, verify_public, Message};
-	use super::SafeAccount;
+	use super::{SafeAccount, NonZeroU32};
+
+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(10240).expect("10240 > 0; qed");
+	}
+

 	#[test]
 	fn sign_and_verify_public() {
 		let keypair = Random.generate().unwrap();
 		let password = "hello world".into();
 		let message = Message::default();
-		let account = SafeAccount::create(&keypair, [0u8; 16], &password, 10240, "Test".to_owned(), "{}".to_owned());
+		let account = SafeAccount::create(&keypair, [0u8; 16], &password, *ITERATIONS, "Test".to_owned(), "{}".to_owned());
 		let signature = account.unwrap().sign(&password, &message).unwrap();
 		assert!(verify_public(keypair.public(), &signature, &message).unwrap());
 	}
@@ -217,10 +223,9 @@ mod tests {
 		let keypair = Random.generate().unwrap();
 		let first_password = "hello world".into();
 		let sec_password = "this is sparta".into();
-		let i = 10240;
 		let message = Message::default();
-		let account = SafeAccount::create(&keypair, [0u8; 16], &first_password, i, "Test".to_owned(), "{}".to_owned()).unwrap();
-		let new_account = account.change_password(&first_password, &sec_password, i).unwrap();
+		let account = SafeAccount::create(&keypair, [0u8; 16], &first_password, *ITERATIONS, "Test".to_owned(), "{}".to_owned()).unwrap();
+		let new_account = account.change_password(&first_password, &sec_password, *ITERATIONS).unwrap();
 		assert!(account.sign(&first_password, &message).is_ok());
 		assert!(account.sign(&sec_password, &message).is_err());
 		assert!(new_account.sign(&first_password, &message).is_err());
--- a/accounts/ethstore/src/accounts_dir/disk.rs
+++ b/accounts/ethstore/src/accounts_dir/disk.rs
@@ -61,6 +61,7 @@ pub fn find_unique_filename_using_random_suffix(parent_path: &Path, original_fil
 /// Create a new file and restrict permissions to owner only. It errors if the file already exists.
 #[cfg(unix)]
 pub fn create_new_file_with_permissions_to_owner(file_path: &Path) -> io::Result<fs::File> {
+	use libc;
 	use std::os::unix::fs::OpenOptionsExt;

 	fs::OpenOptions::new()
@@ -82,6 +83,7 @@ pub fn create_new_file_with_permissions_to_owner(file_path: &Path) -> io::Result
 /// Create a new file and restrict permissions to owner only. It replaces the existing file if it already exists.
 #[cfg(unix)]
 pub fn replace_file_with_permissions_to_owner(file_path: &Path) -> io::Result<fs::File> {
+	use libc;
 	use std::os::unix::fs::PermissionsExt;

 	let file = fs::File::create(file_path)?;
@@ -354,11 +356,16 @@ mod test {
 	extern crate tempdir;

 	use std::{env, fs};
+	use std::num::NonZeroU32;
 	use super::{KeyDirectory, RootDiskDirectory, VaultKey};
 	use account::SafeAccount;
 	use ethkey::{Random, Generator};
 	use self::tempdir::TempDir;

+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(1024).expect("1024 > 0; qed");
+	}
+
 	#[test]
 	fn should_create_new_account() {
 		// given
@@ -369,7 +376,7 @@ mod test {
 		let directory = RootDiskDirectory::create(dir.clone()).unwrap();

 		// when
-		let account = SafeAccount::create(&keypair, [0u8; 16], &password, 1024, "Test".to_owned(), "{}".to_owned());
+		let account = SafeAccount::create(&keypair, [0u8; 16], &password, *ITERATIONS, "Test".to_owned(), "{}".to_owned());
 		let res = directory.insert(account.unwrap());

 		// then
@@ -390,7 +397,7 @@ mod test {
 		let directory = RootDiskDirectory::create(dir.clone()).unwrap();

 		// when
-		let account = SafeAccount::create(&keypair, [0u8; 16], &password, 1024, "Test".to_owned(), "{}".to_owned()).unwrap();
+		let account = SafeAccount::create(&keypair, [0u8; 16], &password, *ITERATIONS, "Test".to_owned(), "{}".to_owned()).unwrap();
 		let filename = "test".to_string();
 		let dedup = true;

@@ -426,7 +433,7 @@ mod test {

 		// and when
 		let before_root_items_count = fs::read_dir(&dir).unwrap().count();
-		let vault = directory.as_vault_provider().unwrap().create(vault_name, VaultKey::new(&password, 1024));
+		let vault = directory.as_vault_provider().unwrap().create(vault_name, VaultKey::new(&password, *ITERATIONS));

 		// then
 		assert!(vault.is_ok());
@@ -434,7 +441,7 @@ mod test {
 		assert!(after_root_items_count > before_root_items_count);

 		// and when
-		let vault = directory.as_vault_provider().unwrap().open(vault_name, VaultKey::new(&password, 1024));
+		let vault = directory.as_vault_provider().unwrap().open(vault_name, VaultKey::new(&password, *ITERATIONS));

 		// then
 		assert!(vault.is_ok());
@@ -451,8 +458,9 @@ mod test {
 		let temp_path = TempDir::new("").unwrap();
 		let directory = RootDiskDirectory::create(&temp_path).unwrap();
 		let vault_provider = directory.as_vault_provider().unwrap();
-		vault_provider.create("vault1", VaultKey::new(&"password1".into(), 1)).unwrap();
-		vault_provider.create("vault2", VaultKey::new(&"password2".into(), 1)).unwrap();
+		let iter = NonZeroU32::new(1).expect("1 > 0; qed");
+		vault_provider.create("vault1", VaultKey::new(&"password1".into(), iter)).unwrap();
+		vault_provider.create("vault2", VaultKey::new(&"password2".into(), iter)).unwrap();

 		// then
 		let vaults = vault_provider.list_vaults().unwrap();
@@ -474,7 +482,7 @@ mod test {

 		let keypair = Random.generate().unwrap();
 		let password = "test pass".into();
-		let account = SafeAccount::create(&keypair, [0u8; 16], &password, 1024, "Test".to_owned(), "{}".to_owned());
+		let account = SafeAccount::create(&keypair, [0u8; 16], &password, *ITERATIONS, "Test".to_owned(), "{}".to_owned());
 		directory.insert(account.unwrap()).expect("Account should be inserted ok");

 		let new_hash = directory.files_hash().expect("New files hash should be calculated ok");
--- a/accounts/ethstore/src/accounts_dir/memory.rs
+++ b/accounts/ethstore/src/accounts_dir/memory.rs
@@ -68,7 +68,7 @@ impl KeyDirectory for MemoryDirectory {
 	fn unique_repr(&self) -> Result<u64, Error> {
 		let mut val = 0u64;
 		let accounts = self.accounts.read();
-		for acc in accounts.keys() { val = val ^ acc.to_low_u64_be() }
+		for acc in accounts.keys() { val = val ^ acc.low_u64() }
 		Ok(val)
 	}
 }
--- a/accounts/ethstore/src/accounts_dir/mod.rs
+++ b/accounts/ethstore/src/accounts_dir/mod.rs
@@ -17,6 +17,7 @@
 //! Accounts Directory

 use ethkey::Password;
+use std::num::NonZeroU32;
 use std::path::{PathBuf};
 use {SafeAccount, Error};

@@ -41,7 +42,7 @@ pub struct VaultKey {
 	/// Vault password
 	pub password: Password,
 	/// Number of iterations to produce a derived key from password
-	pub iterations: u32,
+	pub iterations: NonZeroU32,
 }

 /// Keys directory
@@ -96,7 +97,7 @@ pub use self::vault::VaultDiskDirectory;

 impl VaultKey {
 	/// Create new vault key
-	pub fn new(password: &Password, iterations: u32) -> Self {
+	pub fn new(password: &Password, iterations: NonZeroU32) -> Self {
 		VaultKey {
 			password: password.clone(),
 			iterations: iterations,
--- a/accounts/ethstore/src/accounts_dir/vault.rs
+++ b/accounts/ethstore/src/accounts_dir/vault.rs
@@ -282,11 +282,17 @@ mod test {

 	use std::fs;
 	use std::io::Write;
+	use std::num::NonZeroU32;
 	use std::path::PathBuf;
 	use super::VaultKey;
 	use super::{VAULT_FILE_NAME, check_vault_name, make_vault_dir_path, create_vault_file, read_vault_file, VaultDiskDirectory};
 	use self::tempdir::TempDir;

+	
+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(1024).expect("1024 > 0; qed");
+	}
+
 	#[test]
 	fn check_vault_name_succeeds() {
 		assert!(check_vault_name("vault"));
@@ -325,7 +331,7 @@ mod test {
 	fn create_vault_file_succeeds() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password".into(), 1024);
+		let key = VaultKey::new(&"password".into(), *ITERATIONS);
 		let mut vault_dir: PathBuf = temp_path.path().into();
 		vault_dir.push("vault");
 		fs::create_dir_all(&vault_dir).unwrap();
@@ -344,7 +350,7 @@ mod test {
 	fn read_vault_file_succeeds() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password".into(), 1024);
+		let key = VaultKey::new(&"password".into(), *ITERATIONS);
 		let vault_file_contents = r#"{"crypto":{"cipher":"aes-128-ctr","cipherparams":{"iv":"758696c8dc6378ab9b25bb42790da2f5"},"ciphertext":"54eb50683717d41caaeb12ea969f2c159daada5907383f26f327606a37dc7168","kdf":"pbkdf2","kdfparams":{"c":1024,"dklen":32,"prf":"hmac-sha256","salt":"3c320fa566a1a7963ac8df68a19548d27c8f40bf92ef87c84594dcd5bbc402b6"},"mac":"9e5c2314c2a0781962db85611417c614bd6756666b6b1e93840f5b6ed895f003"}}"#;
 		let dir: PathBuf = temp_path.path().into();
 		let mut vault_file_path: PathBuf = dir.clone();
@@ -365,7 +371,7 @@ mod test {
 	fn read_vault_file_fails() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password1".into(), 1024);
+		let key = VaultKey::new(&"password1".into(), *ITERATIONS);
 		let dir: PathBuf = temp_path.path().into();
 		let mut vault_file_path: PathBuf = dir.clone();
 		vault_file_path.push(VAULT_FILE_NAME);
@@ -394,7 +400,7 @@ mod test {
 	fn vault_directory_can_be_created() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password".into(), 1024);
+		let key = VaultKey::new(&"password".into(), *ITERATIONS);
 		let dir: PathBuf = temp_path.path().into();

 		// when
@@ -414,7 +420,7 @@ mod test {
 	fn vault_directory_cannot_be_created_if_already_exists() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password".into(), 1024);
+		let key = VaultKey::new(&"password".into(), *ITERATIONS);
 		let dir: PathBuf = temp_path.path().into();
 		let mut vault_dir = dir.clone();
 		vault_dir.push("vault");
@@ -431,7 +437,7 @@ mod test {
 	fn vault_directory_cannot_be_opened_if_not_exists() {
 		// given
 		let temp_path = TempDir::new("").unwrap();
-		let key = VaultKey::new(&"password".into(), 1024);
+		let key = VaultKey::new(&"password".into(), *ITERATIONS);
 		let dir: PathBuf = temp_path.path().into();

 		// when
--- a/accounts/ethstore/src/ethstore.rs
+++ b/accounts/ethstore/src/ethstore.rs
@@ -15,12 +15,12 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use std::collections::{BTreeMap, HashMap};
+use std::num::NonZeroU32;
 use std::mem;
 use std::path::PathBuf;
 use parking_lot::{Mutex, RwLock};
 use std::time::{Instant, Duration};

-use crypto::KEY_ITERATIONS;
 use random::Random;
 use ethkey::{self, Signature, Password, Address, Message, Secret, Public, KeyPair, ExtendedKeyPair};
 use accounts_dir::{KeyDirectory, VaultKeyDirectory, VaultKey, SetKeyError};
@@ -29,6 +29,12 @@ use presale::PresaleWallet;
 use json::{self, Uuid, OpaqueKeyFile};
 use {import, Error, SimpleSecretStore, SecretStore, SecretVaultRef, StoreAccountRef, Derivation, OpaqueSecret};

+
+lazy_static! {
+	static ref KEY_ITERATIONS: NonZeroU32 =
+		NonZeroU32::new(crypto::KEY_ITERATIONS as u32).expect("KEY_ITERATIONS > 0; qed");
+}
+
 /// Accounts store.
 pub struct EthStore {
 	store: EthMultiStore,
@@ -37,11 +43,11 @@ pub struct EthStore {
 impl EthStore {
 	/// Open a new accounts store with given key directory backend.
 	pub fn open(directory: Box<KeyDirectory>) -> Result<Self, Error> {
-		Self::open_with_iterations(directory, KEY_ITERATIONS as u32)
+		Self::open_with_iterations(directory, *KEY_ITERATIONS)
 	}

 	/// Open a new account store with given key directory backend and custom number of iterations.
-	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: u32) -> Result<Self, Error> {
+	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: NonZeroU32) -> Result<Self, Error> {
 		Ok(EthStore {
 			store: EthMultiStore::open_with_iterations(directory, iterations)?,
 		})
@@ -257,7 +263,7 @@ impl SecretStore for EthStore {
 /// Similar to `EthStore` but may store many accounts (with different passwords) for the same `Address`
 pub struct EthMultiStore {
 	dir: Box<KeyDirectory>,
-	iterations: u32,
+	iterations: NonZeroU32,
 	// order lock: cache, then vaults
 	cache: RwLock<BTreeMap<StoreAccountRef, Vec<SafeAccount>>>,
 	vaults: Mutex<HashMap<String, Box<VaultKeyDirectory>>>,
@@ -273,11 +279,11 @@ struct Timestamp {
 impl EthMultiStore {
 	/// Open new multi-accounts store with given key directory backend.
 	pub fn open(directory: Box<KeyDirectory>) -> Result<Self, Error> {
-		Self::open_with_iterations(directory, KEY_ITERATIONS as u32)
+		Self::open_with_iterations(directory, *KEY_ITERATIONS)
 	}

 	/// Open new multi-accounts store with given key directory backend and custom number of iterations for new keys.
-	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: u32) -> Result<Self, Error> {
+	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: NonZeroU32) -> Result<Self, Error> {
 		let store = EthMultiStore {
 			dir: directory,
 			vaults: Mutex::new(HashMap::new()),
@@ -1084,7 +1090,7 @@ mod tests {
 			SecretVaultRef::Root,
 			&address,
 			&"test".into(),
-			Derivation::HardHash(H256::zero()),
+			Derivation::HardHash(H256::from(0)),
 		).unwrap();

 		// there should be 2 accounts in the store
--- a/accounts/ethstore/src/json/crypto.rs
+++ b/accounts/ethstore/src/json/crypto.rs
@@ -41,7 +41,7 @@ impl str::FromStr for Crypto {

 impl From<Crypto> for String {
 	fn from(c: Crypto) -> Self {
-		serde_json::to_string(&c).expect("Serialization cannot fail, because all crypto keys are strings")
+		serde_json::to_string(&c).expect("serialization cannot fail, cause all crypto keys are strings")
 	}
 }

--- a/accounts/ethstore/src/json/kdf.rs
+++ b/accounts/ethstore/src/json/kdf.rs
@@ -15,6 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use std::fmt;
+use std::num::NonZeroU32;
 use serde::{Serialize, Serializer, Deserialize, Deserializer};
 use serde::de::{Visitor, Error as SerdeError};
 use super::{Error, Bytes};
@@ -108,7 +109,7 @@ impl<'a> Visitor<'a> for PrfVisitor {

 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 pub struct Pbkdf2 {
-	pub c: u32,
+	pub c: NonZeroU32,
 	pub dklen: u32,
 	pub prf: Prf,
 	pub salt: Bytes,
--- a/accounts/ethstore/src/json/vault_file.rs
+++ b/accounts/ethstore/src/json/vault_file.rs
@@ -41,6 +41,11 @@ impl VaultFile {
 mod test {
 	use serde_json;
 	use json::{VaultFile, Crypto, Cipher, Aes128Ctr, Kdf, Pbkdf2, Prf};
+	use std::num::NonZeroU32;
+
+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(1024).expect("1024 > 0; qed");
+	}

 	#[test]
 	fn to_and_from_json() {
@@ -51,7 +56,7 @@ mod test {
 				}),
 				ciphertext: "4d6938a1f49b7782".into(),
 				kdf: Kdf::Pbkdf2(Pbkdf2 {
-					c: 1024,
+					c: *ITERATIONS,
 					dklen: 32,
 					prf: Prf::HmacSha256,
 					salt: "b6a9338a7ccd39288a86dba73bfecd9101b4f3db9c9830e7c76afdbd4f6872e5".into(),
@@ -76,7 +81,7 @@ mod test {
 				}),
 				ciphertext: "4d6938a1f49b7782".into(),
 				kdf: Kdf::Pbkdf2(Pbkdf2 {
-					c: 1024,
+					c: *ITERATIONS,
 					dklen: 32,
 					prf: Prf::HmacSha256,
 					salt: "b6a9338a7ccd39288a86dba73bfecd9101b4f3db9c9830e7c76afdbd4f6872e5".into(),
--- a/accounts/ethstore/src/json/vault_key_file.rs
+++ b/accounts/ethstore/src/json/vault_key_file.rs
@@ -106,6 +106,11 @@ mod test {
 	use serde_json;
 	use json::{VaultKeyFile, Version, Crypto, Cipher, Aes128Ctr, Kdf, Pbkdf2, Prf,
 		insert_vault_name_to_json_meta, remove_vault_name_from_json_meta};
+	use std::num::NonZeroU32;
+
+	lazy_static! {
+		static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(10240).expect("10240 > 0; qed");
+	}

 	#[test]
 	fn to_and_from_json() {
@@ -118,7 +123,7 @@ mod test {
 				}),
 				ciphertext: "4befe0a66d9a4b6fec8e39eb5c90ac5dafdeaab005fff1af665fd1f9af925c91".into(),
 				kdf: Kdf::Pbkdf2(Pbkdf2 {
-					c: 10240,
+					c: *ITERATIONS,
 					dklen: 32,
 					prf: Prf::HmacSha256,
 					salt: "f17731e84ecac390546692dbd4ccf6a3a2720dc9652984978381e61c28a471b2".into(),
@@ -131,7 +136,7 @@ mod test {
 				}),
 				ciphertext: "fef0d113d7576c1702daf380ad6f4c5408389e57991cae2a174facd74bd549338e1014850bddbab7eb486ff5f5c9c5532800c6a6d4db2be2212cd5cd3769244ab230e1f369e8382a9e6d7c0a".into(),
 				kdf: Kdf::Pbkdf2(Pbkdf2 {
-					c: 10240,
+					c: *ITERATIONS,
 					dklen: 32,
 					prf: Prf::HmacSha256,
 					salt: "aca82865174a82249a198814b263f43a631f272cbf7ed329d0f0839d259c652a".into(),
--- a/accounts/ethstore/src/lib.rs
+++ b/accounts/ethstore/src/lib.rs
@@ -36,6 +36,8 @@ extern crate ethereum_types;
 extern crate ethkey as _ethkey;
 extern crate parity_wordlist;

+#[macro_use]
+extern crate lazy_static;
 #[macro_use]
 extern crate log;
 #[macro_use]
--- a/accounts/ethstore/src/presale.rs
+++ b/accounts/ethstore/src/presale.rs
@@ -15,6 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use std::fs;
+use std::num::NonZeroU32;
 use std::path::Path;
 use json;
 use ethkey::{Address, Secret, KeyPair, Password};
@@ -58,7 +59,8 @@ impl PresaleWallet {
 		let mut derived_key = [0u8; 32];
 		let salt = pbkdf2::Salt(password.as_bytes());
 		let sec = pbkdf2::Secret(password.as_bytes());
-		pbkdf2::sha256(2000, salt, sec, &mut derived_key);
+		let iter = NonZeroU32::new(2000).expect("2000 > 0; qed");
+		pbkdf2::sha256(iter, salt, sec, &mut derived_key);

 		let mut key = vec![0; self.ciphertext.len()];
 		let len = crypto::aes::decrypt_128_cbc(&derived_key[0..16], &self.iv, &self.ciphertext, &mut key)
--- a/accounts/ethstore/src/random.rs
+++ b/accounts/ethstore/src/random.rs
@@ -14,7 +14,7 @@
 // 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 rand::{Rng, RngCore, rngs::OsRng, distributions::Alphanumeric};
+use rand::{Rng, OsRng};

 pub trait Random {
 	fn random() -> Self where Self: Sized;
@@ -41,5 +41,5 @@ impl Random for [u8; 32] {
 /// Generate a random string of given length.
 pub fn random_string(length: usize) -> String {
 	let mut rng = OsRng::new().expect("Not able to operate without random source.");
-	rng.sample_iter(&Alphanumeric).take(length).collect()
+	rng.gen_ascii_chars().take(length).collect()
 }
--- a/accounts/ethstore/tests/api.rs
+++ b/accounts/ethstore/tests/api.rs
@@ -16,7 +16,6 @@

 extern crate rand;
 extern crate ethstore;
-extern crate ethereum_types;

 mod util;

@@ -24,8 +23,6 @@ use ethstore::{EthStore, SimpleSecretStore, SecretVaultRef, StoreAccountRef};
 use ethstore::ethkey::{Random, Generator, Secret, KeyPair, verify_address};
 use ethstore::accounts_dir::RootDiskDirectory;
 use util::TransientDir;
-use ethereum_types::Address;
-use std::str::FromStr;

 #[test]
 fn secret_store_create() {
@@ -117,9 +114,9 @@ fn secret_store_laod_geth_files() {
 	let dir = RootDiskDirectory::at(test_path());
 	let store = EthStore::open(Box::new(dir)).unwrap();
 	assert_eq!(store.accounts().unwrap(), vec![
-		StoreAccountRef::root(Address::from_str("3f49624084b67849c7b4e805c5988c21a430f9d9").unwrap()),
-		StoreAccountRef::root(Address::from_str("5ba4dcf897e97c2bdf8315b9ef26c13c085988cf").unwrap()),
-		StoreAccountRef::root(Address::from_str("63121b431a52f8043c16fcf0d1df9cb7b5f66649").unwrap()),
+		StoreAccountRef::root("3f49624084b67849c7b4e805c5988c21a430f9d9".into()),
+		StoreAccountRef::root("5ba4dcf897e97c2bdf8315b9ef26c13c085988cf".into()),
+		StoreAccountRef::root("63121b431a52f8043c16fcf0d1df9cb7b5f66649".into()),
 	]);
 }

@@ -128,8 +125,8 @@ fn secret_store_load_pat_files() {
 	let dir = RootDiskDirectory::at(pat_path());
 	let store = EthStore::open(Box::new(dir)).unwrap();
 	assert_eq!(store.accounts().unwrap(), vec![
-		StoreAccountRef::root(Address::from_str("3f49624084b67849c7b4e805c5988c21a430f9d9").unwrap()),
-		StoreAccountRef::root(Address::from_str("5ba4dcf897e97c2bdf8315b9ef26c13c085988cf").unwrap()),
+		StoreAccountRef::root("3f49624084b67849c7b4e805c5988c21a430f9d9".into()),
+		StoreAccountRef::root("5ba4dcf897e97c2bdf8315b9ef26c13c085988cf".into()),
 	]);
 }

@@ -143,8 +140,8 @@ fn test_decrypting_files_with_short_ciphertext() {
 	let store = EthStore::open(Box::new(dir)).unwrap();
 	let accounts = store.accounts().unwrap();
 	assert_eq!(accounts, vec![
-		StoreAccountRef::root(Address::from_str("31e9d1e6d844bd3a536800ef8d8be6a9975db509").unwrap()),
-		StoreAccountRef::root(Address::from_str("d1e64e5480bfaf733ba7d48712decb8227797a4e").unwrap()),
+		StoreAccountRef::root("31e9d1e6d844bd3a536800ef8d8be6a9975db509".into()),
+		StoreAccountRef::root("d1e64e5480bfaf733ba7d48712decb8227797a4e".into()),
 	]);

 	let message = Default::default();
--- a/accounts/ethstore/tests/util/transient_dir.rs
+++ b/accounts/ethstore/tests/util/transient_dir.rs
@@ -16,7 +16,7 @@

 use std::path::PathBuf;
 use std::{env, fs};
-use rand::{RngCore, rngs::OsRng};
+use rand::{Rng, OsRng};
 use ethstore::accounts_dir::{KeyDirectory, RootDiskDirectory};
 use ethstore::{Error, SafeAccount};

--- a/accounts/fake-hardware-wallet/Cargo.toml
+++ b/accounts/fake-hardware-wallet/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+description = "Fake hardware-wallet, for OS' that don't support libusb"
+name = "fake-hardware-wallet"
+version = "0.0.1"
+license = "GPL-3.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+ethereum-types = "0.4"
+ethkey = { path = "../../accounts/ethkey" }
--- a/accounts/fake-hardware-wallet/src/lib.rs
+++ b/accounts/fake-hardware-wallet/src/lib.rs
@@ -0,0 +1,101 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity Ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Dummy module for platforms that does not provide support for hardware wallets (libusb)
+
+extern crate ethereum_types;
+extern crate ethkey;
+
+use std::fmt;
+use ethereum_types::U256;
+use ethkey::{Address, Signature};
+
+pub struct WalletInfo {
+	pub address: Address,
+	pub name: String,
+	pub manufacturer: String,
+}
+
+#[derive(Debug)]
+/// `ErrorType` for devices with no `hardware wallet`
+pub enum Error {
+	NoWallet,
+	KeyNotFound,
+}
+
+pub struct TransactionInfo {
+	/// Nonce
+	pub nonce: U256,
+	/// Gas price
+	pub gas_price: U256,
+	/// Gas limit
+	pub gas_limit: U256,
+	/// Receiver
+	pub to: Option<Address>,
+	/// Value
+	pub value: U256,
+	/// Data
+	pub data: Vec<u8>,
+	/// Chain ID
+	pub chain_id: Option<u64>,
+}
+
+pub enum KeyPath {
+	/// Ethereum.
+	Ethereum,
+	/// Ethereum classic.
+	EthereumClassic,
+}
+
+/// `HardwareWalletManager` for devices with no `hardware wallet`
+pub struct HardwareWalletManager;
+
+impl HardwareWalletManager {
+	pub fn new() -> Result<Self, Error> {
+		Err(Error::NoWallet)
+	}
+
+	pub fn set_key_path(&self, _key_path: KeyPath) {}
+
+	pub fn wallet_info(&self, _: &Address) -> Option<WalletInfo> { 
+		None 
+	}
+
+	pub fn list_wallets(&self) -> Vec<WalletInfo> {
+		Vec::with_capacity(0)
+	}
+
+	pub fn list_locked_wallets(&self) -> Result<Vec<String>, Error> {
+		Err(Error::NoWallet)
+	}
+
+	pub fn pin_matrix_ack(&self, _: &str, _: &str) -> Result<bool, Error> { 
+		Err(Error::NoWallet)
+	}
+	
+	pub fn sign_transaction(&self, _address: &Address, _transaction: &TransactionInfo, _rlp_transaction: &[u8]) -> Result<Signature, Error> { 
+		Err(Error::NoWallet) }
+	
+	pub fn sign_message(&self, _address: &Address, _msg: &[u8]) -> Result<Signature, Error> {
+		Err(Error::NoWallet)
+	}
+}
+
+impl fmt::Display for Error {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { 
+		write!(f, "No hardware wallet!!") 
+	}
+}
--- a/accounts/hw/Cargo.toml
+++ b/accounts/hw/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+description = "Hardware wallet support."
+homepage = "http://parity.io"
+license = "GPL-3.0"
+name = "hardware-wallet"
+version = "1.12.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+log = "0.4"
+parking_lot = "0.7"
+protobuf = "1.4"
+hidapi = { git = "https://github.com/paritytech/hidapi-rs" }
+libusb = { git = "https://github.com/paritytech/libusb-rs" }
+trezor-sys = { git = "https://github.com/paritytech/trezor-sys" }
+ethkey = { path = "../ethkey" }
+ethereum-types = "0.4"
+semver = "0.9"
+
+[dev-dependencies]
+rustc-hex = "1.0"
--- a/accounts/hw/src/ledger.rs
+++ b/accounts/hw/src/ledger.rs
--- a/accounts/hw/src/lib.rs
+++ b/accounts/hw/src/lib.rs
@@ -0,0 +1,402 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity Ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Hardware wallet management.
+
+#![warn(missing_docs)]
+#![warn(warnings)]
+
+extern crate ethereum_types;
+extern crate ethkey;
+extern crate hidapi;
+extern crate libusb;
+extern crate parking_lot;
+extern crate protobuf;
+extern crate semver;
+extern crate trezor_sys;
+
+#[macro_use] extern crate log;
+#[cfg(test)] extern crate rustc_hex;
+
+mod ledger;
+mod trezor;
+
+use std::sync::{Arc, atomic, atomic::AtomicBool, Weak};
+use std::{fmt, time::Duration};
+use std::thread;
+
+use ethereum_types::U256;
+use ethkey::{Address, Signature};
+use parking_lot::Mutex;
+
+const HID_GLOBAL_USAGE_PAGE: u16 = 0xFF00;
+const HID_USB_DEVICE_CLASS: u8 = 0;
+const MAX_POLLING_DURATION: Duration = Duration::from_millis(500);
+const USB_EVENT_POLLING_INTERVAL: Duration = Duration::from_millis(500);
+
+/// `HardwareWallet` device
+#[derive(Debug)]
+pub struct Device {
+	path: String,
+	info: WalletInfo,
+}
+
+/// `Wallet` trait
+pub trait Wallet<'a> {
+	/// Error
+	type Error;
+	/// Transaction data format
+	type Transaction;
+
+	/// Sign transaction data with wallet managing `address`.
+	fn sign_transaction(&self, address: &Address, transaction: Self::Transaction) -> Result<Signature, Self::Error>;
+
+	/// Set key derivation path for a chain.
+	fn set_key_path(&self, key_path: KeyPath);
+
+	/// Re-populate device list
+	/// Note, this assumes all devices are iterated over and updated
+	fn update_devices(&self, device_direction: DeviceDirection) -> Result<usize, Self::Error>;
+
+	/// Read device info
+	fn read_device(&self, usb: &hidapi::HidApi, dev_info: &hidapi::HidDeviceInfo) -> Result<Device, Self::Error>;
+
+	/// List connected and acknowledged wallets
+	fn list_devices(&self) -> Vec<WalletInfo>;
+
+	/// List locked wallets
+	/// This may be moved if it is the wrong assumption, for example this is not supported by Ledger
+	/// Then this method return a empty vector
+	fn list_locked_devices(&self) -> Vec<String>;
+
+	/// Get wallet info.
+	fn get_wallet(&self, address: &Address) -> Option<WalletInfo>;
+
+	/// Generate ethereum address for a Wallet
+	fn get_address(&self, device: &hidapi::HidDevice) -> Result<Option<Address>, Self::Error>;
+
+	/// Open a device using `device path`
+	/// Note, f - is a closure that borrows HidResult<HidDevice>
+	/// HidDevice is in turn a type alias for a `c_void function pointer`
+	/// For further information see:
+	///		* <https://github.com/paritytech/hidapi-rs>
+	///		* <https://github.com/rust-lang/libc>
+	fn open_path<R, F>(&self, f: F) -> Result<R, Self::Error>
+		where F: Fn() -> Result<R, &'static str>;
+}
+
+/// Hardware wallet error.
+#[derive(Debug)]
+pub enum Error {
+	/// Ledger device error.
+	LedgerDevice(ledger::Error),
+	/// Trezor device error
+	TrezorDevice(trezor::Error),
+	/// USB error.
+	Usb(libusb::Error),
+	/// HID error
+	Hid(String),
+	/// Hardware wallet not found for specified key.
+	KeyNotFound,
+}
+
+/// This is the transaction info we need to supply to Trezor message. It's more
+/// or less a duplicate of `ethcore::transaction::Transaction`, but we can't
+/// import ethcore here as that would be a circular dependency.
+pub struct TransactionInfo {
+	/// Nonce
+	pub nonce: U256,
+	/// Gas price
+	pub gas_price: U256,
+	/// Gas limit
+	pub gas_limit: U256,
+	/// Receiver
+	pub to: Option<Address>,
+	/// Value
+	pub value: U256,
+	/// Data
+	pub data: Vec<u8>,
+	/// Chain ID
+	pub chain_id: Option<u64>,
+}
+
+/// Hardware wallet information.
+#[derive(Debug, Clone)]
+pub struct WalletInfo {
+	/// Wallet device name.
+	pub name: String,
+	/// Wallet device manufacturer.
+	pub manufacturer: String,
+	/// Wallet device serial number.
+	pub serial: String,
+	/// Ethereum address.
+	pub address: Address,
+}
+
+/// Key derivation paths used on hardware wallets.
+#[derive(Debug, Clone, Copy)]
+pub enum KeyPath {
+	/// Ethereum.
+	Ethereum,
+	/// Ethereum classic.
+	EthereumClassic,
+}
+
+impl fmt::Display for Error {
+	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+		match *self {
+			Error::KeyNotFound => write!(f, "Key not found for given address."),
+			Error::LedgerDevice(ref e) => write!(f, "{}", e),
+			Error::TrezorDevice(ref e) => write!(f, "{}", e),
+			Error::Usb(ref e) => write!(f, "{}", e),
+			Error::Hid(ref e) => write!(f, "{}", e),
+		}
+	}
+}
+
+impl From<ledger::Error> for Error {
+	fn from(err: ledger::Error) -> Self {
+		match err {
+			ledger::Error::KeyNotFound => Error::KeyNotFound,
+			_ => Error::LedgerDevice(err),
+		}
+	}
+}
+
+impl From<trezor::Error> for Error {
+	fn from(err: trezor::Error) -> Self {
+		match err {
+			trezor::Error::KeyNotFound => Error::KeyNotFound,
+			_ => Error::TrezorDevice(err),
+		}
+	}
+}
+
+impl From<libusb::Error> for Error {
+	fn from(err: libusb::Error) -> Self {
+		Error::Usb(err)
+	}
+}
+
+/// Specifies the direction of the `HardwareWallet` i.e, whether it arrived or left
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum DeviceDirection {
+	/// Device arrived
+	Arrived,
+	/// Device left
+	Left,
+}
+
+impl fmt::Display for DeviceDirection {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		match self {
+			DeviceDirection::Arrived => write!(f, "arrived"),
+			DeviceDirection::Left => write!(f, "left"),
+		}
+	}
+}
+
+/// Hardware wallet management interface.
+pub struct HardwareWalletManager {
+	exiting: Arc<AtomicBool>,
+	ledger: Arc<ledger::Manager>,
+	trezor: Arc<trezor::Manager>,
+}
+
+impl HardwareWalletManager {
+	/// Hardware wallet constructor
+	pub fn new() -> Result<Self, Error> {
+		let exiting = Arc::new(AtomicBool::new(false));
+		let hidapi = Arc::new(Mutex::new(hidapi::HidApi::new().map_err(|e| Error::Hid(e.to_string().clone()))?));
+		let ledger = ledger::Manager::new(hidapi.clone());
+		let trezor = trezor::Manager::new(hidapi.clone());
+		let usb_context = Arc::new(libusb::Context::new()?);
+
+		let l = ledger.clone();
+		let t = trezor.clone();
+		let exit = exiting.clone();
+
+		// Subscribe to all vendor IDs (VIDs) and product IDs (PIDs)
+		// This means that the `HardwareWalletManager` is responsible to validate the detected device
+		usb_context.register_callback(
+			None, None, Some(HID_USB_DEVICE_CLASS),
+			Box::new(EventHandler::new(
+				Arc::downgrade(&ledger),
+				Arc::downgrade(&trezor)
+			))
+		)?;
+
+		// Hardware event subscriber thread
+		thread::Builder::new()
+			.name("hw_wallet_manager".to_string())
+			.spawn(move || {
+				if let Err(e) = l.update_devices(DeviceDirection::Arrived) {
+					debug!(target: "hw", "Ledger couldn't connect at startup, error: {}", e);
+				}
+				if let Err(e) = t.update_devices(DeviceDirection::Arrived) {
+					debug!(target: "hw", "Trezor couldn't connect at startup, error: {}", e);
+				}
+
+				while !exit.load(atomic::Ordering::Acquire) {
+					if let Err(e) = usb_context.handle_events(Some(USB_EVENT_POLLING_INTERVAL)) {
+						debug!(target: "hw", "HardwareWalletManager event handler error: {}", e);
+					}
+				}
+			})
+			.ok();
+
+		Ok(Self {
+			exiting,
+			trezor,
+			ledger,
+		})
+	}
+
+	/// Select key derivation path for a chain.
+	/// Currently, only one hard-coded keypath is supported
+	/// It is managed by `ethcore/account_provider`
+	pub fn set_key_path(&self, key_path: KeyPath) {
+		self.ledger.set_key_path(key_path);
+		self.trezor.set_key_path(key_path);
+	}
+
+	/// List connected wallets. This only returns wallets that are ready to be used.
+	pub fn list_wallets(&self) -> Vec<WalletInfo> {
+		let mut wallets = Vec::new();
+		wallets.extend(self.ledger.list_devices());
+		wallets.extend(self.trezor.list_devices());
+		wallets
+	}
+
+	/// Return a list of paths to locked hardware wallets
+	/// This is only applicable to Trezor because Ledger only appears as
+	/// a device when it is unlocked
+	pub fn list_locked_wallets(&self) -> Result<Vec<String>, Error> {
+		Ok(self.trezor.list_locked_devices())
+	}
+
+	/// Get connected wallet info.
+	pub fn wallet_info(&self, address: &Address) -> Option<WalletInfo> {
+		if let Some(info) = self.ledger.get_wallet(address) {
+			Some(info)
+		} else {
+			self.trezor.get_wallet(address)
+		}
+	}
+
+	/// Sign a message with the wallet (only supported by Ledger)
+	pub fn sign_message(&self, address: &Address, msg: &[u8]) -> Result<Signature, Error> {
+		if self.ledger.get_wallet(address).is_some() {
+			Ok(self.ledger.sign_message(address, msg)?)
+		} else if self.trezor.get_wallet(address).is_some() {
+			Err(Error::TrezorDevice(trezor::Error::NoSigningMessage))
+		} else {
+			Err(Error::KeyNotFound)
+		}
+	}
+
+	/// Sign transaction data with wallet managing `address`.
+	pub fn sign_transaction(&self, address: &Address, t_info: &TransactionInfo, encoded_transaction: &[u8]) -> Result<Signature, Error> {
+		if self.ledger.get_wallet(address).is_some() {
+			Ok(self.ledger.sign_transaction(address, encoded_transaction)?)
+		} else if self.trezor.get_wallet(address).is_some() {
+			Ok(self.trezor.sign_transaction(address, t_info)?)
+		} else {
+			Err(Error::KeyNotFound)
+		}
+	}
+
+	/// Send a pin to a device at a certain path to unlock it
+	/// This is only applicable to Trezor because Ledger only appears as
+	/// a device when it is unlocked
+	pub fn pin_matrix_ack(&self, path: &str, pin: &str) -> Result<bool, Error> {
+		self.trezor.pin_matrix_ack(path, pin).map_err(Error::TrezorDevice)
+	}
+}
+
+impl Drop for HardwareWalletManager {
+	fn drop(&mut self) {
+		// Indicate to the USB Hotplug handler that it
+		// shall terminate but don't wait for it to terminate.
+		// If it doesn't terminate for some reason USB Hotplug events will be handled
+		// even if the HardwareWalletManger has been dropped
+		self.exiting.store(true, atomic::Ordering::Release);
+	}
+}
+
+/// Hardware wallet event handler
+///
+/// Note, that this runs to completion and race-conditions can't occur but it can
+/// stop other events for being processed with an infinite loop or similar
+struct EventHandler {
+	ledger: Weak<ledger::Manager>,
+	trezor: Weak<trezor::Manager>,
+}
+
+impl EventHandler {
+	/// Trezor event handler constructor
+	pub fn new(ledger: Weak<ledger::Manager>, trezor: Weak<trezor::Manager>) -> Self {
+		Self { ledger, trezor }
+	}
+
+	fn extract_device_info(device: &libusb::Device) -> Result<(u16, u16), Error> {
+		let desc = device.device_descriptor()?;
+		Ok((desc.vendor_id(), desc.product_id()))
+	}
+}
+
+impl libusb::Hotplug for EventHandler {
+	fn device_arrived(&mut self, device: libusb::Device) {
+		// Upgrade reference to an Arc
+		if let (Some(ledger), Some(trezor)) = (self.ledger.upgrade(), self.trezor.upgrade()) {
+			// Version ID and Product ID are available
+			if let Ok((vid, pid)) = Self::extract_device_info(&device) {
+				if trezor::is_valid_trezor(vid, pid) {
+					if !trezor::try_connect_polling(&trezor, &MAX_POLLING_DURATION, DeviceDirection::Arrived) {
+						trace!(target: "hw", "Trezor device was detected but connection failed");
+					}
+				} else if ledger::is_valid_ledger(vid, pid) {
+					if !ledger::try_connect_polling(&ledger, &MAX_POLLING_DURATION, DeviceDirection::Arrived) {
+						trace!(target: "hw", "Ledger device was detected but connection failed");
+					}
+				}
+			}
+		}
+	}
+
+	fn device_left(&mut self, device: libusb::Device) {
+		// Upgrade reference to an Arc
+		if let (Some(ledger), Some(trezor)) = (self.ledger.upgrade(), self.trezor.upgrade()) {
+			// Version ID and Product ID are available
+			if let Ok((vid, pid)) = Self::extract_device_info(&device) {
+				if trezor::is_valid_trezor(vid, pid) {
+					if !trezor::try_connect_polling(&trezor, &MAX_POLLING_DURATION, DeviceDirection::Left) {
+						trace!(target: "hw", "Trezor device was detected but disconnection failed");
+					}
+				} else if ledger::is_valid_ledger(vid, pid) {
+					if !ledger::try_connect_polling(&ledger, &MAX_POLLING_DURATION, DeviceDirection::Left) {
+						trace!(target: "hw", "Ledger device was detected but disconnection failed");
+					}
+				}
+			}
+		}
+	}
+}
+
+/// Helper to determine if a device is a valid HID
+pub fn is_valid_hid_device(usage_page: u16, interface_number: i32) -> bool {
+	usage_page == HID_GLOBAL_USAGE_PAGE || interface_number == HID_USB_DEVICE_CLASS as i32
+}
--- a/accounts/hw/src/trezor.rs
+++ b/accounts/hw/src/trezor.rs
@@ -0,0 +1,463 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity Ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Trezor hardware wallet module. Supports Trezor v1.
+//! See <http://doc.satoshilabs.com/trezor-tech/api-protobuf.html>
+//! and <https://github.com/trezor/trezor-common/blob/master/protob/protocol.md>
+//! for protocol details.
+
+use std::cmp::{min, max};
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+use std::fmt;
+
+use ethereum_types::{U256, H256, Address};
+use ethkey::Signature;
+use hidapi;
+use libusb;
+use parking_lot::{Mutex, RwLock};
+use protobuf::{self, Message, ProtobufEnum};
+use super::{DeviceDirection, WalletInfo, TransactionInfo, KeyPath, Wallet, Device, is_valid_hid_device};
+use trezor_sys::messages::{EthereumAddress, PinMatrixAck, MessageType, EthereumTxRequest, EthereumSignTx, EthereumGetAddress, EthereumTxAck, ButtonAck};
+
+/// Trezor v1 vendor ID
+const TREZOR_VID: u16 = 0x534c;
+/// Trezor product IDs
+const TREZOR_PIDS: [u16; 1] = [0x0001];
+
+const ETH_DERIVATION_PATH: [u32; 5] = [0x8000_002C, 0x8000_003C, 0x8000_0000, 0, 0]; // m/44'/60'/0'/0/0
+const ETC_DERIVATION_PATH: [u32; 5] = [0x8000_002C, 0x8000_003D, 0x8000_0000, 0, 0]; // m/44'/61'/0'/0/0
+
+/// Hardware wallet error.
+#[derive(Debug)]
+pub enum Error {
+	/// Ethereum wallet protocol error.
+	Protocol(&'static str),
+	/// Hidapi error.
+	Usb(hidapi::HidError),
+	/// Libusb error
+	LibUsb(libusb::Error),
+	/// Device with request key is not available.
+	KeyNotFound,
+	/// Signing has been cancelled by user.
+	UserCancel,
+	/// The Message Type given in the trezor RPC call is not something we recognize
+	BadMessageType,
+	/// Trying to read from a closed device at the given path
+	LockedDevice(String),
+	/// Signing messages are not supported by Trezor
+	NoSigningMessage,
+	/// No device arrived
+	NoDeviceArrived,
+	/// No device left
+	NoDeviceLeft,
+	/// Invalid PID or VID
+	InvalidDevice,
+}
+
+impl fmt::Display for Error {
+	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+		match *self {
+			Error::Protocol(ref s) => write!(f, "Trezor protocol error: {}", s),
+			Error::Usb(ref e) => write!(f, "USB communication error: {}", e),
+			Error::LibUsb(ref e) => write!(f, "LibUSB communication error: {}", e),
+			Error::KeyNotFound => write!(f, "Key not found"),
+			Error::UserCancel => write!(f, "Operation has been cancelled"),
+			Error::BadMessageType => write!(f, "Bad Message Type in RPC call"),
+			Error::LockedDevice(ref s) => write!(f, "Device is locked, needs PIN to perform operations: {}", s),
+			Error::NoSigningMessage=> write!(f, "Signing messages are not supported by Trezor"),
+			Error::NoDeviceArrived => write!(f, "No device arrived"),
+			Error::NoDeviceLeft => write!(f, "No device left"),
+			Error::InvalidDevice => write!(f, "Device with non-supported product ID or vendor ID was detected"),
+		}
+	}
+}
+
+impl From<hidapi::HidError> for Error {
+	fn from(err: hidapi::HidError) -> Self {
+		Error::Usb(err)
+	}
+}
+
+impl From<libusb::Error> for Error {
+	fn from(err: libusb::Error) -> Self {
+		Error::LibUsb(err)
+	}
+}
+
+impl From<protobuf::ProtobufError> for Error {
+	fn from(_: protobuf::ProtobufError) -> Self {
+		Error::Protocol(&"Could not read response from Trezor Device")
+	}
+}
+
+/// Trezor device manager
+pub struct Manager {
+	usb: Arc<Mutex<hidapi::HidApi>>,
+	devices: RwLock<Vec<Device>>,
+	locked_devices: RwLock<Vec<String>>,
+	key_path: RwLock<KeyPath>,
+}
+
+/// HID Version used for the Trezor device
+enum HidVersion {
+	V1,
+	V2,
+}
+
+impl Manager {
+	/// Create a new instance.
+	pub fn new(usb: Arc<Mutex<hidapi::HidApi>>) -> Arc<Self> {
+		Arc::new(Self {
+			usb,
+			devices: RwLock::new(Vec::new()),
+			locked_devices: RwLock::new(Vec::new()),
+			key_path: RwLock::new(KeyPath::Ethereum),
+		})
+	}
+
+	pub fn pin_matrix_ack(&self, device_path: &str, pin: &str) -> Result<bool, Error> {
+		let unlocked = {
+			let usb = self.usb.lock();
+			let device = self.open_path(|| usb.open_path(&device_path))?;
+			let t = MessageType::MessageType_PinMatrixAck;
+			let mut m = PinMatrixAck::new();
+			m.set_pin(pin.to_string());
+			self.send_device_message(&device, t, &m)?;
+			let (resp_type, _) = self.read_device_response(&device)?;
+			match resp_type {
+				// Getting an Address back means it's unlocked, this is undocumented behavior
+				MessageType::MessageType_EthereumAddress => Ok(true),
+				// Getting anything else means we didn't unlock it
+				_ => Ok(false),
+
+			}
+		};
+		self.update_devices(DeviceDirection::Arrived)?;
+		unlocked
+	}
+
+	fn u256_to_be_vec(&self, val: &U256) -> Vec<u8> {
+		let mut buf = [0_u8; 32];
+		val.to_big_endian(&mut buf);
+		buf.iter().skip_while(|x| **x == 0).cloned().collect()
+	}
+
+	fn signing_loop(&self, handle: &hidapi::HidDevice, chain_id: &Option<u64>, data: &[u8]) -> Result<Signature, Error> {
+		let (resp_type, bytes) = self.read_device_response(&handle)?;
+		match resp_type {
+			MessageType::MessageType_Cancel => Err(Error::UserCancel),
+			MessageType::MessageType_ButtonRequest => {
+				self.send_device_message(handle, MessageType::MessageType_ButtonAck, &ButtonAck::new())?;
+				// Signing loop goes back to the top and reading blocks
+				// for up to 5 minutes waiting for response from the device
+				// if the user doesn't click any button within 5 minutes you
+				// get a signing error and the device sort of locks up on the signing screen
+				self.signing_loop(handle, chain_id, data)
+			}
+			MessageType::MessageType_EthereumTxRequest => {
+				let resp: EthereumTxRequest = protobuf::core::parse_from_bytes(&bytes)?;
+				if resp.has_data_length() {
+					let mut msg = EthereumTxAck::new();
+					let len = resp.get_data_length() as usize;
+					msg.set_data_chunk(data[..len].to_vec());
+					self.send_device_message(handle, MessageType::MessageType_EthereumTxAck, &msg)?;
+					self.signing_loop(handle, chain_id, &data[len..])
+				} else {
+					let v = resp.get_signature_v();
+					let r = H256::from_slice(resp.get_signature_r());
+					let s = H256::from_slice(resp.get_signature_s());
+					if let Some(c_id) = *chain_id {
+						// If there is a chain_id supplied, Trezor will return a v
+						// part of the signature that is already adjusted for EIP-155,
+						// so v' = v + 2 * chain_id + 35, but code further down the
+						// pipeline will already do this transformation, so remove it here
+						let adjustment = 35 + 2 * c_id as u32;
+						Ok(Signature::from_rsv(&r, &s, (max(v, adjustment) - adjustment) as u8))
+					} else {
+						// If there isn't a chain_id, v will be returned as v + 27
+						let adjusted_v = if v < 27 { v } else { v - 27 };
+						Ok(Signature::from_rsv(&r, &s, adjusted_v as u8))
+					}
+				}
+			}
+			MessageType::MessageType_Failure => Err(Error::Protocol("Last message sent to Trezor failed")),
+			_ => Err(Error::Protocol("Unexpected response from Trezor device.")),
+		}
+	}
+
+	fn send_device_message(&self, device: &hidapi::HidDevice, msg_type: MessageType, msg: &Message) -> Result<usize, Error> {
+		let msg_id = msg_type as u16;
+		let mut message = msg.write_to_bytes()?;
+		let msg_size = message.len();
+		let mut data = Vec::new();
+		let hid_version = self.probe_hid_version(device)?;
+		// Magic constants
+		data.push(b'#');
+		data.push(b'#');
+		// Convert msg_id to BE and split into bytes
+		data.push(((msg_id >> 8) & 0xFF) as u8);
+		data.push((msg_id & 0xFF) as u8);
+		// Convert msg_size to BE and split into bytes
+		data.push(((msg_size >> 24) & 0xFF) as u8);
+		data.push(((msg_size >> 16) & 0xFF) as u8);
+		data.push(((msg_size >> 8) & 0xFF) as u8);
+		data.push((msg_size & 0xFF) as u8);
+		data.append(&mut message);
+		while data.len() % 63 > 0 {
+			data.push(0);
+		}
+		let mut total_written = 0;
+		for chunk in data.chunks(63) {
+			let mut padded_chunk = match hid_version {
+				HidVersion::V1 => vec![b'?'],
+				HidVersion::V2 => vec![0, b'?'],
+			};
+			padded_chunk.extend_from_slice(&chunk);
+			total_written += device.write(&padded_chunk)?;
+		}
+		Ok(total_written)
+	}
+
+	fn probe_hid_version(&self, device: &hidapi::HidDevice) -> Result<HidVersion, Error> {
+		let mut buf2 = [0xFF_u8; 65];
+		buf2[0] = 0;
+		buf2[1] = 63;
+		let mut buf1 = [0xFF_u8; 64];
+		buf1[0] = 63;
+		if device.write(&buf2)? == 65 {
+			Ok(HidVersion::V2)
+		} else if device.write(&buf1)? == 64 {
+			Ok(HidVersion::V1)
+		} else {
+			Err(Error::Usb("Unable to determine HID Version"))
+		}
+	}
+
+	fn read_device_response(&self, device: &hidapi::HidDevice) -> Result<(MessageType, Vec<u8>), Error> {
+		let protocol_err = Error::Protocol(&"Unexpected wire response from Trezor Device");
+		let mut buf = vec![0; 64];
+
+		let first_chunk = device.read_timeout(&mut buf, 300_000)?;
+		if first_chunk < 9 || buf[0] != b'?' || buf[1] != b'#' || buf[2] != b'#' {
+			return Err(protocol_err);
+		}
+		let msg_type = MessageType::from_i32(((buf[3] as i32 & 0xFF) << 8) + (buf[4] as i32 & 0xFF)).ok_or(protocol_err)?;
+		let msg_size = ((buf[5] as u32 & 0xFF) << 24) + ((buf[6] as u32 & 0xFF) << 16) + ((buf[7] as u32 & 0xFF) << 8) + (buf[8] as u32 & 0xFF);
+		let mut data = Vec::new();
+		data.extend_from_slice(&buf[9..]);
+		while data.len() < (msg_size as usize) {
+			device.read_timeout(&mut buf, 10_000)?;
+			data.extend_from_slice(&buf[1..]);
+		}
+		Ok((msg_type, data[..msg_size as usize].to_vec()))
+	}
+}
+
+impl<'a> Wallet<'a> for Manager {
+	type Error = Error;
+	type Transaction = &'a TransactionInfo;
+
+	fn sign_transaction(&self, address: &Address, t_info: Self::Transaction) ->
+		Result<Signature, Error> {
+		let usb = self.usb.lock();
+		let devices = self.devices.read();
+		let device = devices.iter().find(|d| &d.info.address == address).ok_or(Error::KeyNotFound)?;
+		let handle = self.open_path(|| usb.open_path(&device.path))?;
+		let msg_type = MessageType::MessageType_EthereumSignTx;
+		let mut message = EthereumSignTx::new();
+		match *self.key_path.read() {
+			KeyPath::Ethereum => message.set_address_n(ETH_DERIVATION_PATH.to_vec()),
+			KeyPath::EthereumClassic => message.set_address_n(ETC_DERIVATION_PATH.to_vec()),
+		}
+		message.set_nonce(self.u256_to_be_vec(&t_info.nonce));
+		message.set_gas_limit(self.u256_to_be_vec(&t_info.gas_limit));
+		message.set_gas_price(self.u256_to_be_vec(&t_info.gas_price));
+		message.set_value(self.u256_to_be_vec(&t_info.value));
+
+		if let Some(addr) = t_info.to {
+			message.set_to(addr.to_vec())
+		}
+		let first_chunk_length = min(t_info.data.len(), 1024);
+		let chunk = &t_info.data[0..first_chunk_length];
+		message.set_data_initial_chunk(chunk.to_vec());
+		message.set_data_length(t_info.data.len() as u32);
+		if let Some(c_id) = t_info.chain_id {
+			message.set_chain_id(c_id as u32);
+		}
+
+		self.send_device_message(&handle, msg_type, &message)?;
+
+		self.signing_loop(&handle, &t_info.chain_id, &t_info.data[first_chunk_length..])
+	}
+
+	fn set_key_path(&self, key_path: KeyPath) {
+		*self.key_path.write() = key_path;
+	}
+
+	fn update_devices(&self, device_direction: DeviceDirection) -> Result<usize, Error> {
+		let mut usb = self.usb.lock();
+		usb.refresh_devices();
+		let devices = usb.devices();
+		let num_prev_devices = self.devices.read().len();
+
+		let detected_devices = devices.iter()
+			.filter(|&d| is_valid_trezor(d.vendor_id, d.product_id) &&
+					is_valid_hid_device(d.usage_page, d.interface_number)
+			)
+			.fold(Vec::new(), |mut v, d| {
+				match self.read_device(&usb, &d) {
+					Ok(info) => {
+						trace!(target: "hw", "Found device: {:?}", info);
+						v.push(info);
+					}
+					Err(e) => trace!(target: "hw", "Error reading device info: {}", e),
+				};
+				v
+			});
+
+		let num_curr_devices = detected_devices.len();
+		*self.devices.write() = detected_devices;
+
+		match device_direction {
+			DeviceDirection::Arrived => {
+				if num_curr_devices > num_prev_devices {
+					Ok(num_curr_devices - num_prev_devices)
+				} else {
+					Err(Error::NoDeviceArrived)
+				}
+			}
+			DeviceDirection::Left => {
+				if num_prev_devices > num_curr_devices {
+					Ok(num_prev_devices - num_curr_devices)
+				} else {
+					Err(Error::NoDeviceLeft)
+				}
+			}
+		}
+	}
+
+	fn read_device(&self, usb: &hidapi::HidApi, dev_info: &hidapi::HidDeviceInfo) -> Result<Device, Error> {
+		let handle = self.open_path(|| usb.open_path(&dev_info.path))?;
+		let manufacturer = dev_info.manufacturer_string.clone().unwrap_or_else(|| "Unknown".to_owned());
+		let name = dev_info.product_string.clone().unwrap_or_else(|| "Unknown".to_owned());
+		let serial = dev_info.serial_number.clone().unwrap_or_else(|| "Unknown".to_owned());
+		match self.get_address(&handle) {
+			Ok(Some(addr)) => {
+				Ok(Device {
+					path: dev_info.path.clone(),
+					info: WalletInfo {
+						name,
+						manufacturer,
+						serial,
+						address: addr,
+					},
+				})
+			}
+			Ok(None) => Err(Error::LockedDevice(dev_info.path.clone())),
+			Err(e) => Err(e),
+		}
+	}
+
+	fn list_devices(&self) -> Vec<WalletInfo> {
+		self.devices.read().iter().map(|d| d.info.clone()).collect()
+	}
+
+	fn list_locked_devices(&self) -> Vec<String> {
+		(*self.locked_devices.read()).clone()
+	}
+
+	fn get_wallet(&self, address: &Address) -> Option<WalletInfo> {
+		self.devices.read().iter().find(|d| &d.info.address == address).map(|d| d.info.clone())
+	}
+
+	fn get_address(&self, device: &hidapi::HidDevice) -> Result<Option<Address>, Error> {
+		let typ = MessageType::MessageType_EthereumGetAddress;
+		let mut message = EthereumGetAddress::new();
+		match *self.key_path.read() {
+			KeyPath::Ethereum => message.set_address_n(ETH_DERIVATION_PATH.to_vec()),
+			KeyPath::EthereumClassic => message.set_address_n(ETC_DERIVATION_PATH.to_vec()),
+		}
+		message.set_show_display(false);
+		self.send_device_message(&device, typ, &message)?;
+
+		let (resp_type, bytes) = self.read_device_response(&device)?;
+		match resp_type {
+			MessageType::MessageType_EthereumAddress => {
+				let response: EthereumAddress = protobuf::core::parse_from_bytes(&bytes)?;
+				Ok(Some(From::from(response.get_address())))
+			}
+			_ => Ok(None),
+		}
+	}
+
+	fn open_path<R, F>(&self, f: F) -> Result<R, Error>
+		where F: Fn() -> Result<R, &'static str>
+	{
+		f().map_err(Into::into)
+	}
+}
+
+/// Poll the device in maximum `max_polling_duration` if it doesn't succeed
+pub fn try_connect_polling(trezor: &Manager, duration: &Duration, dir: DeviceDirection) -> bool {
+	let start_time = Instant::now();
+	while start_time.elapsed() <= *duration {
+		if let Ok(num_devices) = trezor.update_devices(dir) {
+			trace!(target: "hw", "{} Trezor devices {}", num_devices, dir);
+			return true
+		}
+	}
+	false
+}
+
+/// Check if the detected device is a Trezor device by checking both the product ID and the vendor ID
+pub fn is_valid_trezor(vid: u16, pid: u16) -> bool {
+	vid == TREZOR_VID && TREZOR_PIDS.contains(&pid)
+}
+
+#[test]
+#[ignore]
+/// This test can't be run without an actual trezor device connected
+/// (and unlocked) attached to the machine that's running the test
+fn test_signature() {
+	use ethereum_types::Address;
+	use MAX_POLLING_DURATION;
+	use super::HardwareWalletManager;
+
+	let manager = HardwareWalletManager::new().unwrap();
+
+	assert_eq!(try_connect_polling(&manager.trezor, &MAX_POLLING_DURATION, DeviceDirection::Arrived), true);
+
+	let addr: Address = manager.list_wallets()
+		.iter()
+		.filter(|d| d.name == "TREZOR".to_string() && d.manufacturer == "SatoshiLabs".to_string())
+		.nth(0)
+		.map(|d| d.address)
+		.unwrap();
+
+	let t_info = TransactionInfo {
+		nonce: U256::from(1),
+		gas_price: U256::from(100),
+		gas_limit: U256::from(21_000),
+		to: Some(Address::from(1337)),
+		chain_id: Some(1),
+		value: U256::from(1_000_000),
+		data: (&[1u8; 3000]).to_vec(),
+	};
+
+	let signature = manager.trezor.sign_transaction(&addr, &t_info);
+	assert!(signature.is_ok());
+}
--- a/accounts/src/error.rs
+++ b/accounts/src/error.rs
@@ -17,6 +17,7 @@
 use std::fmt;

 use ethstore::{Error as SSError};
+use hardware_wallet::{Error as HardwareError};

 /// Signing error
 #[derive(Debug)]
@@ -25,6 +26,8 @@ pub enum SignError {
 	NotUnlocked,
 	/// Account does not exist.
 	NotFound,
+	/// Low-level hardware device error.
+	Hardware(HardwareError),
 	/// Low-level error from store
 	SStore(SSError),
 }
@@ -34,11 +37,18 @@ impl fmt::Display for SignError {
 		match *self {
 			SignError::NotUnlocked => write!(f, "Account is locked"),
 			SignError::NotFound => write!(f, "Account does not exist"),
+			SignError::Hardware(ref e) => write!(f, "{}", e),
 			SignError::SStore(ref e) => write!(f, "{}", e),
 		}
 	}
 }

+impl From<HardwareError> for SignError {
+	fn from(e: HardwareError) -> Self {
+		SignError::Hardware(e)
+	}
+}
+
 impl From<SSError> for SignError {
 	fn from(e: SSError) -> Self {
 		SignError::SStore(e)
--- a/accounts/src/lib.rs
+++ b/accounts/src/lib.rs
@@ -22,23 +22,28 @@ mod account_data;
 mod error;
 mod stores;

+#[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))]
+extern crate fake_hardware_wallet as hardware_wallet;
+
 use self::account_data::{Unlock, AccountData};
 use self::stores::AddressBook;

 use std::collections::HashMap;
 use std::time::{Instant, Duration};

+use common_types::transaction::{Action, Transaction};
 use ethkey::{Address, Message, Public, Secret, Password, Random, Generator};
 use ethstore::accounts_dir::MemoryDirectory;
 use ethstore::{
 	SimpleSecretStore, SecretStore, EthStore, EthMultiStore,
 	random_string, SecretVaultRef, StoreAccountRef, OpaqueSecret,
 };
-use log::warn;
+use log::{warn, debug};
 use parking_lot::RwLock;

 pub use ethkey::Signature;
 pub use ethstore::{Derivation, IndexDerivation, KeyFile, Error};
+pub use hardware_wallet::{Error as HardwareError, HardwareWalletManager, KeyPath, TransactionInfo};

 pub use self::account_data::AccountMeta;
 pub use self::error::SignError;
@@ -48,6 +53,10 @@ type AccountToken = Password;
 /// Account management settings.
 #[derive(Debug, Default)]
 pub struct AccountProviderSettings {
+	/// Enable hardware wallet support.
+	pub enable_hardware_wallets: bool,
+	/// Use the classic chain key on the hardware wallet.
+	pub hardware_wallet_classic_key: bool,
 	/// Store raw account secret when unlocking the account permanently.
 	pub unlock_keep_secret: bool,
 	/// Disallowed accounts.
@@ -67,6 +76,8 @@ pub struct AccountProvider {
 	sstore: Box<SecretStore>,
 	/// Accounts unlocked with rolling tokens
 	transient_sstore: EthMultiStore,
+	/// Accounts in hardware wallets.
+	hardware_store: Option<HardwareWalletManager>,
 	/// When unlocking account permanently we additionally keep a raw secret in memory
 	/// to increase the performance of transaction signing.
 	unlock_keep_secret: bool,
@@ -81,6 +92,18 @@ fn transient_sstore() -> EthMultiStore {
 impl AccountProvider {
 	/// Creates new account provider.
 	pub fn new(sstore: Box<SecretStore>, settings: AccountProviderSettings) -> Self {
+		let mut hardware_store = None;
+
+		if settings.enable_hardware_wallets {
+			match HardwareWalletManager::new() {
+				Ok(manager) => {
+					manager.set_key_path(if settings.hardware_wallet_classic_key { KeyPath::EthereumClassic } else { KeyPath::Ethereum });
+					hardware_store = Some(manager)
+				},
+				Err(e) => debug!("Error initializing hardware wallets: {}", e),
+			}
+		}
+
 		if let Ok(accounts) = sstore.accounts() {
 			for account in accounts.into_iter().filter(|a| settings.blacklisted_accounts.contains(&a.address)) {
 				warn!("Local Account {} has a blacklisted (known to be weak) address and will be ignored",
@@ -98,8 +121,9 @@ impl AccountProvider {
 			unlocked_secrets: RwLock::new(HashMap::new()),
 			unlocked: RwLock::new(HashMap::new()),
 			address_book: RwLock::new(address_book),
-			sstore,
+			sstore: sstore,
 			transient_sstore: transient_sstore(),
+			hardware_store: hardware_store,
 			unlock_keep_secret: settings.unlock_keep_secret,
 			blacklisted_accounts: settings.blacklisted_accounts,
 		}
@@ -113,6 +137,7 @@ impl AccountProvider {
 			address_book: RwLock::new(AddressBook::transient()),
 			sstore: Box::new(EthStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory load always succeeds; qed")),
 			transient_sstore: transient_sstore(),
+			hardware_store: None,
 			unlock_keep_secret: false,
 			blacklisted_accounts: vec![],
 		}
@@ -194,6 +219,34 @@ impl AccountProvider {
 		Ok(self.accounts()?.first().cloned().unwrap_or_default())
 	}

+	/// Returns addresses of hardware accounts.
+	pub fn hardware_accounts(&self) -> Result<Vec<Address>, Error> {
+		if let Some(accounts) = self.hardware_store.as_ref().map(|h| h.list_wallets()) {
+			if !accounts.is_empty() {
+				return Ok(accounts.into_iter().map(|a| a.address).collect());
+			}
+		}
+		Err(Error::Custom("No hardware wallet accounts were found".into()))
+	}
+
+	/// Get a list of paths to locked hardware wallets
+	pub fn locked_hardware_accounts(&self) -> Result<Vec<String>, SignError> {
+		match self.hardware_store.as_ref().map(|h| h.list_locked_wallets()) {
+			None => Err(SignError::NotFound),
+			Some(Err(e)) => Err(SignError::Hardware(e)),
+			Some(Ok(s)) => Ok(s),
+		}
+	}
+
+	/// Provide a pin to a locked hardware wallet on USB path to unlock it
+	pub fn hardware_pin_matrix_ack(&self, path: &str, pin: &str) -> Result<bool, SignError> {
+		match self.hardware_store.as_ref().map(|h| h.pin_matrix_ack(path, pin)) {
+			None => Err(SignError::NotFound),
+			Some(Err(e)) => Err(SignError::Hardware(e)),
+			Some(Ok(s)) => Ok(s),
+		}
+	}
+
 	/// Returns each address along with metadata.
 	pub fn addresses_info(&self) -> HashMap<Address, AccountMeta> {
 		self.address_book.read().get()
@@ -224,14 +277,36 @@ impl AccountProvider {
 		Ok(r)
 	}

+	/// Returns each hardware account along with name and meta.
+	pub fn hardware_accounts_info(&self) -> Result<HashMap<Address, AccountMeta>, Error> {
+		let r = self.hardware_accounts()?
+			.into_iter()
+			.map(|address| (address.clone(), self.account_meta(address).ok().unwrap_or_default()))
+			.collect();
+		Ok(r)
+	}
+
+	/// Returns each hardware account along with name and meta.
+	pub fn is_hardware_address(&self, address: &Address) -> bool {
+		self.hardware_store.as_ref().and_then(|s| s.wallet_info(address)).is_some()
+	}
+
 	/// Returns each account along with name and meta.
 	pub fn account_meta(&self, address: Address) -> Result<AccountMeta, Error> {
-		let account = self.sstore.account_ref(&address)?;
-		Ok(AccountMeta {
-			name: self.sstore.name(&account)?,
-			meta: self.sstore.meta(&account)?,
-			uuid: self.sstore.uuid(&account).ok().map(Into::into),	// allowed to not have a Uuid
-		})
+		if let Some(info) = self.hardware_store.as_ref().and_then(|s| s.wallet_info(&address)) {
+			Ok(AccountMeta {
+				name: info.name,
+				meta: info.manufacturer,
+				uuid: None,
+			})
+		} else {
+			let account = self.sstore.account_ref(&address)?;
+			Ok(AccountMeta {
+				name: self.sstore.name(&account)?,
+				meta: self.sstore.meta(&account)?,
+				uuid: self.sstore.uuid(&account).ok().map(Into::into),	// allowed to not have a Uuid
+			})
+		}
 	}

 	/// Returns account public key.
@@ -295,7 +370,10 @@ impl AccountProvider {
 			let _ = self.sstore.sign(&account, &password, &Default::default())?;
 		}

-		let data = AccountData { unlock, password };
+		let data = AccountData {
+			unlock: unlock,
+			password: password,
+		};

 		unlocked.insert(account, data);
 		Ok(())
@@ -497,6 +575,36 @@ impl AccountProvider {
 		self.sstore.set_vault_meta(name, meta)
 			.map_err(Into::into)
 	}
+
+	/// Sign message with hardware wallet.
+	pub fn sign_message_with_hardware(&self, address: &Address, message: &[u8]) -> Result<Signature, SignError> {
+		match self.hardware_store.as_ref().map(|s| s.sign_message(address, message)) {
+			None | Some(Err(HardwareError::KeyNotFound)) => Err(SignError::NotFound),
+			Some(Err(e)) => Err(From::from(e)),
+			Some(Ok(s)) => Ok(s),
+		}
+	}
+
+	/// Sign transaction with hardware wallet.
+	pub fn sign_transaction_with_hardware(&self, address: &Address, transaction: &Transaction, chain_id: Option<u64>, rlp_encoded_transaction: &[u8]) -> Result<Signature, SignError> {
+		let t_info = TransactionInfo {
+			nonce: transaction.nonce,
+			gas_price: transaction.gas_price,
+			gas_limit: transaction.gas,
+			to: match transaction.action {
+				Action::Create => None,
+				Action::Call(ref to) => Some(to.clone()),
+			},
+			value: transaction.value,
+			data: transaction.data.to_vec(),
+			chain_id: chain_id,
+		};
+		match self.hardware_store.as_ref().map(|s| s.sign_transaction(&address, &t_info, rlp_encoded_transaction)) {
+			None | Some(Err(HardwareError::KeyNotFound)) => Err(SignError::NotFound),
+			Some(Err(e)) => Err(From::from(e)),
+			Some(Ok(s)) => Ok(s),
+		}
+	}
 }

 #[cfg(test)]
@@ -528,7 +636,7 @@ mod tests {
 		let derived_addr = ap.derive_account(
 			&kp.address(),
 			None,
-			Derivation::SoftHash(H256::from_low_u64_be(999)),
+			Derivation::SoftHash(H256::from(999)),
 			false,
 		).expect("Derivation should not fail");

@@ -546,7 +654,7 @@ mod tests {
 		let derived_addr = ap.derive_account(
 			&kp.address(),
 			None,
-			Derivation::SoftHash(H256::from_low_u64_be(999)),
+			Derivation::SoftHash(H256::from(999)),
 			true,
 		).expect("Derivation should not fail");

@@ -567,7 +675,7 @@ mod tests {
 		let derived_addr = ap.derive_account(
 			&kp.address(),
 			None,
-			Derivation::SoftHash(H256::from_low_u64_be(1999)),
+			Derivation::SoftHash(H256::from(1999)),
 			true,
 		).expect("Derivation should not fail");
 		ap.unlock_account_permanently(derived_addr, "base".into())
@@ -579,7 +687,7 @@ mod tests {
 		let signed_msg2 = ap.sign_derived(
 			&kp.address(),
 			None,
-			Derivation::SoftHash(H256::from_low_u64_be(1999)),
+			Derivation::SoftHash(H256::from(1999)),
 			msg,
 		).expect("Derived signing with existing unlocked account should not fail");

--- a/accounts/src/stores.rs
+++ b/accounts/src/stores.rs
@@ -153,7 +153,7 @@ impl<K: hash::Hash + Eq, V> DiskMap<K, V> {

 #[cfg(test)]
 mod tests {
-	use super::{AddressBook, Address};
+	use super::AddressBook;
 	use std::collections::HashMap;
 	use tempdir::TempDir;
 	use crate::account_data::AccountMeta;
@@ -162,12 +162,12 @@ mod tests {
 	fn should_save_and_reload_address_book() {
 		let tempdir = TempDir::new("").unwrap();
 		let mut b = AddressBook::new(tempdir.path());
-		b.set_name(Address::from_low_u64_be(1), "One".to_owned());
-		b.set_meta(Address::from_low_u64_be(1), "{1:1}".to_owned());
+		b.set_name(1.into(), "One".to_owned());
+		b.set_meta(1.into(), "{1:1}".to_owned());
 		let b = AddressBook::new(tempdir.path());
 		assert_eq!(b.get(), vec![
-		   (Address::from_low_u64_be(1), AccountMeta {name: "One".to_owned(), meta: "{1:1}".to_owned(), uuid: None})
-		].into_iter().collect::<HashMap<_, _>>());
+		   (1, AccountMeta {name: "One".to_owned(), meta: "{1:1}".to_owned(), uuid: None})
+		].into_iter().map(|(a, b)| (a.into(), b)).collect::<HashMap<_, _>>());
 	}

 	#[test]
@@ -175,15 +175,15 @@ mod tests {
 		let tempdir = TempDir::new("").unwrap();
 		let mut b = AddressBook::new(tempdir.path());

-		b.set_name(Address::from_low_u64_be(1), "One".to_owned());
-		b.set_name(Address::from_low_u64_be(2), "Two".to_owned());
-		b.set_name(Address::from_low_u64_be(3), "Three".to_owned());
-		b.remove(Address::from_low_u64_be(2).into());
+		b.set_name(1.into(), "One".to_owned());
+		b.set_name(2.into(), "Two".to_owned());
+		b.set_name(3.into(), "Three".to_owned());
+		b.remove(2.into());

 		let b = AddressBook::new(tempdir.path());
 		assert_eq!(b.get(), vec![
-			(Address::from_low_u64_be(1), AccountMeta{name: "One".to_owned(), meta: "{}".to_owned(), uuid: None}),
-			(Address::from_low_u64_be(3), AccountMeta{name: "Three".to_owned(), meta: "{}".to_owned(), uuid: None}),
-		].into_iter().collect::<HashMap<_, _>>());
+			(1, AccountMeta{name: "One".to_owned(), meta: "{}".to_owned(), uuid: None}),
+			(3, AccountMeta{name: "Three".to_owned(), meta: "{}".to_owned(), uuid: None}),
+		].into_iter().map(|(a, b)| (a.into(), b)).collect::<HashMap<_, _>>());
 	}
 }
--- a/chainspec/Cargo.toml
+++ b/chainspec/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Chain Specification"
 name = "chainspec"
 version = "0.1.0"
 authors = ["Marek Kotewicz <marek@parity.io>"]
--- a/cli-signer/Cargo.toml
+++ b/cli-signer/Cargo.toml
@@ -1,13 +1,13 @@
 [package]
-description = "Parity Ethereum CLI Signer Tool"
+authors = ["Parity <admin@parity.io>"]
+description = "Parity Cli Tool"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "cli-signer"
 version = "1.4.0"
-authors = ["Parity <admin@parity.io>"]

 [dependencies]
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 futures = "0.1"
 rpassword = "1.0"
 parity-rpc = { path = "../rpc" }
--- a/cli-signer/rpc-client/Cargo.toml
+++ b/cli-signer/rpc-client/Cargo.toml
@@ -1,13 +1,13 @@
 [package]
-description = "Parity Ethereum RPC Client"
+authors = ["Parity <admin@parity.io>"]
+description = "Parity Rpc Client"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "parity-rpc-client"
 version = "1.4.0"
-authors = ["Parity <admin@parity.io>"]

 [dependencies]
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 futures = "0.1"
 log = "0.4"
 serde = "1.0"
@@ -15,7 +15,7 @@ serde_json = "1.0"
 url = "1.2.0"
 matches = "0.1"
 parking_lot = "0.7"
-jsonrpc-core = "12.0.0"
-jsonrpc-ws-server = "12.0.0"
+jsonrpc-core = "10.0.1"
+jsonrpc-ws-server = "10.0.1"
 parity-rpc = { path = "../../rpc" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
--- a/ethash/Cargo.toml
+++ b/ethash/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Ethash & ProgPoW Implementations"
 name = "ethash"
 version = "1.12.0"
 authors = ["Parity Technologies <admin@parity.io>"]
@@ -7,8 +6,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 crunchy = "0.1.0"
 either = "1.0.0"
-ethereum-types = "0.6.0"
-keccak-hash = "0.2.0"
+ethereum-types = "0.4"
+keccak-hash = "0.1"
 log = "0.4"
 memmap = "0.6"
 parking_lot = "0.7"
--- a/ethash/src/lib.rs
+++ b/ethash/src/lib.rs
@@ -52,14 +52,14 @@ mod progpow;
 pub use cache::{NodeCacheBuilder, OptimizeFor};
 pub use compute::{ProofOfWork, quick_get_difficulty, slow_hash_block_number};
 use compute::Light;
-use ethereum_types::{BigEndianHash, U256, U512};
+use ethereum_types::{U256, U512};
 use keccak::H256;
 use parking_lot::Mutex;
 pub use seed_compute::SeedHashCompute;
 pub use shared::ETHASH_EPOCH_LENGTH;
 use std::mem;
 use std::path::{Path, PathBuf};
-use std::convert::TryFrom;
+
 use std::sync::Arc;

 struct LightCache {
@@ -161,12 +161,12 @@ impl EthashManager {

 /// Convert an Ethash boundary to its original difficulty. Basically just `f(x) = 2^256 / x`.
 pub fn boundary_to_difficulty(boundary: &ethereum_types::H256) -> U256 {
-	difficulty_to_boundary_aux(&boundary.into_uint())
+	difficulty_to_boundary_aux(&**boundary)
 }

 /// Convert an Ethash difficulty to the target boundary. Basically just `f(x) = 2^256 / x`.
 pub fn difficulty_to_boundary(difficulty: &U256) -> ethereum_types::H256 {
-	BigEndianHash::from_uint(&difficulty_to_boundary_aux(difficulty))
+	difficulty_to_boundary_aux(difficulty).into()
 }

 fn difficulty_to_boundary_aux<T: Into<U512>>(difficulty: T) -> ethereum_types::U256 {
@@ -177,8 +177,8 @@ fn difficulty_to_boundary_aux<T: Into<U512>>(difficulty: T) -> ethereum_types::U
 	if difficulty == U512::one() {
 		U256::max_value()
 	} else {
-		const PROOF: &str = "difficulty > 1, so result never overflows 256 bits; qed";
-		U256::try_from((U512::one() << 256) / difficulty).expect(PROOF)
+		// difficulty > 1, so result should never overflow 256 bits
+		U256::from((U512::one() << 256) / difficulty)
 	}
 }

@@ -203,10 +203,10 @@ fn test_lru() {

 #[test]
 fn test_difficulty_to_boundary() {
-	use ethereum_types::{H256, BigEndianHash};
+	use ethereum_types::H256;
 	use std::str::FromStr;

-	assert_eq!(difficulty_to_boundary(&U256::from(1)), BigEndianHash::from_uint(&U256::max_value()));
+	assert_eq!(difficulty_to_boundary(&U256::from(1)), H256::from(U256::max_value()));
 	assert_eq!(difficulty_to_boundary(&U256::from(2)), H256::from_str("8000000000000000000000000000000000000000000000000000000000000000").unwrap());
 	assert_eq!(difficulty_to_boundary(&U256::from(4)), H256::from_str("4000000000000000000000000000000000000000000000000000000000000000").unwrap());
 	assert_eq!(difficulty_to_boundary(&U256::from(32)), H256::from_str("0800000000000000000000000000000000000000000000000000000000000000").unwrap());
@@ -220,18 +220,9 @@ fn test_difficulty_to_boundary_regression() {
 	// https://github.com/paritytech/parity-ethereum/issues/8397
 	for difficulty in 1..9 {
 		assert_eq!(U256::from(difficulty), boundary_to_difficulty(&difficulty_to_boundary(&difficulty.into())));
-		assert_eq!(
-			H256::from_low_u64_be(difficulty),
-			difficulty_to_boundary(&boundary_to_difficulty(&H256::from_low_u64_be(difficulty))),
-		);
-		assert_eq!(
-			U256::from(difficulty),
-			boundary_to_difficulty(&BigEndianHash::from_uint(&boundary_to_difficulty(&H256::from_low_u64_be(difficulty)))),
-		);
-		assert_eq!(
-			H256::from_low_u64_be(difficulty),
-			difficulty_to_boundary(&difficulty_to_boundary(&difficulty.into()).into_uint()),
-		);
+		assert_eq!(H256::from(difficulty), difficulty_to_boundary(&boundary_to_difficulty(&difficulty.into())));
+		assert_eq!(U256::from(difficulty), boundary_to_difficulty(&boundary_to_difficulty(&difficulty.into()).into()));
+		assert_eq!(H256::from(difficulty), difficulty_to_boundary(&difficulty_to_boundary(&difficulty.into()).into()));
 	}
 }

@@ -244,5 +235,5 @@ fn test_difficulty_to_boundary_panics_on_zero() {
 #[test]
 #[should_panic]
 fn test_boundary_to_difficulty_panics_on_zero() {
-	boundary_to_difficulty(&ethereum_types::H256::zero());
+	boundary_to_difficulty(&ethereum_types::H256::from(0));
 }
--- a/ethash/src/progpow.rs
+++ b/ethash/src/progpow.rs
@@ -14,22 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

-//! ProgPoW (Programmatic Proof-of-Work) is the Ethereum network's proposed new Application-Specific Integrated
-//! Circuit (ASIC) resistant Proof-of-Work mining algorithm.
-//!
-//! ProgPoW's aim is to reduce the efficiencies of specialized mining devices known as ASIC chips
-//! (and accelerated GPU-based setups), and to maximize the performance of General Purpose Hardware (GPUs) to enable
-//! more users to compete for new cryptocurrency awarded by the protocol.
-//!
-//! ASIC chips are those that are tailored to efficiently mining cryptocurrency based on a specific hashing algorithm.
-//!
-//! GPU mining setups are less specialised are struggle to compete for mining rewards.
-//!
-//! It would be a change from Ethereum's current PoW mining algorithm known as Ethash.
-//!
-//! ProgPoW audits have been proposed to analyse the efficiency of a ProgPoW ASICs over
-//! GPUs and analysis of the economic impact on the Ethereum protocol.
-
 use compute::{FNV_PRIME, calculate_dag_item};
 use keccak::H256;
 use shared::{ETHASH_ACCESSES, ETHASH_MIX_BYTES, Node, get_data_size};
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-description = "Parity Ethereum (EthCore) Library"
+description = "Ethcore library"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "ethcore"
@@ -7,17 +7,17 @@ version = "1.12.0"
 authors = ["Parity Technologies <admin@parity.io>"]

 [dependencies]
-account-db = { path = "account-db" }
-ansi_term = "0.11"
+ansi_term = "0.10"
 blooms-db = { path = "../util/blooms-db", optional = true }
 bn = { git = "https://github.com/paritytech/bn", default-features = false }
+byteorder = "1.0"
 common-types = { path = "types" }
 crossbeam = "0.4"
-derive_more = "0.14.0"
 env_logger = { version = "0.5", optional = true }
-ethabi = "8.0"
-ethabi-contract = "8.0"
-ethabi-derive = "8.0"
+error-chain = { version = "0.12", default-features = false }
+ethabi = "6.0"
+ethabi-contract = "6.0"
+ethabi-derive = "6.0"
 ethash = { path = "../ethash" }
 ethcore-blockchain = { path = "./blockchain" }
 ethcore-bloom-journal = { path = "../util/bloom" }
@@ -26,16 +26,15 @@ ethcore-db = { path = "./db" }
 ethcore-io = { path = "../util/io" }
 ethcore-miner = { path = "../miner" }
 ethcore-stratum = { path = "../miner/stratum", optional = true }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 ethjson = { path = "../json" }
 ethkey = { path = "../accounts/ethkey" }
 evm = { path = "evm" }
-futures = "0.1"
-hash-db = "0.12.4"
-parity-util-mem = "0.1"
+hash-db = "0.11.0"
+heapsize = "0.4"
 itertools = "0.5"
 journaldb = { path = "../util/journaldb" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
 keccak-hasher = { path = "../util/keccak-hasher" }
 kvdb = "0.1"
 kvdb-memorydb = "0.1"
@@ -46,26 +45,24 @@ log = "0.4"
 lru-cache = "0.1"
 macros = { path = "../util/macros" }
 memory-cache = { path = "../util/memory-cache" }
-memory-db = "0.12.4"
+memory-db = "0.11.0"
 num = { version = "0.1", default-features = false, features = ["bigint"] }
 num_cpus = "1.2"
 parity-bytes = "0.1"
-parity-crypto = "0.4.0"
+parity-crypto = "0.3.0"
 parity-snappy = "0.1"
 parking_lot = "0.7"
-pod-account = { path = "pod-account" }
-trie-db = "0.12.4"
+trie-db = "0.11.0"
 patricia-trie-ethereum = { path = "../util/patricia-trie-ethereum" }
-rand = "0.6"
+rand = "0.4"
 rayon = "1.0"
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 rlp_derive = { path = "../util/rlp-derive" }
 rustc-hex = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
-state-account = { path = "state-account" }
 stats = { path = "../util/stats" }
-tempdir = { version = "0.3", optional = true }
+tempdir = {version="0.3", optional = true}
 time-utils = { path = "../util/time-utils" }
 trace-time = "0.1"
 triehash-ethereum = { version = "0.2",  path = "../util/triehash-ethereum" }
@@ -73,7 +70,6 @@ unexpected = { path = "../util/unexpected" }
 using_queue = { path = "../miner/using-queue" }
 vm = { path = "vm" }
 wasm = { path = "wasm" }
-rand_xorshift = "0.1.1"

 [dev-dependencies]
 blooms-db = { path = "../util/blooms-db" }
@@ -84,9 +80,8 @@ fetch = { path = "../util/fetch" }
 kvdb-rocksdb = "0.1.3"
 parity-runtime = { path = "../util/runtime" }
 rlp_compress = { path = "../util/rlp-compress" }
-serde_json = "1.0"
 tempdir = "0.3"
-trie-standardmap = "0.12.4"
+trie-standardmap = "0.1"

 [features]
 parity = ["work-notify", "price-info", "stratum"]
--- a/ethcore/account-db/Cargo.toml
+++ b/ethcore/account-db/Cargo.toml
@@ -1,14 +0,0 @@
-[package]
-description = "DB backend wrapper for Account trie"
-name = "account-db"
-version = "0.1.0"
-authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
-
-[dependencies]
-ethereum-types = "0.6"
-hash-db = "0.12.4"
-keccak-hash = "0.2.0"
-keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.1"
-rlp = "0.4"
--- a/ethcore/benches/builtin.rs
+++ b/ethcore/benches/builtin.rs
@@ -28,13 +28,13 @@ extern crate rustc_hex;
 use criterion::{Criterion, Bencher};
 use bytes::BytesRef;
 use ethcore::builtin::Builtin;
-use ethcore::machine::Machine;
-use ethereum_types::H160;
+use ethcore::machine::EthereumMachine;
+use ethereum_types::U256;
 use ethcore::ethereum::new_byzantium_test_machine;
 use rustc_hex::FromHex;

 lazy_static! {
-	static ref BYZANTIUM_MACHINE: Machine = new_byzantium_test_machine();
+	static ref BYZANTIUM_MACHINE: EthereumMachine = new_byzantium_test_machine();
 }

 struct BuiltinBenchmark<'a> {
@@ -46,9 +46,8 @@ struct BuiltinBenchmark<'a> {
 impl<'a> BuiltinBenchmark<'a> {
 	fn new(builtin_address: &'static str, input: &str, expected: &str) -> BuiltinBenchmark<'a> {
 		let builtins = BYZANTIUM_MACHINE.builtins();
-		use std::str::FromStr;
-		let addr = H160::from_str(builtin_address).unwrap();
-		let builtin = builtins.get(&addr).unwrap().clone();
+
+		let builtin = builtins.get(&builtin_address.into()).unwrap().clone();
 		let input = FromHex::from_hex(input).unwrap();
 		let expected = FromHex::from_hex(expected).unwrap();

@@ -57,6 +56,10 @@ impl<'a> BuiltinBenchmark<'a> {
 		}
 	}

+	fn gas_cost(&self) -> U256 {
+		self.builtin.cost(&self.input)
+	}
+
 	fn run(&self, b: &mut Bencher) {
 		let mut output = vec![0; self.expected.len()];

--- a/ethcore/blockchain/Cargo.toml
+++ b/ethcore/blockchain/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-description = "Parity Ethereum Blockchain Database, Test Generator, Configuration, Caching, Importing Blocks, and Block Information"
+description = "Ethcore blockchain database"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "ethcore-blockchain"
@@ -8,26 +8,26 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"

 [dependencies]
-ansi_term = "0.11"
+ansi_term = "0.10"
 blooms-db = { path = "../../util/blooms-db" }
 common-types = { path = "../types" }
 ethcore-db = { path = "../db" }
-ethereum-types = "0.6.0"
-parity-util-mem = "0.1"
+ethereum-types = "0.4"
+heapsize = "0.4"
 itertools = "0.5"
 kvdb = "0.1"
 log = "0.4"
 parity-bytes = "0.1"
 parking_lot = "0.7"
 rayon = "1.0"
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 rlp_compress = { path = "../../util/rlp-compress" }
 rlp_derive = { path = "../../util/rlp-derive" }

 [dev-dependencies]
 env_logger = "0.5"
 ethkey = { path = "../../accounts/ethkey" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
 rustc-hex = "1.0"
 tempdir = "0.3"
 kvdb-memorydb = "0.1"
--- a/ethcore/blockchain/src/best_block.rs
+++ b/ethcore/blockchain/src/best_block.rs
@@ -24,8 +24,7 @@ use common_types::header::Header;
 /// For GHOST fork-choice rule it would typically describe the block with highest
 /// combined difficulty (usually the block with the highest block number).
 ///
-/// Sometimes referred as 'latest block'.
-#[derive(Debug)]
+/// Sometimes refered as 'latest block'.
 pub struct BestBlock {
 	/// Best block decoded header.
 	pub header: Header,
@@ -36,7 +35,7 @@ pub struct BestBlock {
 }

 /// Best ancient block info. If the blockchain has a gap this keeps track of where it starts.
-#[derive(Debug, Default)]
+#[derive(Default)]
 pub struct BestAncientBlock {
 	/// Best block hash.
 	pub hash: H256,
--- a/ethcore/blockchain/src/blockchain.rs
+++ b/ethcore/blockchain/src/blockchain.rs
@@ -39,10 +39,10 @@ use ethcore_db::cache_manager::CacheManager;
 use ethcore_db::keys::{BlockReceipts, BlockDetails, TransactionAddress, EPOCH_KEY_PREFIX, EpochTransitions};
 use ethcore_db::{self as db, Writable, Readable, CacheUpdatePolicy};
 use ethereum_types::{H256, Bloom, BloomRef, U256};
-use util_mem::{MallocSizeOf, allocators::new_malloc_size_ops};
+use heapsize::HeapSizeOf;
 use itertools::Itertools;
 use kvdb::{DBTransaction, KeyValueDB};
-use log::{trace, debug, warn, info};
+use log::{trace, warn, info};
 use parity_bytes::Bytes;
 use parking_lot::{Mutex, RwLock};
 use rayon::prelude::*;
@@ -57,7 +57,7 @@ use crate::{CacheSize, ImportRoute, Config};
 /// Database backing `BlockChain`.
 pub trait BlockChainDB: Send + Sync {
 	/// Generic key value store.
-	fn key_value(&self) -> &Arc<dyn KeyValueDB>;
+	fn key_value(&self) -> &Arc<KeyValueDB>;

 	/// Header blooms database.
 	fn blooms(&self) -> &blooms_db::Database;
@@ -85,7 +85,7 @@ pub trait BlockChainDB: Send + Sync {
 /// predefined config.
 pub trait BlockChainDBHandler: Send + Sync {
 	/// Open the predefined key-value database.
-	fn open(&self, path: &Path) -> io::Result<Arc<dyn BlockChainDB>>;
+	fn open(&self, path: &Path) -> io::Result<Arc<BlockChainDB>>;
 }

 /// Interface for querying blocks by hash and by number.
@@ -228,7 +228,7 @@ pub struct BlockChain {
 	transaction_addresses: RwLock<HashMap<H256, TransactionAddress>>,
 	block_receipts: RwLock<HashMap<H256, BlockReceipts>>,

-	db: Arc<dyn BlockChainDB>,
+	db: Arc<BlockChainDB>,

 	cache_man: Mutex<CacheManager<CacheId>>,

@@ -284,7 +284,7 @@ impl BlockProvider for BlockChain {
 		}

 		// Read from DB and populate cache
-		let b = self.db.key_value().get(db::COL_HEADERS, hash.as_bytes())
+		let b = self.db.key_value().get(db::COL_HEADERS, hash)
 			.expect("Low level database error when fetching block header data. Some issue with disk?")?;

 		let header = encoded::Header::new(decompress(&b, blocks_swapper()).into_vec());
@@ -314,7 +314,7 @@ impl BlockProvider for BlockChain {
 		}

 		// Read from DB and populate cache
-		let b = self.db.key_value().get(db::COL_BODIES, hash.as_bytes())
+		let b = self.db.key_value().get(db::COL_BODIES, hash)
 			.expect("Low level database error when fetching block body data. Some issue with disk?")?;

 		let body = encoded::Body::new(decompress(&b, blocks_swapper()).into_vec());
@@ -469,7 +469,7 @@ impl<'a> Iterator for AncestryWithMetadataIter<'a> {
 					})
 				},
 				_ => {
-					self.current = H256::zero();
+					self.current = H256::default();
 					None
 				},
 			}
@@ -481,7 +481,7 @@ impl<'a> Iterator for AncestryWithMetadataIter<'a> {
 /// Returns epoch transitions.
 pub struct EpochTransitionIter<'a> {
 	chain: &'a BlockChain,
-	prefix_iter: Box<dyn Iterator<Item=(Box<[u8]>, Box<[u8]>)> + 'a>,
+	prefix_iter: Box<Iterator<Item=(Box<[u8]>, Box<[u8]>)> + 'a>,
 }

 impl<'a> Iterator for EpochTransitionIter<'a> {
@@ -521,7 +521,7 @@ impl<'a> Iterator for EpochTransitionIter<'a> {

 impl BlockChain {
 	/// Create new instance of blockchain from given Genesis.
-	pub fn new(config: Config, genesis: &[u8], db: Arc<dyn BlockChainDB>) -> BlockChain {
+	pub fn new(config: Config, genesis: &[u8], db: Arc<BlockChainDB>) -> BlockChain {
 		// 400 is the average size of the key
 		let cache_man = CacheManager::new(config.pref_cache_size, config.max_cache_size, 400);

@@ -572,13 +572,13 @@ impl BlockChain {
 				};

 				let mut batch = DBTransaction::new();
-				batch.put(db::COL_HEADERS, hash.as_bytes(), block.header_rlp().as_raw());
-				batch.put(db::COL_BODIES, hash.as_bytes(), &Self::block_to_body(genesis));
+				batch.put(db::COL_HEADERS, &hash, block.header_rlp().as_raw());
+				batch.put(db::COL_BODIES, &hash, &Self::block_to_body(genesis));

 				batch.write(db::COL_EXTRA, &hash, &details);
 				batch.write(db::COL_EXTRA, &header.number(), &hash);

-				batch.put(db::COL_EXTRA, b"best", hash.as_bytes());
+				batch.put(db::COL_EXTRA, b"best", &hash);
 				bc.db.key_value().write(batch).expect("Low level database error when fetching 'best' block. Some issue with disk?");
 				hash
 			}
@@ -639,7 +639,7 @@ impl BlockChain {
 					if hash != bc.genesis_hash() {
 						trace!("First block calculated: {:?}", hash);
 						let mut batch = db.key_value().transaction();
-						batch.put(db::COL_EXTRA, b"first", hash.as_bytes());
+						batch.put(db::COL_EXTRA, b"first", &hash);
 						db.key_value().write(batch).expect("Low level database error when writing 'first' block. Some issue with disk?");
 						bc.first_block = Some(hash);
 					}
@@ -652,7 +652,10 @@ impl BlockChain {
 			// and write them
 			if let (Some(hash), Some(number)) = (best_ancient, best_ancient_number) {
 				let mut best_ancient_block = bc.best_ancient_block.write();
-				*best_ancient_block = Some(BestAncientBlock { hash, number });
+				*best_ancient_block = Some(BestAncientBlock {
+					hash: hash,
+					number: number,
+				});
 			}
 		}

@@ -755,8 +758,8 @@ impl BlockChain {
 		Some(TreeRoute {
 			blocks: from_branch,
 			ancestor: current_from,
-			index,
-			is_from_route_finalized,
+			index: index,
+			is_from_route_finalized: is_from_route_finalized,
 		})
 	}

@@ -785,8 +788,8 @@ impl BlockChain {
 		let compressed_body = compress(&Self::block_to_body(block.raw()), blocks_swapper());

 		// store block in db
-		batch.put(db::COL_HEADERS, hash.as_bytes(), &compressed_header);
-		batch.put(db::COL_BODIES, hash.as_bytes(), &compressed_body);
+		batch.put(db::COL_HEADERS, &hash, &compressed_header);
+		batch.put(db::COL_BODIES, &hash, &compressed_body);

 		let maybe_parent = self.block_details(&block_parent_hash);

@@ -929,7 +932,7 @@ impl BlockChain {
 			*pending_best_ancient_block = Some(None);
 		} else if block_number > ancient_number {
 			trace!(target: "blockchain", "Updating the best ancient block to {}.", block_number);
-			batch.put(db::COL_EXTRA, b"ancient", block_hash.as_bytes());
+			batch.put(db::COL_EXTRA, b"ancient", &block_hash);
 			*pending_best_ancient_block = Some(Some(BestAncientBlock {
 				hash: *block_hash,
 				number: block_number,
@@ -960,7 +963,6 @@ impl BlockChain {
 	/// Iterate over all epoch transitions.
 	/// This will only return transitions within the canonical chain.
 	pub fn epoch_transitions(&self) -> EpochTransitionIter {
-		debug!(target: "blockchain", "Iterating over all epoch transitions");
 		let iter = self.db.key_value().iter_from_prefix(db::COL_EXTRA, &EPOCH_KEY_PREFIX[..]);
 		EpochTransitionIter {
 			chain: self,
@@ -986,9 +988,7 @@ impl BlockChain {
 	pub fn epoch_transition_for(&self, parent_hash: H256) -> Option<EpochTransition> {
 		// slow path: loop back block by block
 		for hash in self.ancestry_iter(parent_hash)? {
-			trace!(target: "blockchain", "Got parent hash {} from ancestry_iter", hash);
 			let details = self.block_details(&hash)?;
-			trace!(target: "blockchain", "Block #{}: Got block details for parent hash {}", details.number, hash);

 			// look for transition in database.
 			if let Some(transition) = self.epoch_transition(details.number, hash) {
@@ -1000,22 +1000,11 @@ impl BlockChain {
 			//
 			// if `block_hash` is canonical it will only return transitions up to
 			// the parent.
-			match self.block_hash(details.number) {
-				Some(h) if h == hash => {
-					return self.epoch_transitions()
-						.map(|(_, t)| t)
-						.take_while(|t| t.block_number <= details.number)
-						.last()
-				},
-				Some(h) => {
-					warn!(target: "blockchain", "Block #{}: Found non-canonical block hash {} (expected {})", details.number, h, hash);
-
-					trace!(target: "blockchain", "Block #{} Mismatched hashes. Ancestor {} != Own {}", details.number, hash, h);
-					trace!(target: "blockchain", "      Ancestor {}: #{:#?}", hash, details);
-					trace!(target: "blockchain", "      Own      {}: #{:#?}", h, self.block_details(&h));
-
-				},
-				None => trace!(target: "blockchain", "Block #{}: hash {} not found in cache or DB", details.number, hash),
+			if self.block_hash(details.number)? == hash {
+				return self.epoch_transitions()
+					.map(|(_, t)| t)
+					.take_while(|t| t.block_number <= details.number)
+					.last()
 			}
 		}

@@ -1083,8 +1072,8 @@ impl BlockChain {
 		let compressed_body = compress(&Self::block_to_body(block.raw()), blocks_swapper());

 		// store block in db
-		batch.put(db::COL_HEADERS, hash.as_bytes(), &compressed_header);
-		batch.put(db::COL_BODIES, hash.as_bytes(), &compressed_body);
+		batch.put(db::COL_HEADERS, &hash, &compressed_header);
+		batch.put(db::COL_BODIES, &hash, &compressed_body);

 		let info = self.block_info(&block.header_view(), route, &extras);

@@ -1183,7 +1172,7 @@ impl BlockChain {
 		{
 			let mut best_block = self.pending_best_block.write();
 			if is_best && update.info.location != BlockLocation::Branch {
-				batch.put(db::COL_EXTRA, b"best", update.info.hash.as_bytes());
+				batch.put(db::COL_EXTRA, b"best", &update.info.hash);
 				*best_block = Some(BestBlock {
 					total_difficulty: update.info.total_difficulty,
 					header: update.block.decode_header(),
@@ -1270,7 +1259,7 @@ impl BlockChain {
 			current: if self.is_known(&first) {
 				first
 			} else {
-				H256::zero() // zero hash
+				H256::default() // zero hash
 			},
 			chain: self
 		}
@@ -1486,12 +1475,11 @@ impl BlockChain {

 	/// Get current cache size.
 	pub fn cache_size(&self) -> CacheSize {
-		let mut ops = new_malloc_size_ops();
 		CacheSize {
-			blocks: self.block_headers.size_of(&mut ops) + self.block_bodies.size_of(&mut ops),
-			block_details: self.block_details.size_of(&mut ops),
-			transaction_addresses: self.transaction_addresses.size_of(&mut ops),
-			block_receipts: self.block_receipts.size_of(&mut ops),
+			blocks: self.block_headers.read().heap_size_of_children() + self.block_bodies.read().heap_size_of_children(),
+			block_details: self.block_details.read().heap_size_of_children(),
+			transaction_addresses: self.transaction_addresses.read().heap_size_of_children(),
+			block_receipts: self.block_receipts.read().heap_size_of_children(),
 		}
 	}

@@ -1526,13 +1514,12 @@ impl BlockChain {
 			transaction_addresses.shrink_to_fit();
 			block_receipts.shrink_to_fit();

-			let mut ops = new_malloc_size_ops();
-			block_headers.size_of(&mut ops) +
-			block_bodies.size_of(&mut ops) +
-			block_details.size_of(&mut ops) +
-			block_hashes.size_of(&mut ops) +
-			transaction_addresses.size_of(&mut ops) +
-			block_receipts.size_of(&mut ops)
+			block_headers.heap_size_of_children() +
+			block_bodies.heap_size_of_children() +
+			block_details.heap_size_of_children() +
+			block_hashes.heap_size_of_children() +
+			transaction_addresses.heap_size_of_children() +
+			block_receipts.heap_size_of_children()
 		});
 	}

@@ -1584,18 +1571,17 @@ mod tests {
 	use keccak_hash::keccak;
 	use rustc_hex::FromHex;
 	use tempdir::TempDir;
-	use std::str::FromStr;

 	struct TestBlockChainDB {
 		_blooms_dir: TempDir,
 		_trace_blooms_dir: TempDir,
 		blooms: blooms_db::Database,
 		trace_blooms: blooms_db::Database,
-		key_value: Arc<dyn KeyValueDB>,
+		key_value: Arc<KeyValueDB>,
 	}

 	impl BlockChainDB for TestBlockChainDB {
-		fn key_value(&self) -> &Arc<dyn KeyValueDB> {
+		fn key_value(&self) -> &Arc<KeyValueDB> {
 			&self.key_value
 		}

@@ -1609,7 +1595,7 @@ mod tests {
 	}

 	/// Creates new test instance of `BlockChainDB`
-	pub fn new_db() -> Arc<dyn BlockChainDB> {
+	pub fn new_db() -> Arc<BlockChainDB> {
 		let blooms_dir = TempDir::new("").unwrap();
 		let trace_blooms_dir = TempDir::new("").unwrap();

@@ -1624,15 +1610,15 @@ mod tests {
 		Arc::new(db)
 	}

-	fn new_chain(genesis: encoded::Block, db: Arc<dyn BlockChainDB>) -> BlockChain {
+	fn new_chain(genesis: encoded::Block, db: Arc<BlockChainDB>) -> BlockChain {
 		BlockChain::new(Config::default(), genesis.raw(), db)
 	}

-	fn insert_block(db: &Arc<dyn BlockChainDB>, bc: &BlockChain, block: encoded::Block, receipts: Vec<Receipt>) -> ImportRoute {
+	fn insert_block(db: &Arc<BlockChainDB>, bc: &BlockChain, block: encoded::Block, receipts: Vec<Receipt>) -> ImportRoute {
 		insert_block_commit(db, bc, block, receipts, true)
 	}

-	fn insert_block_commit(db: &Arc<dyn BlockChainDB>, bc: &BlockChain, block: encoded::Block, receipts: Vec<Receipt>, commit: bool) -> ImportRoute {
+	fn insert_block_commit(db: &Arc<BlockChainDB>, bc: &BlockChain, block: encoded::Block, receipts: Vec<Receipt>, commit: bool) -> ImportRoute {
 		let mut batch = db.key_value().transaction();
 		let res = insert_block_batch(&mut batch, bc, block, receipts);
 		db.key_value().write(batch).unwrap();
@@ -1643,6 +1629,8 @@ mod tests {
 	}

 	fn insert_block_batch(batch: &mut DBTransaction, bc: &BlockChain, block: encoded::Block, receipts: Vec<Receipt>) -> ImportRoute {
+		use crate::ExtrasInsert;
+
 		let fork_choice = {
 			let header = block.header_view();
 			let parent_hash = header.parent_hash();
@@ -2069,7 +2057,7 @@ mod tests {
 	fn find_transaction_by_hash() {
 		let genesis = "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".from_hex().unwrap();
 		let b1 = "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".from_hex().unwrap();
-		let b1_hash = H256::from_str("f53f268d23a71e85c7d6d83a9504298712b84c1a2ba220441c86eeda0bf0b6e3").unwrap();
+		let b1_hash: H256 = "f53f268d23a71e85c7d6d83a9504298712b84c1a2ba220441c86eeda0bf0b6e3".into();

 		let db = new_db();
 		let bc = new_chain(encoded::Block::new(genesis), db.clone());
@@ -2142,7 +2130,7 @@ mod tests {
 		let db = new_db();
 		let bc = new_chain(genesis.last().encoded(), db.clone());
 		insert_block(&db, &bc, b1.last().encoded(), vec![Receipt {
-			outcome: TransactionOutcome::StateRoot(H256::zero()),
+			outcome: TransactionOutcome::StateRoot(H256::default()),
 			gas_used: 10_000.into(),
 			log_bloom: Default::default(),
 			logs: vec![
@@ -2151,7 +2139,7 @@ mod tests {
 			],
 		},
 		Receipt {
-			outcome: TransactionOutcome::StateRoot(H256::zero()),
+			outcome: TransactionOutcome::StateRoot(H256::default()),
 			gas_used: 10_000.into(),
 			log_bloom: Default::default(),
 			logs: vec![
@@ -2160,7 +2148,7 @@ mod tests {
 		}]);
 		insert_block(&db, &bc, b2.last().encoded(), vec![
 			Receipt {
-				outcome: TransactionOutcome::StateRoot(H256::zero()),
+				outcome: TransactionOutcome::StateRoot(H256::default()),
 				gas_used: 10_000.into(),
 				log_bloom: Default::default(),
 				logs: vec![
@@ -2170,7 +2158,7 @@ mod tests {
 		]);
 		insert_block(&db, &bc, b3.last().encoded(), vec![
 			Receipt {
-				outcome: TransactionOutcome::StateRoot(H256::zero()),
+				outcome: TransactionOutcome::StateRoot(H256::default()),
 				gas_used: 10_000.into(),
 				log_bloom: Default::default(),
 				logs: vec![
@@ -2249,11 +2237,11 @@ mod tests {

 	#[test]
 	fn test_bloom_filter_simple() {
-		let bloom_b1 = Bloom::from_str("00000020000000000000000000000000000000000000000002000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000400000000000000000000002000").unwrap();
+		let bloom_b1: Bloom = "00000020000000000000000000000000000000000000000002000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000400000000000000000000002000".into();

-		let bloom_b2 = Bloom::from_str("00000000000000000000000000000000000000000000020000001000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let bloom_b2: Bloom = "00000000000000000000000000000000000000000000020000001000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();

-		let bloom_ba = Bloom::from_str("00000000000000000000000000000000000000000000020000000800000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let bloom_ba: Bloom = "00000000000000000000000000000000000000000000020000000800000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();

 		let genesis = BlockBuilder::genesis();
 		let b1 = genesis.add_block_with(|| BlockOptions {
@@ -2317,11 +2305,11 @@ mod tests {

 	#[test]
 	fn test_insert_unordered() {
-		let bloom_b1 = Bloom::from_str("00000020000000000000000000000000000000000000000002000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000400000000000000000000002000").unwrap();
+		let bloom_b1: Bloom = "00000020000000000000000000000000000000000000000002000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000400000000000000000000002000".into();

-		let bloom_b2 = Bloom::from_str("00000000000000000000000000000000000000000000020000001000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let bloom_b2: Bloom = "00000000000000000000000000000000000000000000020000001000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();

-		let bloom_b3 = Bloom::from_str("00000000000000000000000000000000000000000000020000000800000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let bloom_b3: Bloom = "00000000000000000000000000000000000000000000020000000800000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();

 		let genesis = BlockBuilder::genesis();
 		let b1 = genesis.add_block_with_bloom(bloom_b1);
--- a/ethcore/blockchain/src/import_route.rs
+++ b/ethcore/blockchain/src/import_route.rs
@@ -68,7 +68,7 @@ impl From<BlockInfo> for ImportRoute {

 #[cfg(test)]
 mod tests {
-	use ethereum_types::{U256, BigEndianHash};
+	use ethereum_types::{H256, U256};
 	use crate::block_info::{BlockInfo, BlockLocation, BranchBecomingCanonChainData};
 	use super::ImportRoute;

@@ -84,7 +84,7 @@ mod tests {
 	#[test]
 	fn import_route_branch() {
 		let info = BlockInfo {
-			hash: BigEndianHash::from_uint(&U256::from(1)),
+			hash: H256::from(U256::from(1)),
 			number: 0,
 			total_difficulty: U256::from(0),
 			location: BlockLocation::Branch,
@@ -93,14 +93,14 @@ mod tests {
 		assert_eq!(ImportRoute::from(info), ImportRoute {
 			retracted: vec![],
 			enacted: vec![],
-			omitted: vec![BigEndianHash::from_uint(&U256::from(1))],
+			omitted: vec![H256::from(U256::from(1))],
 		});
 	}

 	#[test]
 	fn import_route_canon_chain() {
 		let info = BlockInfo {
-			hash: BigEndianHash::from_uint(&U256::from(1)),
+			hash: H256::from(U256::from(1)),
 			number: 0,
 			total_difficulty: U256::from(0),
 			location: BlockLocation::CanonChain,
@@ -108,7 +108,7 @@ mod tests {

 		assert_eq!(ImportRoute::from(info), ImportRoute {
 			retracted: vec![],
-			enacted: vec![BigEndianHash::from_uint(&U256::from(1))],
+			enacted: vec![H256::from(U256::from(1))],
 			omitted: vec![],
 		});
 	}
@@ -116,19 +116,19 @@ mod tests {
 	#[test]
 	fn import_route_branch_becoming_canon_chain() {
 		let info = BlockInfo {
-			hash: BigEndianHash::from_uint(&U256::from(2)),
+			hash: H256::from(U256::from(2)),
 			number: 0,
 			total_difficulty: U256::from(0),
 			location: BlockLocation::BranchBecomingCanonChain(BranchBecomingCanonChainData {
-				ancestor: BigEndianHash::from_uint(&U256::from(0)),
-				enacted: vec![BigEndianHash::from_uint(&U256::from(1))],
-				retracted: vec![BigEndianHash::from_uint(&U256::from(3)), BigEndianHash::from_uint(&U256::from(4))],
+				ancestor: H256::from(U256::from(0)),
+				enacted: vec![H256::from(U256::from(1))],
+				retracted: vec![H256::from(U256::from(3)), H256::from(U256::from(4))],
 			})
 		};

 		assert_eq!(ImportRoute::from(info), ImportRoute {
-			retracted: vec![BigEndianHash::from_uint(&U256::from(3)), BigEndianHash::from_uint(&U256::from(4))],
-			enacted: vec![BigEndianHash::from_uint(&U256::from(1)), BigEndianHash::from_uint(&U256::from(2))],
+			retracted: vec![H256::from(U256::from(3)), H256::from(U256::from(4))],
+			enacted: vec![H256::from(U256::from(1)), H256::from(U256::from(2))],
 			omitted: vec![],
 		});
 	}
--- a/ethcore/blockchain/src/lib.rs
+++ b/ethcore/blockchain/src/lib.rs
@@ -18,9 +18,6 @@

 #![warn(missing_docs)]

-extern crate parity_util_mem as util_mem;
-extern crate parity_util_mem as malloc_size_of;
-
 mod best_block;
 mod block_info;
 mod blockchain;
--- a/ethcore/call-contract/Cargo.toml
+++ b/ethcore/call-contract/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum (EthCore) Contract Calls and Blockchain Service & Registry Information"
 name = "ethcore-call-contract"
 version = "0.1.0"
 license = "GPL-3.0"
@@ -8,5 +7,5 @@ edition = "2018"

 [dependencies]
 types = { path = "../types", package = "common-types" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 bytes = { version = "0.1", package = "parity-bytes" }
--- a/ethcore/db/Cargo.toml
+++ b/ethcore/db/Cargo.toml
@@ -9,9 +9,9 @@ edition = "2018"

 [dependencies]
 common-types = { path = "../types" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
+heapsize = "0.4"
 kvdb = "0.1"
-parity-util-mem = "0.1"
 parking_lot = "0.7"
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 rlp_derive = { path = "../../util/rlp-derive" }
--- a/ethcore/db/src/db.rs
+++ b/ethcore/db/src/db.rs
@@ -16,7 +16,7 @@

 //! Database utilities and definitions.

-use std::convert::AsRef;
+use std::ops::Deref;
 use std::hash::Hash;
 use std::collections::HashMap;
 use parking_lot::RwLock;
@@ -82,7 +82,7 @@ impl<K, V> Cache<K, V> for HashMap<K, V> where K: Hash + Eq {
 /// Should be used to get database key associated with given value.
 pub trait Key<T> {
 	/// The db key associated with this value.
-	type Target: AsRef<[u8]>;
+	type Target: Deref<Target = [u8]>;

 	/// Returns db key.
 	fn key(&self) -> Self::Target;
@@ -91,16 +91,16 @@ pub trait Key<T> {
 /// Should be used to write value into database.
 pub trait Writable {
 	/// Writes the value into the database.
-	fn write<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>, value: &T) where T: rlp::Encodable, R: AsRef<[u8]>;
+	fn write<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>, value: &T) where T: rlp::Encodable, R: Deref<Target = [u8]>;

 	/// Deletes key from the databse.
-	fn delete<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>) where T: rlp::Encodable, R: AsRef<[u8]>;
+	fn delete<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>) where T: rlp::Encodable, R: Deref<Target = [u8]>;

 	/// Writes the value into the database and updates the cache.
 	fn write_with_cache<K, T, R>(&mut self, col: Option<u32>, cache: &mut Cache<K, T>, key: K, value: T, policy: CacheUpdatePolicy) where
 	K: Key<T, Target = R> + Hash + Eq,
 	T: rlp::Encodable,
-	R: AsRef<[u8]> {
+	R: Deref<Target = [u8]> {
 		self.write(col, &key, &value);
 		match policy {
 			CacheUpdatePolicy::Overwrite => {
@@ -116,7 +116,7 @@ pub trait Writable {
 	fn extend_with_cache<K, T, R>(&mut self, col: Option<u32>, cache: &mut Cache<K, T>, values: HashMap<K, T>, policy: CacheUpdatePolicy) where
 	K: Key<T, Target = R> + Hash + Eq,
 	T: rlp::Encodable,
-	R: AsRef<[u8]> {
+	R: Deref<Target = [u8]> {
 		match policy {
 			CacheUpdatePolicy::Overwrite => {
 				for (key, value) in values {
@@ -137,7 +137,7 @@ pub trait Writable {
 	fn extend_with_option_cache<K, T, R>(&mut self, col: Option<u32>, cache: &mut Cache<K, Option<T>>, values: HashMap<K, Option<T>>, policy: CacheUpdatePolicy) where
 	K: Key<T, Target = R> + Hash + Eq,
 	T: rlp::Encodable,
-	R: AsRef<[u8]> {
+	R: Deref<Target = [u8]> {
 		match policy {
 			CacheUpdatePolicy::Overwrite => {
 				for (key, value) in values {
@@ -167,7 +167,7 @@ pub trait Readable {
 	/// Returns value for given key.
 	fn read<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> Option<T> where
 	T: rlp::Decodable,
-	R: AsRef<[u8]>;
+	R: Deref<Target = [u8]>;

 	/// Returns value for given key either in cache or in database.
 	fn read_with_cache<K, T, C>(&self, col: Option<u32>, cache: &RwLock<C>, key: &K) -> Option<T> where
@@ -189,12 +189,12 @@ pub trait Readable {
 	}

 	/// Returns true if given value exists.
-	fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> bool where R: AsRef<[u8]>;
+	fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> bool where R: Deref<Target= [u8]>;

 	/// Returns true if given value exists either in cache or in database.
 	fn exists_with_cache<K, T, R, C>(&self, col: Option<u32>, cache: &RwLock<C>, key: &K) -> bool where
 	K: Eq + Hash + Key<T, Target = R>,
-	R: AsRef<[u8]>,
+	R: Deref<Target = [u8]>,
 	C: Cache<K, T> {
 		{
 			let read = cache.read();
@@ -208,31 +208,31 @@ pub trait Readable {
 }

 impl Writable for DBTransaction {
-	fn write<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>, value: &T) where T: rlp::Encodable, R: AsRef<[u8]> {
-		self.put(col, key.key().as_ref(), &rlp::encode(value));
+	fn write<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>, value: &T) where T: rlp::Encodable, R: Deref<Target = [u8]> {
+		self.put(col, &key.key(), &rlp::encode(value));
 	}

-	fn delete<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>) where T: rlp::Encodable, R: AsRef<[u8]> {
-		self.delete(col, key.key().as_ref());
+	fn delete<T, R>(&mut self, col: Option<u32>, key: &Key<T, Target = R>) where T: rlp::Encodable, R: Deref<Target = [u8]> {
+		self.delete(col, &key.key());
 	}
 }

 impl<KVDB: KeyValueDB + ?Sized> Readable for KVDB {
 	fn read<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> Option<T>
-		where T: rlp::Decodable, R: AsRef<[u8]> {
-		self.get(col, key.key().as_ref())
-			.expect(&format!("db get failed, key: {:?}", key.key().as_ref()))
+		where T: rlp::Decodable, R: Deref<Target = [u8]> {
+		self.get(col, &key.key())
+			.expect(&format!("db get failed, key: {:?}", &key.key() as &[u8]))
 			.map(|v| rlp::decode(&v).expect("decode db value failed") )

 	}

-	fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> bool where R: AsRef<[u8]> {
-		let result = self.get(col, key.key().as_ref());
+	fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> bool where R: Deref<Target = [u8]> {
+		let result = self.get(col, &key.key());

 		match result {
 			Ok(v) => v.is_some(),
 			Err(err) => {
-				panic!("db get failed, key: {:?}, err: {:?}", key.key().as_ref(), err);
+				panic!("db get failed, key: {:?}, err: {:?}", &key.key() as &[u8], err);
 			}
 		}
 	}
--- a/ethcore/db/src/keys.rs
+++ b/ethcore/db/src/keys.rs
@@ -17,13 +17,13 @@
 //! Blockchain DB extras.

 use std::io::Write;
-use std::convert::AsRef;
+use std::ops;

 use common_types::BlockNumber;
 use common_types::engines::epoch::Transition as EpochTransition;
 use common_types::receipt::Receipt;
 use ethereum_types::{H256, H264, U256};
-use parity_util_mem::MallocSizeOf;
+use heapsize::HeapSizeOf;
 use kvdb::PREFIX_LEN as DB_PREFIX_LEN;
 use rlp;
 use rlp_derive::{RlpEncodableWrapper, RlpDecodableWrapper, RlpEncodable, RlpDecodable};
@@ -49,17 +49,19 @@ pub enum ExtrasIndex {

 fn with_index(hash: &H256, i: ExtrasIndex) -> H264 {
 	let mut result = H264::default();
-	result.as_bytes_mut()[0] = i as u8;
-	result.as_bytes_mut()[1..].clone_from_slice(hash.as_bytes());
+	result[0] = i as u8;
+	(*result)[1..].clone_from_slice(hash);
 	result
 }

 /// Wrapper for block number used as a DB key.
 pub struct BlockNumberKey([u8; 5]);

-impl AsRef<[u8]> for BlockNumberKey {
-	fn as_ref(&self) -> &[u8] {
-		&self.0[..]
+impl ops::Deref for BlockNumberKey {
+	type Target = [u8];
+
+	fn deref(&self) -> &Self::Target {
+		&self.0
 	}
 }

@@ -121,8 +123,10 @@ pub const EPOCH_KEY_PREFIX: &'static [u8; DB_PREFIX_LEN] = &[
 /// Epoch transitions key
 pub struct EpochTransitionsKey([u8; EPOCH_KEY_LEN]);

-impl AsRef<[u8]> for EpochTransitionsKey {
-	fn as_ref(&self) -> &[u8] { &self.0[..] }
+impl ops::Deref for EpochTransitionsKey {
+	type Target = [u8];
+
+	fn deref(&self) -> &[u8] { &self.0[..] }
 }

 impl Key<EpochTransitions> for u64 {
@@ -140,7 +144,7 @@ impl Key<EpochTransitions> for u64 {
 }

 /// Familial details concerning a block
-#[derive(Debug, Clone, MallocSizeOf)]
+#[derive(Debug, Clone)]
 pub struct BlockDetails {
 	/// Block number
 	pub number: BlockNumber,
@@ -195,8 +199,14 @@ impl rlp::Decodable for BlockDetails {
 	}
 }

+impl HeapSizeOf for BlockDetails {
+	fn heap_size_of_children(&self) -> usize {
+		self.children.heap_size_of_children()
+	}
+}
+
 /// Represents address of certain transaction within block
-#[derive(Debug, PartialEq, Clone, RlpEncodable, RlpDecodable, MallocSizeOf)]
+#[derive(Debug, PartialEq, Clone, RlpEncodable, RlpDecodable)]
 pub struct TransactionAddress {
 	/// Block hash
 	pub block_hash: H256,
@@ -204,8 +214,12 @@ pub struct TransactionAddress {
 	pub index: usize
 }

+impl HeapSizeOf for TransactionAddress {
+	fn heap_size_of_children(&self) -> usize { 0 }
+}
+
 /// Contains all block receipts.
-#[derive(Debug, Clone, RlpEncodableWrapper, RlpDecodableWrapper, MallocSizeOf)]
+#[derive(Clone, RlpEncodableWrapper, RlpDecodableWrapper)]
 pub struct BlockReceipts {
 	/// Block receipts
 	pub receipts: Vec<Receipt>,
@@ -214,7 +228,15 @@ pub struct BlockReceipts {
 impl BlockReceipts {
 	/// Create new block receipts wrapper.
 	pub fn new(receipts: Vec<Receipt>) -> Self {
-		BlockReceipts { receipts }
+		BlockReceipts {
+			receipts: receipts
+		}
+	}
+}
+
+impl HeapSizeOf for BlockReceipts {
+	fn heap_size_of_children(&self) -> usize {
+		self.receipts.heap_size_of_children()
 	}
 }

--- a/ethcore/db/src/lib.rs
+++ b/ethcore/db/src/lib.rs
@@ -18,9 +18,6 @@

 #![warn(missing_docs)]

-extern crate parity_util_mem as mem;
-extern crate parity_util_mem as malloc_size_of;
-
 mod db;

 pub mod keys;
--- a/ethcore/evm/Cargo.toml
+++ b/ethcore/evm/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-description = "Parity Ethereum Virtual Machine (EVM) Rust Implementation"
 name = "evm"
 version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
@@ -7,14 +6,15 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 bit-set = "0.4"
 parity-bytes = "0.1"
-ethereum-types = "0.6.0"
-parity-util-mem = "0.1"
+ethereum-types = "0.4"
+heapsize = "0.4"
 lazy_static = "1.0"
 log = "0.4"
 vm = { path = "../vm" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
 parking_lot = "0.7"
 memory-cache = { path = "../../util/memory-cache" }
+num-bigint = "0.2"

 [dev-dependencies]
 rustc-hex = "1.0"
--- a/ethcore/evm/benches/basic.rs
+++ b/ethcore/evm/benches/basic.rs
@@ -21,7 +21,7 @@ extern crate criterion;
 extern crate bit_set;
 extern crate ethereum_types;
 extern crate parking_lot;
-extern crate parity_util_mem as mem;
+extern crate heapsize;
 extern crate vm;
 extern crate evm;
 extern crate keccak_hash as hash;
--- a/ethcore/evm/src/interpreter/gasometer.rs
+++ b/ethcore/evm/src/interpreter/gasometer.rs
@@ -15,7 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

 use std::cmp;
-use ethereum_types::{BigEndianHash, U256};
+use ethereum_types::{U256, H256};
 use super::u256_to_address;

 use {evm, vm};
@@ -121,12 +121,12 @@ impl<Gas: evm::CostType> Gasometer<Gas> {
 				Request::Gas(Gas::from(1))
 			},
 			instructions::SSTORE => {
-				let address = BigEndianHash::from_uint(stack.peek(0));
+				let address = H256::from(stack.peek(0));
 				let newval = stack.peek(1);
-				let val = ext.storage_at(&address)?.into_uint();
+				let val = U256::from(&*ext.storage_at(&address)?);

 				let gas = if schedule.eip1283 {
-					let orig = ext.initial_storage_at(&address)?.into_uint();
+					let orig = U256::from(&*ext.initial_storage_at(&address)?);
 					calculate_eip1283_sstore_gas(schedule, &orig, &val, &newval)
 				} else {
 					if val.is_zero() && !newval.is_zero() {
--- a/ethcore/evm/src/interpreter/mod.rs
+++ b/ethcore/evm/src/interpreter/mod.rs
@@ -26,11 +26,10 @@ mod shared_cache;
 use std::marker::PhantomData;
 use std::{cmp, mem};
 use std::sync::Arc;
-use std::convert::TryFrom;
 use hash::keccak;
 use bytes::Bytes;
-use ethereum_types::{U256, U512, H256, Address, BigEndianHash};
-
+use ethereum_types::{U256, H256, Address};
+use num_bigint::BigUint;

 use vm::{
 	self, ActionParams, ParamsType, ActionValue, CallType, MessageCallResult,
@@ -63,6 +62,17 @@ const TWO_POW_96: U256 = U256([0, 0x100000000, 0, 0]); //0x1 00000000 00000000 0
 const TWO_POW_224: U256 = U256([0, 0, 0, 0x100000000]); //0x1 00000000 00000000 00000000 00000000 00000000 00000000 00000000
 const TWO_POW_248: U256 = U256([0, 0, 0, 0x100000000000000]); //0x1 00000000 00000000 00000000 00000000 00000000 00000000 00000000 000000

+fn to_biguint(x: U256) -> BigUint {
+	let mut bytes = [0u8; 32];
+	x.to_little_endian(&mut bytes);
+	BigUint::from_bytes_le(&bytes)
+}
+
+fn from_biguint(x: BigUint) -> U256 {
+	let bytes = x.to_bytes_le();
+	U256::from_little_endian(&bytes)
+}
+
 /// Abstraction over raw vector of Bytes. Easier state management of PC.
 struct CodeReader {
 	position: ProgramCounter,
@@ -510,7 +520,7 @@ 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(self.stack.pop_back().into()),
 					_ => unreachable!("instruction can only be CREATE/CREATE2 checked above; qed"),
 				};

@@ -667,7 +677,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 				let size = self.stack.pop_back();
 				let topics = self.stack.pop_n(no_of_topics)
 					.iter()
-					.map(BigEndianHash::from_uint)
+					.map(H256::from)
 					.collect();
 				ext.log(topics, self.mem.read_slice(offset, size))?;
 			},
@@ -704,21 +714,21 @@ impl<Cost: CostType> Interpreter<Cost> {
 				let offset = self.stack.pop_back();
 				let size = self.stack.pop_back();
 				let k = keccak(self.mem.read_slice(offset, size));
-				self.stack.push(k.into_uint());
+				self.stack.push(U256::from(&*k));
 			},
 			instructions::SLOAD => {
-				let key = BigEndianHash::from_uint(&self.stack.pop_back());
-				let word = ext.storage_at(&key)?.into_uint();
+				let key = H256::from(&self.stack.pop_back());
+				let word = U256::from(&*ext.storage_at(&key)?);
 				self.stack.push(word);
 			},
 			instructions::SSTORE => {
-				let address = BigEndianHash::from_uint(&self.stack.pop_back());
+				let address = H256::from(&self.stack.pop_back());
 				let val = self.stack.pop_back();

-				let current_val = ext.storage_at(&address)?.into_uint();
+				let current_val = U256::from(&*ext.storage_at(&address)?);
 				// Increase refund for clear
 				if ext.schedule().eip1283 {
-					let original_val = ext.initial_storage_at(&address)?.into_uint();
+					let original_val = U256::from(&*ext.initial_storage_at(&address)?);
 					gasometer::handle_eip1283_sstore_clears_refund(ext, &original_val, &current_val, &val);
 				} else {
 					if !current_val.is_zero() && val.is_zero() {
@@ -726,7 +736,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 						ext.add_sstore_refund(sstore_clears_schedule);
 					}
 				}
-				ext.set_storage(address, BigEndianHash::from_uint(&val))?;
+				ext.set_storage(address, H256::from(&val))?;
 			},
 			instructions::PC => {
 				self.stack.push(U256::from(self.reader.position - 1));
@@ -787,7 +797,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 			instructions::EXTCODEHASH => {
 				let address = u256_to_address(&self.stack.pop_back());
 				let hash = ext.extcodehash(&address)?.unwrap_or_else(H256::zero);
-				self.stack.push(hash.into_uint());
+				self.stack.push(U256::from(hash));
 			},
 			instructions::CALLDATACOPY => {
 				Self::copy_data_to_memory(&mut self.mem, &mut self.stack, &self.params.data.as_ref().map_or_else(|| &[] as &[u8], |d| &*d as &[u8]));
@@ -821,7 +831,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 			instructions::BLOCKHASH => {
 				let block_number = self.stack.pop_back();
 				let block_hash = ext.blockhash(&block_number);
-				self.stack.push(block_hash.into_uint());
+				self.stack.push(U256::from(&*block_hash));
 			},
 			instructions::COINBASE => {
 				self.stack.push(address_to_u256(ext.env_info().author.clone()));
@@ -1011,12 +1021,12 @@ impl<Cost: CostType> Interpreter<Cost> {
 				let c = self.stack.pop_back();

 				self.stack.push(if !c.is_zero() {
-					let a_512 = U512::from(a);
-					let b_512 = U512::from(b);
-					let c_512 = U512::from(c);
-					let res = a_512 + b_512;
-					let x = res % c_512;
-					U256::try_from(x).expect("U512 % U256 fits U256; qed")
+					let a_num = to_biguint(a);
+					let b_num = to_biguint(b);
+					let c_num = to_biguint(c);
+					let res = a_num + b_num;
+					let x = res % c_num;
+					from_biguint(x)
 				} else {
 					U256::zero()
 				});
@@ -1027,12 +1037,12 @@ impl<Cost: CostType> Interpreter<Cost> {
 				let c = self.stack.pop_back();

 				self.stack.push(if !c.is_zero() {
-					let a_512 = U512::from(a);
-					let b_512 = U512::from(b);
-					let c_512 = U512::from(c);
-					let res = a_512 * b_512;
-					let x = res % c_512;
-					U256::try_from(x).expect("U512 % U256 fits U256; qed")
+					let a_num = to_biguint(a);
+					let b_num = to_biguint(b);
+					let c_num = to_biguint(c);
+					let res = a_num * b_num;
+					let x = res % c_num;
+					from_biguint(x)
 				} else {
 					U256::zero()
 				});
@@ -1172,13 +1182,12 @@ fn set_sign(value: U256, sign: bool) -> U256 {

 #[inline]
 fn u256_to_address(value: &U256) -> Address {
-	let addr: H256 = BigEndianHash::from_uint(value);
-	Address::from(addr)
+	Address::from(H256::from(value))
 }

 #[inline]
 fn address_to_u256(value: Address) -> U256 {
-	H256::from(value).into_uint()
+	U256::from(&*H256::from(value))
 }

 #[cfg(test)]
@@ -1189,7 +1198,6 @@ mod tests {
 	use factory::Factory;
 	use vm::{self, Exec, ActionParams, ActionValue};
 	use vm::tests::{FakeExt, test_finalize};
-	use ethereum_types::Address;

 	fn interpreter(params: ActionParams, ext: &vm::Ext) -> Box<Exec> {
 		Factory::new(VMType::Interpreter, 1).create(params, ext.schedule(), ext.depth())
@@ -1200,13 +1208,13 @@ mod tests {
 		let code = "7feeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff006000527faaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffaa6020526000620f120660406000601773945304eb96065b2a98b57a48a06ae28d285a71b56101f4f1600055".from_hex().unwrap();

 		let mut params = ActionParams::default();
-		params.address = Address::from_low_u64_be(5);
+		params.address = 5.into();
 		params.gas = 300_000.into();
 		params.gas_price = 1.into();
 		params.value = ActionValue::Transfer(100_000.into());
 		params.code = Some(Arc::new(code));
 		let mut ext = FakeExt::new();
-		ext.balances.insert(Address::from_low_u64_be(5), 1_000_000_000.into());
+		ext.balances.insert(5.into(), 1_000_000_000.into());
 		ext.tracing = true;

 		let gas_left = {
@@ -1223,12 +1231,12 @@ mod tests {
 		let code = "6001600160000360003e00".from_hex().unwrap();

 		let mut params = ActionParams::default();
-		params.address = Address::from_low_u64_be(5);
+		params.address = 5.into();
 		params.gas = 300_000.into();
 		params.gas_price = 1.into();
 		params.code = Some(Arc::new(code));
 		let mut ext = FakeExt::new_byzantium();
-		ext.balances.insert(Address::from_low_u64_be(5), 1_000_000_000.into());
+		ext.balances.insert(5.into(), 1_000_000_000.into());
 		ext.tracing = true;

 		let err = {
--- a/ethcore/evm/src/interpreter/shared_cache.rs
+++ b/ethcore/evm/src/interpreter/shared_cache.rs
@@ -16,7 +16,7 @@

 use std::sync::Arc;
 use hash::KECCAK_EMPTY;
-use parity_util_mem::{MallocSizeOf, MallocSizeOfOps};
+use heapsize::HeapSizeOf;
 use ethereum_types::H256;
 use parking_lot::Mutex;
 use memory_cache::MemoryLruCache;
@@ -25,12 +25,11 @@ use super::super::instructions::{self, Instruction};

 const DEFAULT_CACHE_SIZE: usize = 4 * 1024 * 1024;

-/// Stub for a sharing `BitSet` data in cache (reference counted)
-/// and implementing MallocSizeOf on it.
+// stub for a HeapSizeOf implementation.
 struct Bits(Arc<BitSet>);

-impl MallocSizeOf for Bits {
-	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+impl HeapSizeOf for Bits {
+	fn heap_size_of_children(&self) -> usize {
 		// dealing in bits here
 		self.0.capacity() * 8
 	}
--- a/ethcore/evm/src/lib.rs
+++ b/ethcore/evm/src/lib.rs
@@ -19,11 +19,12 @@
 extern crate bit_set;
 extern crate ethereum_types;
 extern crate parking_lot;
-extern crate parity_util_mem;
+extern crate heapsize;
 extern crate vm;
 extern crate keccak_hash as hash;
 extern crate memory_cache;
 extern crate parity_bytes as bytes;
+extern crate num_bigint;

 #[macro_use]
 extern crate lazy_static;
--- a/ethcore/evm/src/tests.rs
+++ b/ethcore/evm/src/tests.rs
@@ -239,7 +239,7 @@ fn test_blockhash(factory: super::Factory) {
 	};

 	assert_eq!(gas_left, U256::from(79_974));
-	assert_eq!(ext.store.get(&H256::zero()).unwrap(), &blockhash);
+	assert_eq!(ext.store.get(&H256::new()).unwrap(), &blockhash);
 }

 evm_test!{test_calldataload: test_calldataload_int}
@@ -726,8 +726,8 @@ evm_test!{test_calls: test_calls_int}
 fn test_calls(factory: super::Factory) {
 	let code = "600054602d57600160005560006000600060006050610998610100f160006000600060006050610998610100f25b".from_hex().unwrap();

-	let address = Address::from_low_u64_be(0x155);
-	let code_address = Address::from_low_u64_be(0x998);
+	let address = Address::from(0x155);
+	let code_address = Address::from(0x998);
 	let mut params = ActionParams::default();
 	params.gas = U256::from(150_000);
 	params.code = Some(Arc::new(code));
@@ -772,7 +772,7 @@ evm_test!{test_create_in_staticcall: test_create_in_staticcall_int}
 fn test_create_in_staticcall(factory: super::Factory) {
 	let code = "600060006064f000".from_hex().unwrap();

-	let address = Address::from_low_u64_be(0x155);
+	let address = Address::from(0x155);
 	let mut params = ActionParams::default();
 	params.gas = U256::from(100_000);
 	params.code = Some(Arc::new(code));
@@ -1066,5 +1066,5 @@ fn assert_set_contains<T : Debug + Eq + PartialEq + Hash>(set: &HashSet<T>, val:
 }

 fn assert_store(ext: &FakeExt, pos: u64, val: &str) {
-	assert_eq!(ext.store.get(&H256::from_low_u64_be(pos)).unwrap(), &H256::from_str(val).unwrap());
+	assert_eq!(ext.store.get(&H256::from(pos)).unwrap(), &H256::from_str(val).unwrap());
 }
--- a/ethcore/light/Cargo.toml
+++ b/ethcore/light/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-description = "Parity Ethereum (EthCore) Light Client Implementation (Block Import IO Service, Blockchain Data Fetching, Light Client Header Chain Storage, Parity Light Protocol (PLP) Provider, Light Transaction Queue, CHT Definitions, Light Client Data Cache), Parity Light Protocol (PLP) Implementation, P2P Network I/O and Event Context Generalization, Peer Error Handling & Punishment, Request Load Timer & Distribution Manager, Pending Request Set Storage, Request Credit Management, Light Client Request Types, Request Chain Builder Utility, On-demand Chain Request Service over LES (for RPCs), ResponseGuard Implementation)"
+description = "Parity Light Client Implementation"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "ethcore-light"
@@ -10,34 +10,32 @@ authors = ["Parity Technologies <admin@parity.io>"]
 log = "0.4"
 parity-bytes = "0.1"
 common-types = { path = "../types" }
-derive_more = "0.14.0"
 ethcore = { path = ".."}
 ethcore-db = { path = "../db" }
 ethcore-blockchain = { path = "../blockchain" }
-ethereum-types = "0.6.0"
-memory-db = "0.12.4"
-trie-db = "0.12.4"
+ethereum-types = "0.4"
+memory-db = "0.11.0"
+trie-db = "0.11.0"
 patricia-trie-ethereum = { path = "../../util/patricia-trie-ethereum" }
 ethcore-network = { path = "../../util/network" }
-ethcore-miner = { path = "../../miner" }
 ethcore-io = { path = "../../util/io" }
-hash-db = "0.12.4"
-parity-util-mem = "0.1"
+hash-db = "0.11.0"
+heapsize = "0.4"
 vm = { path = "../vm" }
 fastmap = { path = "../../util/fastmap" }
 failsafe = { version = "0.3.0", default-features = false, features = ["parking_lot_mutex"] }
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 rlp_derive = { path = "../../util/rlp-derive" }
 smallvec = "0.6"
 futures = "0.1"
-rand = "0.6"
+rand = "0.4"
 itertools = "0.5"
-bincode = "1.1"
+bincode = "0.8.0"
 serde = "1.0"
 serde_derive = "1.0"
 parking_lot = "0.7"
 stats = { path = "../../util/stats" }
-keccak-hash = "0.2.0"
+keccak-hash = "0.1"
 keccak-hasher = { path = "../../util/keccak-hasher" }
 triehash-ethereum = { version = "0.2",  path = "../../util/triehash-ethereum" }
 kvdb = "0.1"
--- a/ethcore/light/src/cache.rs
+++ b/ethcore/light/src/cache.rs
@@ -21,12 +21,12 @@
 //! vector of all gas prices from a recent range of blocks.

 use std::time::{Instant, Duration};
-use parity_util_mem::{MallocSizeOf, MallocSizeOfOps, MallocSizeOfExt};

 use common_types::encoded;
 use common_types::BlockNumber;
 use common_types::receipt::Receipt;
 use ethereum_types::{H256, U256};
+use heapsize::HeapSizeOf;
 use memory_cache::MemoryLruCache;
 use stats::Corpus;

@@ -157,20 +157,18 @@ impl Cache {

 	/// Get the memory used.
 	pub fn mem_used(&self) -> usize {
-		self.malloc_size_of()
+		self.heap_size_of_children()
 	}
 }

-
-// This is fast method: it is possible to have a more exhaustive implementation
-impl MallocSizeOf for Cache {
-	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+impl HeapSizeOf for Cache {
+	fn heap_size_of_children(&self) -> usize {
 		self.headers.current_size()
 			+ self.canon_hashes.current_size()
 			+ self.bodies.current_size()
 			+ self.receipts.current_size()
 			+ self.chain_score.current_size()
-			// `self.corpus` is skipped
+			// TODO: + corpus
 	}
 }

--- a/ethcore/light/src/cht.rs
+++ b/ethcore/light/src/cht.rs
@@ -95,8 +95,7 @@ pub struct BlockInfo {
 /// Build an in-memory CHT from a closure which provides necessary information
 /// about blocks. If the fetcher ever fails to provide the info, the CHT
 /// will not be generated.
-pub fn build<F>(cht_num: u64, mut fetcher: F)
-	-> Option<CHT<MemoryDB<KeccakHasher, memory_db::HashKey<KeccakHasher>, DBValue>>>
+pub fn build<F>(cht_num: u64, mut fetcher: F) -> Option<CHT<MemoryDB<KeccakHasher, DBValue>>>
 	where F: FnMut(BlockId) -> Option<BlockInfo>
 {
 	let mut db = new_memory_db();
@@ -105,7 +104,7 @@ pub fn build<F>(cht_num: u64, mut fetcher: F)
 	let last_num = start_number(cht_num + 1) - 1;
 	let mut id = BlockId::Number(last_num);

-	let mut root = H256::zero();
+	let mut root = H256::default();

 	{
 		let mut t = TrieDBMut::new(&mut db, &mut root);
@@ -155,7 +154,7 @@ pub fn compute_root<I>(cht_num: u64, iterable: I) -> Option<H256>
 pub fn check_proof(proof: &[Bytes], num: u64, root: H256) -> Option<(H256, U256)> {
 	let mut db = new_memory_db();

-	for node in proof { db.insert(hash_db::EMPTY_PREFIX, &node[..]); }
+	for node in proof { db.insert(&node[..]); }
 	let res = match TrieDB::new(&db, &root) {
 		Err(_) => return None,
 		Ok(trie) => trie.get_with(&key!(num), |val: &[u8]| {
--- a/ethcore/light/src/client/fetch.rs
+++ b/ethcore/light/src/client/fetch.rs
@@ -21,7 +21,8 @@ use std::sync::Arc;
 use common_types::encoded;
 use common_types::header::Header;
 use common_types::receipt::Receipt;
-use ethcore::engines::{Engine, StateDependentProof};
+use ethcore::engines::{EthEngine, StateDependentProof};
+use ethcore::machine::EthereumMachine;
 use ethereum_types::H256;
 use futures::future::IntoFuture;

@@ -47,8 +48,8 @@ pub trait ChainDataFetcher: Send + Sync + 'static {
 	fn epoch_transition(
 		&self,
 		_hash: H256,
-		_engine: Arc<Engine>,
-		_checker: Arc<StateDependentProof>
+		_engine: Arc<EthEngine>,
+		_checker: Arc<StateDependentProof<EthereumMachine>>
 	) -> Self::Transition;
 }

@@ -76,8 +77,8 @@ impl ChainDataFetcher for Unavailable {
 	fn epoch_transition(
 		&self,
 		_hash: H256,
-		_engine: Arc<Engine>,
-		_checker: Arc<StateDependentProof>
+		_engine: Arc<EthEngine>,
+		_checker: Arc<StateDependentProof<EthereumMachine>>
 	) -> Self::Transition {
 		Err("fetching epoch transition proofs unavailable")
 	}
--- a/ethcore/light/src/client/header_chain.rs
+++ b/ethcore/light/src/client/header_chain.rs
@@ -35,10 +35,10 @@ use common_types::encoded;
 use common_types::header::Header;
 use common_types::ids::BlockId;
 use ethcore::engines::epoch::{Transition as EpochTransition, PendingTransition as PendingEpochTransition};
-use ethcore::error::{Error, EthcoreResult, BlockError};
+use ethcore::error::{Error, EthcoreResult, ErrorKind as EthcoreErrorKind, BlockError};
 use ethcore::spec::{Spec, SpecHardcodedSync};
 use ethereum_types::{H256, H264, U256};
-use parity_util_mem::{MallocSizeOf, MallocSizeOfOps};
+use heapsize::HeapSizeOf;
 use kvdb::{DBTransaction, KeyValueDB};
 use parking_lot::{Mutex, RwLock};
 use fastmap::H256FastMap;
@@ -95,8 +95,8 @@ struct Entry {
 	canonical_hash: H256,
 }

-impl MallocSizeOf for Entry {
-	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+impl HeapSizeOf for Entry {
+	fn heap_size_of_children(&self) -> usize {
 		if self.candidates.spilled() {
 			self.candidates.capacity() * ::std::mem::size_of::<Candidate>()
 		} else {
@@ -154,11 +154,8 @@ fn pending_transition_key(block_hash: H256) -> H264 {

 	let mut key = H264::default();

-	{
-		let bytes = key.as_bytes_mut();
-		bytes[0] = LEADING;
-		bytes[1..].copy_from_slice(block_hash.as_bytes());
-	}
+	key[0] = LEADING;
+	key.0[1..].copy_from_slice(&block_hash.0[..]);

 	key
 }
@@ -168,11 +165,8 @@ fn transition_key(block_hash: H256) -> H264 {

 	let mut key = H264::default();

-	{
-		let bytes = key.as_bytes_mut();
-		bytes[0] = LEADING;
-		bytes[1..].copy_from_slice(block_hash.as_bytes());
-	}
+	key[0] = LEADING;
+	key.0[1..].copy_from_slice(&block_hash.0[..]);

 	key
 }
@@ -202,21 +196,14 @@ pub enum HardcodedSync {
 	Deny,
 }

-#[derive(MallocSizeOf)]
 /// Header chain. See module docs for more details.
 pub struct HeaderChain {
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	genesis_header: encoded::Header, // special-case the genesis.
 	candidates: RwLock<BTreeMap<u64, Entry>>,
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	best_block: RwLock<BlockDescriptor>,
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	live_epoch_proofs: RwLock<H256FastMap<EpochTransition>>,
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	db: Arc<KeyValueDB>,
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	col: Option<u32>,
-	#[ignore_malloc_size_of = "ignored for performance reason"]
 	cache: Arc<Mutex<Cache>>,
 }

@@ -250,7 +237,7 @@ impl HeaderChain {
 				for c in &entry.candidates {
 					let key = transition_key(c.hash);

-					if let Some(proof) = db.get(col, key.as_bytes())? {
+					if let Some(proof) = db.get(col, &*key)? {
 						live_epoch_proofs.insert(c.hash, EpochTransition {
 							block_hash: c.hash,
 							block_number: cur_number,
@@ -267,7 +254,7 @@ impl HeaderChain {
 			let best_block = {
 				let era = match candidates.get(&curr.best_num) {
 					Some(era) => era,
-					None => return Err("Database corrupt: highest block referenced but no data.".into()),
+					None => bail!("Database corrupt: highest block referenced but no data."),
 				};

 				let best = &era.candidates[0];
@@ -416,7 +403,7 @@ impl HeaderChain {
 							.and_then(|entry| entry.candidates.iter().find(|c| c.hash == parent_hash))
 							.map(|c| c.total_difficulty)
 							.ok_or_else(|| BlockError::UnknownParent(parent_hash))
-							.map_err(Error::Block)?
+							.map_err(EthcoreErrorKind::Block)?
 					};

 				parent_td + *header.difficulty()
@@ -444,7 +431,7 @@ impl HeaderChain {
 		}

 		if let Some(transition) = transition {
-			transaction.put(self.col, transition_key(hash).as_bytes(), &transition.proof);
+			transaction.put(self.col, &*transition_key(hash), &transition.proof);
 			self.live_epoch_proofs.write().insert(hash, transition);
 		}

@@ -521,10 +508,10 @@ impl HeaderChain {
 						for ancient in &era_entry.candidates {
 							let maybe_transition = live_epoch_proofs.remove(&ancient.hash);
 							if let Some(epoch_transition) = maybe_transition {
-								transaction.delete(self.col, transition_key(ancient.hash).as_bytes());
+								transaction.delete(self.col, &*transition_key(ancient.hash));

 								if ancient.hash == era_entry.canonical_hash {
-									last_canonical_transition = match self.db.get(self.col, ancient.hash.as_bytes()) {
+									last_canonical_transition = match self.db.get(self.col, &ancient.hash) {
 										Err(e) => {
 											warn!(target: "chain", "Error reading from DB: {}\n
 												", e);
@@ -539,7 +526,7 @@ impl HeaderChain {
 								}
 							}

-							transaction.delete(self.col, ancient.hash.as_bytes());
+							transaction.delete(self.col, &ancient.hash);
 						}

 						let canon = &era_entry.candidates[0];
@@ -589,7 +576,7 @@ impl HeaderChain {
 					} else {
 						let msg = format!("header of block #{} not found in DB ; database in an \
 											inconsistent state", h_num);
-						return Err(msg.into());
+						bail!(msg);
 					};

 					let decoded = header.decode().expect("decoding db value failed");
@@ -660,7 +647,7 @@ impl HeaderChain {
 			match cache.block_header(&hash) {
 				Some(header) => Some(header),
 				None => {
-					match self.db.get(self.col, hash.as_bytes()) {
+					match self.db.get(self.col, &hash) {
 						Ok(db_value) => {
 							db_value.map(|x| x.into_vec()).map(encoded::Header::new)
 								.and_then(|header| {
@@ -785,7 +772,7 @@ impl HeaderChain {

 	/// Get block status.
 	pub fn status(&self, hash: &H256) -> BlockStatus {
-		if self.db.get(self.col, hash.as_bytes()).ok().map_or(false, |x| x.is_some()) {
+		if self.db.get(self.col, hash).ok().map_or(false, |x| x.is_some()) {
 			BlockStatus::InChain
 		} else {
 			BlockStatus::Unknown
@@ -795,13 +782,13 @@ impl HeaderChain {
 	/// Insert a pending transition.
 	pub fn insert_pending_transition(&self, batch: &mut DBTransaction, hash: H256, t: &PendingEpochTransition) {
 		let key = pending_transition_key(hash);
-		batch.put(self.col, key.as_bytes(), &*::rlp::encode(t));
+		batch.put(self.col, &*key, &*::rlp::encode(t));
 	}

 	/// Get pending transition for a specific block hash.
 	pub fn pending_transition(&self, hash: H256) -> Option<PendingEpochTransition> {
 		let key = pending_transition_key(hash);
-		match self.db.get(self.col, key.as_bytes()) {
+		match self.db.get(self.col, &*key) {
 			Ok(db_fetch) => db_fetch.map(|bytes| ::rlp::decode(&bytes).expect("decoding value from db failed")),
 			Err(e) => {
 				warn!(target: "chain", "Error reading from database: {}", e);
@@ -845,6 +832,12 @@ impl HeaderChain {
 	}
 }

+impl HeapSizeOf for HeaderChain {
+	fn heap_size_of_children(&self) -> usize {
+		self.candidates.read().heap_size_of_children()
+	}
+}
+
 /// Iterator over a block's ancestry.
 pub struct AncestryIter<'a> {
 	next: Option<encoded::Header>,
--- a/ethcore/light/src/client/mod.rs
+++ b/ethcore/light/src/client/mod.rs
@@ -19,7 +19,8 @@
 use std::sync::{Weak, Arc};

 use ethcore::client::{ClientReport, EnvInfo, ClientIoMessage};
-use ethcore::engines::{epoch, Engine, EpochChange, EpochTransition, Proof};
+use ethcore::engines::{epoch, EthEngine, EpochChange, EpochTransition, Proof};
+use ethcore::machine::EthereumMachine;
 use ethcore::error::{Error, EthcoreResult};
 use ethcore::verification::queue::{self, HeaderQueue};
 use ethcore::spec::{Spec, SpecHardcodedSync};
@@ -33,7 +34,6 @@ use common_types::blockchain_info::BlockChainInfo;
 use common_types::encoded;
 use common_types::header::Header;
 use common_types::ids::BlockId;
-use common_types::verification_queue_info::VerificationQueueInfo as BlockQueueInfo;

 use kvdb::KeyValueDB;

@@ -91,9 +91,6 @@ pub trait LightChainClient: Send + Sync {
 	/// Attempt to get a block hash by block id.
 	fn block_hash(&self, id: BlockId) -> Option<H256>;

-	/// Get block queue information.
-	fn queue_info(&self) -> BlockQueueInfo;
-
 	/// Attempt to get block header by block id.
 	fn block_header(&self, id: BlockId) -> Option<encoded::Header>;

@@ -114,7 +111,7 @@ pub trait LightChainClient: Send + Sync {
 	fn env_info(&self, id: BlockId) -> Option<EnvInfo>;

 	/// Get a handle to the consensus engine.
-	fn engine(&self) -> &Arc<Engine>;
+	fn engine(&self) -> &Arc<EthEngine>;

 	/// Query whether a block is known.
 	fn is_known(&self, hash: &H256) -> bool;
@@ -128,6 +125,9 @@ pub trait LightChainClient: Send + Sync {
 	/// Flush the queue.
 	fn flush_queue(&self);

+	/// Get queue info.
+	fn queue_info(&self) -> queue::QueueInfo;
+
 	/// Get the `i`th CHT root.
 	fn cht_root(&self, i: usize) -> Option<H256>;

@@ -159,7 +159,7 @@ impl<T: LightChainClient> AsLightClient for T {
 /// Light client implementation.
 pub struct Client<T> {
 	queue: HeaderQueue,
-	engine: Arc<Engine>,
+	engine: Arc<EthEngine>,
 	chain: HeaderChain,
 	report: RwLock<ClientReport>,
 	import_lock: Mutex<()>,
@@ -361,9 +361,9 @@ impl<T: ChainDataFetcher> Client<T> {

 	/// Get blockchain mem usage in bytes.
 	pub fn chain_mem_used(&self) -> usize {
-		use parity_util_mem::MallocSizeOfExt;
+		use heapsize::HeapSizeOf;

-		self.chain.malloc_size_of()
+		self.chain.heap_size_of_children()
 	}

 	/// Set a closure to call when the client wants to be restarted.
@@ -375,7 +375,7 @@ impl<T: ChainDataFetcher> Client<T> {
 	}

 	/// Get a handle to the verification engine.
-	pub fn engine(&self) -> &Arc<Engine> {
+	pub fn engine(&self) -> &Arc<EthEngine> {
 		&self.engine
 	}

@@ -467,7 +467,7 @@ impl<T: ChainDataFetcher> Client<T> {
 		true
 	}

-	fn check_epoch_signal(&self, verified_header: &Header) -> Result<Option<Proof>, T::Error> {
+	fn check_epoch_signal(&self, verified_header: &Header) -> Result<Option<Proof<EthereumMachine>>, T::Error> {
 		use ethcore::machine::{AuxiliaryRequest, AuxiliaryData};

 		let mut block: Option<Vec<u8>> = None;
@@ -513,7 +513,7 @@ impl<T: ChainDataFetcher> Client<T> {
 	}

 	// attempts to fetch the epoch proof from the network until successful.
-	fn write_pending_proof(&self, header: &Header, proof: Proof) -> Result<(), T::Error> {
+	fn write_pending_proof(&self, header: &Header, proof: Proof<EthereumMachine>) -> Result<(), T::Error> {
 		let proof = match proof {
 			Proof::Known(known) => known,
 			Proof::WithState(state_dependent) => {
@@ -534,7 +534,6 @@ impl<T: ChainDataFetcher> Client<T> {
 	}
 }

-
 impl<T: ChainDataFetcher> LightChainClient for Client<T> {
 	fn add_listener(&self, listener: Weak<LightChainNotify>) {
 		Client::add_listener(self, listener)
@@ -542,10 +541,6 @@ impl<T: ChainDataFetcher> LightChainClient for Client<T> {

 	fn chain_info(&self) -> BlockChainInfo { Client::chain_info(self) }

-	fn queue_info(&self) -> queue::QueueInfo {
-		self.queue.queue_info()
-	}
-
 	fn queue_header(&self, header: Header) -> EthcoreResult<H256> {
 		self.import_header(header)
 	}
@@ -578,7 +573,7 @@ impl<T: ChainDataFetcher> LightChainClient for Client<T> {
 		Client::env_info(self, id)
 	}

-	fn engine(&self) -> &Arc<Engine> {
+	fn engine(&self) -> &Arc<EthEngine> {
 		Client::engine(self)
 	}

@@ -605,6 +600,10 @@ impl<T: ChainDataFetcher> LightChainClient for Client<T> {
 		Client::flush_queue(self);
 	}

+	fn queue_info(&self) -> queue::QueueInfo {
+		self.queue.queue_info()
+	}
+
 	fn cht_root(&self, i: usize) -> Option<H256> {
 		Client::cht_root(self, i)
 	}
--- a/ethcore/light/src/client/service.rs
+++ b/ethcore/light/src/client/service.rs
@@ -75,8 +75,9 @@ impl<T: ChainDataFetcher> Service<T> {
 			io_service.channel(),
 			cache,
 		)?);
-		spec.engine.register_client(Arc::downgrade(&client) as _);
+
 		io_service.register_handler(Arc::new(ImportBlocks(client.clone()))).map_err(Error::Io)?;
+		spec.engine.register_client(Arc::downgrade(&client) as _);

 		Ok(Service {
 			client,
--- a/ethcore/light/src/lib.rs
+++ b/ethcore/light/src/lib.rs
@@ -61,12 +61,9 @@ extern crate ethcore_io as io;
 extern crate ethcore_network as network;
 extern crate parity_bytes as bytes;
 extern crate ethereum_types;
-extern crate ethcore_miner as miner;
 extern crate ethcore;
 extern crate hash_db;
-extern crate parity_util_mem;
-extern crate parity_util_mem as mem;
-extern crate parity_util_mem as malloc_size_of;
+extern crate heapsize;
 extern crate failsafe;
 extern crate futures;
 extern crate itertools;
@@ -88,7 +85,8 @@ extern crate keccak_hash as hash;
 extern crate triehash_ethereum as triehash;
 extern crate kvdb;
 extern crate memory_cache;
-extern crate derive_more;
+#[macro_use]
+extern crate error_chain;

 #[cfg(test)]
 extern crate kvdb_memorydb;
--- a/ethcore/light/src/net/load_timer.rs
+++ b/ethcore/light/src/net/load_timer.rs
@@ -199,15 +199,15 @@ pub struct FileStore(pub PathBuf);
 impl SampleStore for FileStore {
 	fn load(&self) -> HashMap<Kind, VecDeque<u64>> {
 		File::open(&self.0)
-			.map_err(|e| Box::new(bincode::ErrorKind::Io(e)))
-			.and_then(|mut file| bincode::deserialize_from(&mut file))
+			.map_err(|e| Box::new(bincode::ErrorKind::IoError(e)))
+			.and_then(|mut file| bincode::deserialize_from(&mut file, bincode::Infinite))
 			.unwrap_or_else(|_| HashMap::new())
 	}

 	fn store(&self, samples: &HashMap<Kind, VecDeque<u64>>) {
 		let res = File::create(&self.0)
-			.map_err(|e| Box::new(bincode::ErrorKind::Io(e)))
-			.and_then(|mut file| bincode::serialize_into(&mut file, samples));
+			.map_err(|e| Box::new(bincode::ErrorKind::IoError(e)))
+			.and_then(|mut file| bincode::serialize_into(&mut file, samples, bincode::Infinite));

 		if let Err(e) = res {
 			warn!(target: "pip", "Error writing light request timing samples to file: {}", e);
--- a/ethcore/light/src/net/status.rs
+++ b/ethcore/light/src/net/status.rs
@@ -382,7 +382,7 @@ mod tests {
 			protocol_version: 1,
 			network_id: 1,
 			head_td: U256::default(),
-			head_hash: H256::zero(),
+			head_hash: H256::default(),
 			head_num: 10,
 			genesis_hash: H256::zero(),
 			last_head: None,
@@ -417,7 +417,7 @@ mod tests {
 			protocol_version: 1,
 			network_id: 1,
 			head_td: U256::default(),
-			head_hash: H256::zero(),
+			head_hash: H256::default(),
 			head_num: 10,
 			genesis_hash: H256::zero(),
 			last_head: None,
@@ -452,7 +452,7 @@ mod tests {
 			protocol_version: 1,
 			network_id: 1,
 			head_td: U256::default(),
-			head_hash: H256::zero(),
+			head_hash: H256::default(),
 			head_num: 10,
 			genesis_hash: H256::zero(),
 			last_head: None,
@@ -550,7 +550,7 @@ mod tests {
 			protocol_version: 1,
 			network_id: 1,
 			head_td: U256::default(),
-			head_hash: H256::zero(),
+			head_hash: H256::default(),
 			head_num: 10,
 			genesis_hash: H256::zero(),
 			last_head: None,
--- a/ethcore/light/src/net/tests/mod.rs
+++ b/ethcore/light/src/net/tests/mod.rs
@@ -22,7 +22,7 @@ use common_types::encoded;
 use common_types::ids::BlockId;
 use common_types::transaction::{Action, PendingTransaction};
 use ethcore::client::{EachBlockWith, TestBlockChainClient};
-use ethereum_types::{H256, U256, Address, BigEndianHash};
+use ethereum_types::{H256, U256, Address};
 use net::context::IoContext;
 use net::load_timer::MOVING_SAMPLE_SIZE;
 use net::status::{Capabilities, Status};
@@ -158,7 +158,7 @@ impl Provider for TestProvider {

 	fn contract_code(&self, req: request::CompleteCodeRequest) -> Option<request::CodeResponse> {
 		Some(CodeResponse {
-			code: req.block_hash.as_bytes().iter().chain(req.code_hash.as_bytes().iter()).cloned().collect(),
+			code: req.block_hash.iter().chain(req.code_hash.iter()).cloned().collect(),
 		})
 	}

@@ -261,7 +261,7 @@ fn genesis_mismatch() {
 	let (provider, proto) = setup(capabilities);

 	let mut status = status(provider.client.chain_info());
-	status.genesis_hash = H256::zero();
+	status.genesis_hash = H256::default();

 	let packet_body = write_handshake(&status, &capabilities, &proto);

@@ -472,16 +472,16 @@ fn get_state_proofs() {
 	}

 	let req_id = 112;
-	let key1: H256 = BigEndianHash::from_uint(&U256::from(11223344));
-	let key2: H256 = BigEndianHash::from_uint(&U256::from(99988887));
+	let key1: H256 = U256::from(11223344).into();
+	let key2: H256 = U256::from(99988887).into();

 	let mut builder = Builder::default();
 	builder.push(Request::Account(IncompleteAccountRequest {
-		block_hash: H256::zero().into(),
+		block_hash: H256::default().into(),
 		address_hash: key1.into(),
 	})).unwrap();
 	builder.push(Request::Storage(IncompleteStorageRequest {
-		block_hash: H256::zero().into(),
+		block_hash: H256::default().into(),
 		address_hash: key1.into(),
 		key_hash: key2.into(),
 	})).unwrap();
@@ -492,11 +492,11 @@ fn get_state_proofs() {
 	let response = {
 		let responses = vec![
 			Response::Account(provider.account_proof(CompleteAccountRequest {
-				block_hash: H256::zero(),
+				block_hash: H256::default(),
 				address_hash: key1,
 			}).unwrap()),
 			Response::Storage(provider.storage_proof(CompleteStorageRequest {
-				block_hash: H256::zero(),
+				block_hash: H256::default(),
 				address_hash: key1,
 				key_hash: key2,
 			}).unwrap()),
@@ -529,8 +529,8 @@ fn get_contract_code() {
 	}

 	let req_id = 112;
-	let key1: H256 = BigEndianHash::from_uint(&U256::from(11223344));
-	let key2: H256 = BigEndianHash::from_uint(&U256::from(99988887));
+	let key1: H256 = U256::from(11223344).into();
+	let key2: H256 = U256::from(99988887).into();

 	let request = Request::Code(IncompleteCodeRequest {
 		block_hash: key1.into(),
@@ -541,7 +541,7 @@ fn get_contract_code() {
 	let request_body = make_packet(req_id, &requests);
 	let response = {
 		let response = vec![Response::Code(CodeResponse {
-			code: key1.as_bytes().iter().chain(key2.as_bytes().iter()).cloned().collect(),
+			code: key1.iter().chain(key2.iter()).cloned().collect(),
 		})];

 		let new_creds = *flow_params.limit() - flow_params.compute_cost_multi(requests.requests()).unwrap();
@@ -616,9 +616,9 @@ fn proof_of_execution() {

 	let req_id = 112;
 	let mut request = Request::Execution(request::IncompleteExecutionRequest {
-		block_hash: H256::zero().into(),
-		from: Address::zero(),
-		action: Action::Call(Address::zero()),
+		block_hash: H256::default().into(),
+		from: Address::default(),
+		action: Action::Call(Address::default()),
 		gas: 100.into(),
 		gas_price: 0.into(),
 		value: 0.into(),
@@ -755,7 +755,7 @@ fn get_transaction_index() {
 	}

 	let req_id = 112;
-	let key1: H256 = BigEndianHash::from_uint(&U256::from(11223344));
+	let key1: H256 = U256::from(11223344).into();

 	let request = Request::TransactionIndex(IncompleteTransactionIndexRequest {
 		hash: key1.into(),
--- a/ethcore/light/src/on_demand/mod.rs
+++ b/ethcore/light/src/on_demand/mod.rs
@@ -66,31 +66,32 @@ pub const DEFAULT_NUM_CONSECUTIVE_FAILED_REQUESTS: usize = 1;

 /// OnDemand related errors
 pub mod error {
+	// Silence: `use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting`
+	// https://github.com/paritytech/parity-ethereum/issues/10302
+	#![allow(deprecated)]
+
 	use futures::sync::oneshot::Canceled;

-	/// OnDemand Error
-	#[derive(Debug, derive_more::Display, derive_more::From)]
-	pub enum Error {
-		/// Canceled oneshot channel
-		ChannelCanceled(Canceled),
-		/// Timeout bad response
-		BadResponse(String),
-		/// OnDemand requests limit exceeded
-		#[display(fmt = "OnDemand request maximum backoff iterations exceeded")]
-		RequestLimit,
-	}
+	error_chain! {

-	impl std::error::Error for Error {
-		fn source(&self) -> Option<&(std::error::Error + 'static)> {
-			match self {
-				Error::ChannelCanceled(err) => Some(err),
-				_ => None,
+		foreign_links {
+			ChannelCanceled(Canceled) #[doc = "Canceled oneshot channel"];
+		}
+
+		errors {
+			#[doc = "Timeout bad response"]
+			BadResponse(err: String) {
+				description("Max response evaluation time exceeded")
+				display("{}", err)
+			}
+
+			#[doc = "OnDemand requests limit exceeded"]
+			RequestLimit {
+				description("OnDemand request maximum backoff iterations exceeded")
+				display("OnDemand request maximum backoff iterations exceeded")
 			}
 		}
 	}
-
-	/// OnDemand Result
-	pub type Result<T> = std::result::Result<T, Error>;
 }

 /// Public interface for performing network requests `OnDemand`
@@ -271,7 +272,7 @@ impl Pending {
 			response_err
 		);

-		let err = self::error::Error::BadResponse(err);
+		let err = self::error::ErrorKind::BadResponse(err);
 		if self.sender.send(Err(err.into())).is_err() {
 			debug!(target: "on_demand", "Dropped oneshot channel receiver on no response");
 		}
@@ -279,7 +280,7 @@ impl Pending {

 	// returning a peer discovery timeout during query attempts
 	fn request_limit_reached(self) {
-		let err = self::error::Error::RequestLimit;
+		let err = self::error::ErrorKind::RequestLimit;
 		if self.sender.send(Err(err.into())).is_err() {
 			debug!(target: "on_demand", "Dropped oneshot channel receiver on time out");
 		}
--- a/ethcore/light/src/on_demand/request.rs
+++ b/ethcore/light/src/on_demand/request.rs
@@ -24,7 +24,8 @@ use common_types::basic_account::BasicAccount;
 use common_types::encoded;
 use common_types::receipt::Receipt;
 use common_types::transaction::SignedTransaction;
-use ethcore::engines::{Engine, StateDependentProof};
+use ethcore::engines::{EthEngine, StateDependentProof};
+use ethcore::machine::EthereumMachine;
 use ethcore::state::{self, ProvedExecution};
 use ethereum_types::{H256, U256, Address};
 use ethtrie::{TrieError, TrieDB};
@@ -980,9 +981,9 @@ impl Account {
 		let state_root = header.state_root();

 		let mut db = journaldb::new_memory_db();
-		for node in proof { db.insert(hash_db::EMPTY_PREFIX, &node[..]); }
+		for node in proof { db.insert(&node[..]); }

-		match TrieDB::new(&db, &state_root).and_then(|t| t.get(keccak(&self.address).as_bytes()))? {
+		match TrieDB::new(&db, &state_root).and_then(|t| t.get(&keccak(&self.address)))? {
 			Some(val) => {
 				let rlp = Rlp::new(&val);
 				Ok(Some(BasicAccount {
@@ -1037,7 +1038,7 @@ pub struct TransactionProof {
 	// TODO: it's not really possible to provide this if the header is unknown.
 	pub env_info: EnvInfo,
 	/// Consensus engine.
-	pub engine: Arc<Engine>,
+	pub engine: Arc<EthEngine>,
 }

 impl TransactionProof {
@@ -1080,9 +1081,9 @@ pub struct Signal {
 	/// Block hash and number to fetch proof for.
 	pub hash: H256,
 	/// Consensus engine, used to check the proof.
-	pub engine: Arc<Engine>,
+	pub engine: Arc<EthEngine>,
 	/// Special checker for the proof.
-	pub proof_check: Arc<StateDependentProof>,
+	pub proof_check: Arc<StateDependentProof<EthereumMachine>>,
 }

 impl Signal {
@@ -1161,7 +1162,7 @@ mod tests {

 	#[test]
 	fn check_header_with_ancestors() {
-		let mut last_header_hash = H256::zero();
+		let mut last_header_hash = H256::default();
 		let mut headers = (0..11).map(|num| {
 			let mut header = Header::new();
 			header.set_number(num);
@@ -1277,7 +1278,7 @@ mod tests {
 	fn check_state_proof() {
 		use rlp::RlpStream;

-		let mut root = H256::zero();
+		let mut root = H256::default();
 		let mut db = journaldb::new_memory_db();
 		let mut header = Header::new();
 		header.set_number(123_456);
@@ -1297,17 +1298,17 @@ mod tests {
 			let mut trie = SecTrieDBMut::new(&mut db, &mut root);
 			for _ in 0..100 {
 				let address = Address::random();
-				trie.insert(address.as_bytes(), &rand_acc()).unwrap();
+				trie.insert(&*address, &rand_acc()).unwrap();
 			}

-			trie.insert(addr.as_bytes(), &rand_acc()).unwrap();
+			trie.insert(&*addr, &rand_acc()).unwrap();
 		}

 		let proof = {
 			let trie = SecTrieDB::new(&db, &root).unwrap();
 			let mut recorder = Recorder::new();

-			trie.get_with(addr.as_bytes(), &mut recorder).unwrap().unwrap();
+			trie.get_with(&*addr, &mut recorder).unwrap().unwrap();

 			recorder.drain().into_iter().map(|r| r.data).collect::<Vec<_>>()
 		};
--- a/ethcore/light/src/on_demand/tests.rs
+++ b/ethcore/light/src/on_demand/tests.rs
@@ -117,9 +117,9 @@ fn dummy_status() -> Status {
 		protocol_version: 1,
 		network_id: 999,
 		head_td: 1.into(),
-		head_hash: H256::zero(),
+		head_hash: H256::default(),
 		head_num: 1359,
-		genesis_hash: H256::zero(),
+		genesis_hash: H256::default(),
 		last_head: None,
 	}
 }
@@ -138,7 +138,7 @@ fn detects_hangup() {
 	let on_demand = Harness::create().service;
 	let result = on_demand.request_raw(
 		&Context::NoOp,
-		vec![request::HeaderByHash(H256::zero().into()).into()],
+		vec![request::HeaderByHash(H256::default().into()).into()],
 	);

 	assert_eq!(on_demand.pending.read().len(), 1);
@@ -199,7 +199,7 @@ fn no_capabilities() {

 	let _recv = harness.service.request_raw(
 		&Context::NoOp,
-		vec![request::HeaderByHash(H256::zero().into()).into()]
+		vec![request::HeaderByHash(H256::default().into()).into()]
 	).unwrap();

 	assert_eq!(harness.service.pending.read().len(), 1);
@@ -395,7 +395,7 @@ fn wrong_kind() {

 	let _recv = harness.service.request_raw(
 		&Context::NoOp,
-		vec![request::HeaderByHash(H256::zero().into()).into()]
+		vec![request::HeaderByHash(H256::default().into()).into()]
 	).unwrap();

 	assert_eq!(harness.service.pending.read().len(), 1);
--- a/ethcore/light/src/transaction_queue.rs
+++ b/ethcore/light/src/transaction_queue.rs
@@ -24,15 +24,12 @@
 //! address-wise manner.

 use std::fmt;
-use std::sync::Arc;
 use std::collections::{BTreeMap, HashMap};
 use std::collections::hash_map::Entry;

 use common_types::transaction::{self, Condition, PendingTransaction, SignedTransaction};
 use ethereum_types::{H256, U256, Address};
 use fastmap::H256FastMap;
-use futures::sync::mpsc;
-use miner::pool::TxStatus;

 // Knowledge of an account's current nonce.
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -129,13 +126,14 @@ pub enum ImportDestination {
 	Future,
 }

+type Listener = Box<Fn(&[H256]) + Send + Sync>;
+
 /// Light transaction queue. See module docs for more details.
 #[derive(Default)]
 pub struct TransactionQueue {
 	by_account: HashMap<Address, AccountTransactions>,
 	by_hash: H256FastMap<PendingTransaction>,
-	pending_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<H256>>>>,
-	full_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>>,
+	listeners: Vec<Listener>,
 }

 impl fmt::Debug for TransactionQueue {
@@ -143,8 +141,7 @@ impl fmt::Debug for TransactionQueue {
 		fmt.debug_struct("TransactionQueue")
 			.field("by_account", &self.by_account)
 			.field("by_hash", &self.by_hash)
-			.field("pending_listeners", &self.pending_listeners.len())
-			.field("full_listeners", &self.pending_listeners.len())
+			.field("listeners", &self.listeners.len())
 			.finish()
 	}
 }
@@ -234,7 +231,7 @@ impl TransactionQueue {
 		};

 		self.by_hash.insert(hash, tx);
-		self.notify(&promoted, TxStatus::Added);
+		self.notify(&promoted);
 		Ok(res)
 	}

@@ -346,8 +343,6 @@ impl TransactionQueue {
 		trace!(target: "txqueue", "Culled {} old transactions from sender {} (nonce={})",
 			removed_hashes.len(), address, cur_nonce);

-		self.notify(&removed_hashes, TxStatus::Culled);
-
 		for hash in removed_hashes {
 			self.by_hash.remove(&hash);
 		}
@@ -359,40 +354,15 @@ impl TransactionQueue {
 	}

 	/// Add a transaction queue listener.
-	pub fn pending_transactions_receiver(&mut self) -> mpsc::UnboundedReceiver<Arc<Vec<H256>>> {
-		let (sender, receiver) = mpsc::unbounded();
-		self.pending_listeners.push(sender);
-		receiver
-	}
-
-	/// Add a transaction queue listener.
-	pub fn full_transactions_receiver(&mut self) -> mpsc::UnboundedReceiver<Arc<Vec<(H256, TxStatus)>>> {
-		let (sender, receiver) = mpsc::unbounded();
-		self.full_listeners.push(sender);
-		receiver
+	pub fn add_listener(&mut self, f: Listener) {
+		self.listeners.push(f);
 	}

 	/// Notifies all listeners about new pending transaction.
-	fn notify(&mut self, hashes: &[H256], status: TxStatus) {
-		if status == TxStatus::Added {
-			let to_pending_send: Arc<Vec<H256>> = Arc::new(
-				hashes
-					.into_iter()
-					.map(|hash| hash.clone())
-					.collect()
-			);
-			self.pending_listeners.retain(|listener| listener.unbounded_send(to_pending_send.clone()).is_ok());
-
+	fn notify(&self, hashes: &[H256]) {
+		for listener in &self.listeners {
+			listener(hashes)
 		}
-
-		let to_full_send: Arc<Vec<(H256, TxStatus)>> = Arc::new(
-			hashes
-				.into_iter()
-				.map(|hash| (hash.clone(), status))
-				.collect()
-		);
-
-		self.full_listeners.retain(|listener| listener.unbounded_send(to_full_send.clone()).is_ok());
 	}
 }

@@ -404,7 +374,7 @@ mod tests {

 	#[test]
 	fn queued_senders() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();
 		let tx = Transaction::default().fake_sign(sender);

@@ -420,7 +390,7 @@ mod tests {

 	#[test]
 	fn next_nonce() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		for i in (0..5).chain(10..15) {
@@ -451,7 +421,7 @@ mod tests {

 	#[test]
 	fn current_to_future() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		for i in 5..10 {
@@ -494,7 +464,7 @@ mod tests {
 	#[test]
 	fn conditional() {
 		let mut txq = TransactionQueue::default();
-		let sender = Address::zero();
+		let sender = Address::default();

 		for i in 0..5 {
 			let mut tx = Transaction::default();
@@ -516,7 +486,7 @@ mod tests {

 	#[test]
 	fn cull_from_future() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		for i in (0..1).chain(3..10) {
@@ -536,7 +506,7 @@ mod tests {

 	#[test]
 	fn import_old() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		let mut tx_a = Transaction::default();
@@ -553,7 +523,7 @@ mod tests {

 	#[test]
 	fn replace_is_removed() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		let tx_b: PendingTransaction = Transaction::default().fake_sign(sender).into();
@@ -573,7 +543,7 @@ mod tests {

 	#[test]
 	fn future_transactions() {
-		let sender = Address::zero();
+		let sender = Address::default();
 		let mut txq = TransactionQueue::default();

 		for i in (0..1).chain(3..10) {
--- a/ethcore/light/src/types/request/batch.rs
+++ b/ethcore/light/src/types/request/batch.rs
@@ -220,7 +220,7 @@ mod tests {
 			num: 100.into(),
 		})).unwrap();
 		builder.push(Request::Receipts(IncompleteReceiptsRequest {
-			hash: H256::zero().into(),
+			hash: H256::default().into(),
 		})).unwrap();
 	}

@@ -267,7 +267,7 @@ mod tests {
 		})).unwrap();

 		let mut batch = builder.build();
-		batch.requests[1].fill(|_req_idx, _out_idx| Ok(Output::Hash(H256::from_low_u64_be(42))));
+		batch.requests[1].fill(|_req_idx, _out_idx| Ok(Output::Hash(42.into())));

 		assert!(batch.next_complete().is_some());
 		batch.answered += 1;
@@ -289,7 +289,7 @@ mod tests {
 		assert!(batch.next_complete().is_some());
 		let hdr_proof_res = header_proof::Response {
 			proof: vec![],
-			hash: H256::from_low_u64_be(12),
+			hash: 12.into(),
 			td: 21.into(),
 		};
 		batch.supply_response_unchecked(&hdr_proof_res);
@@ -308,7 +308,7 @@ mod tests {
 		})).unwrap();

 		let mut batch = builder.build();
-		batch.requests[1].fill(|_req_idx, _out_idx| Ok(Output::Hash(H256::from_low_u64_be(42))));
+		batch.requests[1].fill(|_req_idx, _out_idx| Ok(Output::Hash(42.into())));

 		assert!(batch.next_complete().is_some());
 		batch.answered += 1;
--- a/ethcore/light/src/types/request/mod.rs
+++ b/ethcore/light/src/types/request/mod.rs
@@ -1648,7 +1648,7 @@ mod tests {

 	#[test]
 	fn hash_or_number_roundtrip() {
-		let hash = HashOrNumber::Hash(H256::zero());
+		let hash = HashOrNumber::Hash(H256::default());
 		let number = HashOrNumber::Number(5);

 		check_roundtrip(hash);
@@ -1808,7 +1808,7 @@ mod tests {
 		let full_req = Request::Storage(req.clone());
 		let res = StorageResponse {
 			proof: vec![vec![1, 2, 3], vec![4, 5, 6]],
-			value: H256::zero(),
+			value: H256::default(),
 		};
 		let full_res = Response::Storage(res.clone());

@@ -1909,7 +1909,7 @@ mod tests {
 				code_hash: Default::default(),
 				storage_root: Default::default()
 			}),
-			Response::Storage(StorageResponse { proof: vec![], value: H256::zero() }),
+			Response::Storage(StorageResponse { proof: vec![], value: H256::default() }),
 			Response::Code(CodeResponse { code: vec![1, 2, 3, 4, 5] }),
 			Response::Execution(ExecutionResponse { items: vec![] }),
 		];
--- a/ethcore/node-filter/Cargo.toml
+++ b/ethcore/node-filter/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-description = "Parity Smart Contract based Node Filter, Manage Permissions of Network Connections"
+description = "Parity smart network connections"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "node-filter"
@@ -10,12 +10,12 @@ authors = ["Parity Technologies <admin@parity.io>"]
 ethcore = { path = ".."}
 ethcore-network = { path = "../../util/network" }
 ethcore-network-devp2p = { path = "../../util/network-devp2p" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 log = "0.4"
 parking_lot = "0.7"
-ethabi = "8.0"
-ethabi-derive = "8.0"
-ethabi-contract = "8.0"
+ethabi = "6.0"
+ethabi-derive = "6.0"
+ethabi-contract = "6.0"
 lru-cache = "0.1"

 [dev-dependencies]
--- a/ethcore/node-filter/src/lib.rs
+++ b/ethcore/node-filter/src/lib.rs
@@ -37,17 +37,13 @@ extern crate tempdir;
 #[macro_use]
 extern crate log;

-use std::collections::{HashMap, VecDeque};
 use std::sync::Weak;

-use ethcore::client::{BlockChainClient, BlockId, ChainNotify, NewBlocks};
-
+use ethcore::client::{BlockChainClient, BlockId};
 use ethereum_types::{H256, Address};
 use ethabi::FunctionOutputDecoder;
 use network::{ConnectionFilter, ConnectionDirection};
 use devp2p::NodeId;
-use devp2p::MAX_NODES_IN_TABLE;
-use parking_lot::RwLock;

 use_contract!(peer_set, "res/peer_set.json");

@@ -55,27 +51,14 @@ use_contract!(peer_set, "res/peer_set.json");
 pub struct NodeFilter {
 	client: Weak<BlockChainClient>,
 	contract_address: Address,
-	cache: RwLock<Cache>
 }

-struct Cache {
-	cache: HashMap<NodeId, bool>,
-	order: VecDeque<NodeId>
-}
-
-// Increase cache size due to possible reserved peers, which do not count in the node table size
-pub const CACHE_SIZE: usize = MAX_NODES_IN_TABLE + 1024;
-
 impl NodeFilter {
 	/// Create a new instance. Accepts a contract address.
 	pub fn new(client: Weak<BlockChainClient>, contract_address: Address) -> NodeFilter {
 		NodeFilter {
 			client,
 			contract_address,
-			cache: RwLock::new(Cache{
-				cache: HashMap::with_capacity(CACHE_SIZE),
-				order: VecDeque::with_capacity(CACHE_SIZE)
-			})
 		}
 	}
 }
@@ -87,10 +70,6 @@ impl ConnectionFilter for NodeFilter {
 			None => return false,
 		};

-		if let Some(allowed) = self.cache.read().cache.get(connecting_id) {
-			return *allowed;
-		}
-
 		let address = self.contract_address;
 		let own_low = H256::from_slice(&own_id[0..32]);
 		let own_high = H256::from_slice(&own_id[32..64]);
@@ -104,23 +83,8 @@ impl ConnectionFilter for NodeFilter {
 				debug!("Error callling peer set contract: {:?}", e);
 				false
 			});
-		let mut cache = self.cache.write();
-		if cache.cache.len() == CACHE_SIZE {
-			let popped = cache.order.pop_front().expect("the cache is full so there's at least one item we can pop; qed");
-			cache.cache.remove(&popped);
-		};
-		if cache.cache.insert(*connecting_id, allowed).is_none() {
-			cache.order.push_back(*connecting_id);
-		}
-		allowed
-	}
-}

-impl ChainNotify for NodeFilter {
-	fn new_blocks(&self, _new_blocks: NewBlocks)	{
-		let mut cache = self.cache.write();
-		cache.cache.clear();
-		cache.order.clear();
+		allowed
 	}
 }

@@ -135,13 +99,11 @@ mod test {
 	use io::IoChannel;
 	use super::NodeFilter;
 	use tempdir::TempDir;
-	use ethereum_types::Address;
-	use std::str::FromStr;

 	/// Contract code: https://gist.github.com/arkpar/467dbcc73cbb85b0997a7a10ffa0695f
 	#[test]
 	fn node_filter() {
-		let contract_addr = Address::from_str("0000000000000000000000000000000000000005").unwrap();
+		let contract_addr = "0000000000000000000000000000000000000005".into();
 		let data = include_bytes!("../res/node_filter.json");
 		let tempdir = TempDir::new("").unwrap();
 		let spec = Spec::load(&tempdir.path(), &data[..]).unwrap();
@@ -155,11 +117,11 @@ mod test {
 			IoChannel::disconnected(),
 		).unwrap();
 		let filter = NodeFilter::new(Arc::downgrade(&client) as Weak<BlockChainClient>, contract_addr);
-		let self1 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002").unwrap();
-		let self2 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003").unwrap();
-		let node1 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012").unwrap();
-		let node2 = NodeId::from_str("00000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022").unwrap();
-		let nodex = NodeId::from_str("77000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
+		let self1: NodeId = "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002".into();
+		let self2: NodeId = "00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003".into();
+		let node1: NodeId = "00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012".into();
+		let node2: NodeId = "00000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022".into();
+		let nodex: NodeId = "77000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();

 		assert!(filter.connection_allowed(&self1, &node1, ConnectionDirection::Inbound));
 		assert!(filter.connection_allowed(&self1, &nodex, ConnectionDirection::Inbound));
--- a/ethcore/pod-account/Cargo.toml
+++ b/ethcore/pod-account/Cargo.toml
@@ -1,27 +0,0 @@
-[package]
-description = "Account system expressed in Plain Old Data."
-name = "pod-account"
-version = "0.1.0"
-authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
-
-[dependencies]
-common-types = { path = "../types" }
-ethereum-types = "0.6"
-ethjson = { path = "../../json" }
-ethtrie = { package = "patricia-trie-ethereum", path = "../../util/patricia-trie-ethereum" }
-hash-db = "0.12"
-itertools = "0.8"
-keccak-hash = "0.2.0"
-keccak-hasher = { path = "../../util/keccak-hasher" }
-kvdb = "0.1"
-log = "0.4"
-parity-bytes = "0.1.0"
-rlp = "0.4"
-rustc-hex = "1"
-serde = { version = "1.0", features = ["derive"] }
-trie-db = "0.12.4"
-triehash = { package = "triehash-ethereum", version = "0.2",  path = "../../util/triehash-ethereum" }
-
-[dev-dependencies]
-macros = { path = "../../util/macros" }
--- a/ethcore/private-tx/Cargo.toml
+++ b/ethcore/private-tx/Cargo.toml
@@ -8,34 +8,33 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 common-types = { path = "../types" }
 derive_more = "0.14.0"
-ethabi = "8.0"
-ethabi-contract = "8.0"
-ethabi-derive = "8.0"
+ethabi = "6.0"
+ethabi-contract = "6.0"
+ethabi-derive = "6.0"
 ethcore = { path = ".." }
 ethcore-call-contract = { path = "../call-contract" }
 ethcore-io = { path = "../../util/io" }
 ethcore-miner = { path = "../../miner" }
-ethereum-types = "0.6.0"
+ethereum-types = "0.4"
 ethjson = { path = "../../json" }
 ethkey = { path = "../../accounts/ethkey" }
 fetch = { path = "../../util/fetch" }
 futures = "0.1"
-parity-util-mem = "0.1"
-keccak-hash = "0.2.0"
+heapsize = "0.4"
+keccak-hash = "0.1.2"
 log = "0.4"
 parity-bytes = "0.1"
-parity-crypto = "0.4.0"
+parity-crypto = "0.3.0"
 parking_lot = "0.7"
-trie-db = "0.12.4"
+trie-db = "0.11.0"
 patricia-trie-ethereum = { path = "../../util/patricia-trie-ethereum" }
 rand = "0.3"
-rlp = "0.4.0"
+rlp = { version = "0.3.0", features = ["ethereum"] }
 rlp_derive = { path = "../../util/rlp-derive" }
 rustc-hex = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
-time-utils = { path = "../../util/time-utils" }
 tiny-keccak = "1.4"
 transaction-pool = "2.0"
 url = "1"
--- a/ethcore/private-tx/src/encryptor.rs
+++ b/ethcore/private-tx/src/encryptor.rs
@@ -60,7 +60,7 @@ pub trait Encryptor: Send + Sync + 'static {
 	) -> Result<Bytes, Error>;
 }

-/// Configuration for key server encryptor
+/// Configurtion for key server encryptor
 #[derive(Default, PartialEq, Debug, Clone)]
 pub struct EncryptorConfig {
 	/// URL to key server
@@ -114,7 +114,7 @@ impl SecretStoreEncryptor {
 		let requester = self.config.key_server_account.ok_or_else(|| Error::KeyServerAccountNotSet)?;

 		// key id in SS is H256 && we have H160 here => expand with assitional zeros
-		let contract_address_extended: H256 = (*contract_address).into();
+		let contract_address_extended: H256 = contract_address.into();
 		let base_url = self.config.base_url.clone().ok_or_else(|| Error::KeyServerNotSet)?;

 		// prepare request url
@@ -156,7 +156,7 @@ impl SecretStoreEncryptor {
 		let decrypted_key = Public::from_slice(&decrypted_bytes);

 		// and now take x coordinate of Public as a key
-		let key: Bytes = decrypted_key.as_bytes()[..INIT_VEC_LEN].into();
+		let key: Bytes = (*decrypted_key)[..INIT_VEC_LEN].into();

 		// cache the key in the session and clear expired sessions
 		self.sessions.lock().insert(*contract_address, EncryptionSession{
@@ -212,11 +212,11 @@ impl Encryptor for SecretStoreEncryptor {
 		}?;

 		// encrypt data
-		let mut cypher = Vec::with_capacity(plain_data.len() + initialisation_vector.as_bytes().len());
+		let mut cypher = Vec::with_capacity(plain_data.len() + initialisation_vector.len());
 		cypher.extend(repeat(0).take(plain_data.len()));
-		crypto::aes::encrypt_128_ctr(&key, initialisation_vector.as_bytes(), plain_data, &mut cypher)
+		crypto::aes::encrypt_128_ctr(&key, initialisation_vector, plain_data, &mut cypher)
 			.map_err(|e| Error::Encrypt(e.to_string()))?;
-		cypher.extend_from_slice(&initialisation_vector.as_bytes());
+		cypher.extend_from_slice(&initialisation_vector);

 		Ok(cypher)
 	}
--- a/ethcore/private-tx/src/error.rs
+++ b/ethcore/private-tx/src/error.rs
@@ -25,7 +25,6 @@ use ethkey::Error as KeyError;
 use ethkey::crypto::Error as CryptoError;
 use txpool::VerifiedTransaction;
 use private_transactions::VerifiedPrivateTransaction;
-use serde_json::{Error as SerdeError};

 type TxPoolError = txpool::Error<<VerifiedPrivateTransaction as VerifiedTransaction>::Hash>;

@@ -46,9 +45,6 @@ pub enum Error {
 	/// Crypto error.
 	#[display(fmt = "Crypto Error {}", _0)]
 	Crypto(CryptoError),
-	/// Serialization error.
-	#[display(fmt = "Serialization Error {}", _0)]
-	Json(SerdeError),
 	/// Encryption error.
 	#[display(fmt = "Encryption error. ({})", _0)]
 	Encrypt(String),
@@ -103,15 +99,6 @@ pub enum Error {
 	/// Key server URL is not set.
 	#[display(fmt = "Key server URL is not set.")]
 	KeyServerNotSet,
-	/// Transaction not found in logs.
-	#[display(fmt = "Private transaction not found in logs.")]
-	TxNotFoundInLog,
-	/// Path for logging not set.
-	#[display(fmt = "Path for logging not set.")]
-	LoggingPathNotSet,
-	/// Timestamp overflow error.
-	#[display(fmt = "Timestamp overflow error.")]
-	TimestampOverflow,
 	/// VM execution error.
 	#[display(fmt = "VM execution error {}", _0)]
 	Execution(ExecutionError),
@@ -136,7 +123,6 @@ impl error::Error for Error {
 			Error::Decoder(e) => Some(e),
 			Error::Trie(e) => Some(e),
 			Error::TxPool(e) => Some(e),
-			Error::Json(e) => Some(e),
 			Error::Crypto(e) => Some(e),
 			Error::Execution(e) => Some(e),
 			Error::Key(e) => Some(e),
@@ -201,12 +187,6 @@ impl From<TxPoolError> for Error {
 	}
 }

-impl From<SerdeError> for Error {
-	fn from(err: SerdeError) -> Self {
-		Error::Json(err).into()
-	}
-}
-
 impl From<EthcoreError> for Error {
 	fn from(err: EthcoreError) -> Self {
 		Error::Ethcore(err).into()
--- a/ethcore/private-tx/src/key_server_keys.rs
+++ b/ethcore/private-tx/src/key_server_keys.rs
@@ -29,15 +29,15 @@ use_contract!(keys_acl_contract, "res/keys_acl.json");

 /// Returns the address (of the contract), that corresponds to the key
 pub fn key_to_address(key: &H256) -> Address {
-	Address::from_slice(&key.as_bytes()[..10])
+	Address::from_slice(&key.to_vec()[..10])
 }

 /// Returns the key from the key server associated with the contract
 pub fn address_to_key(contract_address: &Address) -> H256 {
 	// Current solution uses contract address extended with 0 as id
-	let contract_address_extended: H256 = (*contract_address).into();
+	let contract_address_extended: H256 = contract_address.into();

-	H256::from_slice(contract_address_extended.as_bytes())
+	H256::from_slice(&contract_address_extended)
 }

 /// Trait for keys server keys provider.
@@ -118,7 +118,7 @@ impl Default for StoringKeyProvider {
 	fn default() -> Self {
 		StoringKeyProvider {
 			available_keys: RwLock::new(None),
-			key_server_account: Some(Address::zero()),
+			key_server_account: Some(Address::default()),
 		}
 	}
 }
@@ -170,4 +170,4 @@ mod tests {
 		keys_data.update_acl_contract();
 		assert_eq!(keys_data.keys_acl_contract.read().unwrap(), key.address());
 	}
-}
+}
--- a/ethcore/private-tx/src/lib.rs
+++ b/ethcore/private-tx/src/lib.rs
@@ -16,12 +16,15 @@

 //! Private transactions module.

+// Recursion limit required because of
+// error_chain foreign_links.
+#![recursion_limit="256"]
+
 mod encryptor;
 mod key_server_keys;
 mod private_transactions;
 mod messages;
 mod error;
-mod log;

 extern crate common_types as types;
 extern crate ethabi;
@@ -34,7 +37,7 @@ extern crate ethjson;
 extern crate ethkey;
 extern crate fetch;
 extern crate futures;
-extern crate parity_util_mem;
+extern crate heapsize;
 extern crate keccak_hash as hash;
 extern crate parity_bytes as bytes;
 extern crate parity_crypto as crypto;
@@ -42,15 +45,11 @@ extern crate parking_lot;
 extern crate trie_db as trie;
 extern crate patricia_trie_ethereum as ethtrie;
 extern crate rlp;
-#[macro_use]
-extern crate serde_derive;
-extern crate serde;
-extern crate serde_json;
 extern crate rustc_hex;
 extern crate transaction_pool as txpool;
 extern crate url;
 #[macro_use]
-extern crate log as ethlog;
+extern crate log;
 #[macro_use]
 extern crate ethabi_derive;
 #[macro_use]
@@ -59,9 +58,6 @@ extern crate derive_more;
 #[macro_use]
 extern crate rlp_derive;

-#[cfg(not(time_checked_add))]
-extern crate time_utils;
-
 #[cfg(test)]
 extern crate rand;
 #[cfg(test)]
@@ -72,11 +68,10 @@ pub use key_server_keys::{KeyProvider, SecretStoreKeys, StoringKeyProvider};
 pub use private_transactions::{VerifiedPrivateTransaction, VerificationStore, PrivateTransactionSigningDesc, SigningStore};
 pub use messages::{PrivateTransaction, SignedPrivateTransaction};
 pub use error::Error;
-pub use log::{Logging, TransactionLog, ValidatorLog, PrivateTxStatus, FileLogsSerializer};

 use std::sync::{Arc, Weak};
 use std::collections::{HashMap, HashSet, BTreeMap};
-use ethereum_types::{H128, H256, U256, Address, BigEndianHash};
+use ethereum_types::{H128, H256, U256, Address};
 use hash::keccak;
 use rlp::*;
 use parking_lot::RwLock;
@@ -122,8 +117,6 @@ pub struct ProviderConfig {
 	pub validator_accounts: Vec<Address>,
 	/// Account used for signing public transactions created from private transactions
 	pub signer_account: Option<Address>,
-	/// Path to private tx logs
-	pub logs_path: Option<String>,
 }

 #[derive(Debug)]
@@ -184,7 +177,6 @@ pub struct Provider {
 	accounts: Arc<Signer>,
 	channel: IoChannel<ClientIoMessage>,
 	keys_provider: Arc<KeyProvider>,
-	logging: Option<Logging>,
 }

 #[derive(Debug)]
@@ -219,7 +211,6 @@ impl Provider {
 			accounts,
 			channel,
 			keys_provider,
-			logging: config.logs_path.map(|path| Logging::new(Arc::new(FileLogsSerializer::with_path(path)))),
 		}
 	}

@@ -266,11 +257,8 @@ impl Provider {
 		trace!(target: "privatetx", "Required validators: {:?}", contract_validators);
 		let private_state_hash = self.calculate_state_hash(&private_state, contract_nonce);
 		trace!(target: "privatetx", "Hashed effective private state for sender: {:?}", private_state_hash);
-		self.transactions_for_signing.write().add_transaction(private.hash(), signed_transaction, &contract_validators, private_state, contract_nonce)?;
+		self.transactions_for_signing.write().add_transaction(private.hash(), signed_transaction, contract_validators, private_state, contract_nonce)?;
 		self.broadcast_private_transaction(private.hash(), private.rlp_bytes());
-		if let Some(ref logging) = self.logging {
-			logging.private_tx_created(&tx_hash, &contract_validators);
-		}
 		Ok(Receipt {
 			hash: tx_hash,
 			contract_address: contract,
@@ -281,10 +269,9 @@ impl Provider {
 	/// Calculate hash from united private state and contract nonce
 	pub fn calculate_state_hash(&self, state: &Bytes, nonce: U256) -> H256 {
 		let state_hash = keccak(state);
-		let nonce_h256: H256 = BigEndianHash::from_uint(&nonce);
 		let mut state_buf = [0u8; 64];
-		state_buf[..32].clone_from_slice(state_hash.as_bytes());
-		state_buf[32..].clone_from_slice(nonce_h256.as_bytes());
+		state_buf[..32].clone_from_slice(&state_hash);
+		state_buf[32..].clone_from_slice(&H256::from(nonce));
 		keccak(&state_buf.as_ref())
 	}

@@ -367,9 +354,8 @@ impl Provider {
 			Some(desc) => desc,
 		};
 		let last = self.last_required_signature(&desc, signed_tx.signature())?;
-		let original_tx_hash = desc.original_transaction.hash();

-		if last.0 {
+		if last {
 			let mut signatures = desc.received_signatures.clone();
 			signatures.push(signed_tx.signature());
 			let rsv: Vec<Signature> = signatures.into_iter().map(|sign| sign.into_electrum().into()).collect();
@@ -387,8 +373,8 @@ impl Provider {
 			trace!(target: "privatetx", "Last required signature received, public transaction created: {:?}", public_tx);
 			// Sign and add it to the queue
 			let chain_id = desc.original_transaction.chain_id();
-			let public_tx_hash = public_tx.hash(chain_id);
-			let signature = self.accounts.sign(signer_account, public_tx_hash)?;
+			let hash = public_tx.hash(chain_id);
+			let signature = self.accounts.sign(signer_account, hash)?;
 			let signed = SignedTransaction::new(public_tx.with_signature(signature, chain_id))?;
 			match self.miner.import_own_transaction(&*self.client, signed.into()) {
 				Ok(_) => trace!(target: "privatetx", "Public transaction added to queue"),
@@ -406,11 +392,6 @@ impl Provider {
 					Err(err) => warn!(target: "privatetx", "Failed to send private state changed notification, error: {:?}", err),
 				}
 			}
-			// Store logs
-			if let Some(ref logging) = self.logging {
-				logging.signature_added(&original_tx_hash, &last.1);
-				logging.tx_deployed(&original_tx_hash, &public_tx_hash);
-			}
 			// Remove from store for signing
 			if let Err(err) = self.transactions_for_signing.write().remove(&private_hash) {
 				warn!(target: "privatetx", "Failed to remove transaction from signing store, error: {:?}", err);
@@ -419,12 +400,7 @@ impl Provider {
 		} else {
 			// Add signature to the store
 			match self.transactions_for_signing.write().add_signature(&private_hash, signed_tx.signature()) {
-				Ok(_) => {
-					trace!(target: "privatetx", "Signature stored for private transaction");
-					if let Some(ref logging) = self.logging {
-						logging.signature_added(&original_tx_hash, &last.1);
-					}
-				}
+				Ok(_) => trace!(target: "privatetx", "Signature stored for private transaction"),
 				Err(err) => {
 					warn!(target: "privatetx", "Failed to add signature to signing store, error: {:?}", err);
 					return Err(err);
@@ -444,14 +420,17 @@ impl Provider {
 		}
 	}

-	fn last_required_signature(&self, desc: &PrivateTransactionSigningDesc, sign: Signature) -> Result<(bool, Address), Error>  {
+	fn last_required_signature(&self, desc: &PrivateTransactionSigningDesc, sign: Signature) -> Result<bool, Error>  {
+		if desc.received_signatures.contains(&sign) {
+			return Ok(false);
+		}
 		let state_hash = self.calculate_state_hash(&desc.state, desc.contract_nonce);
 		match recover(&sign, &state_hash) {
 			Ok(public) => {
 				let sender = public_to_address(&public);
 				match desc.validators.contains(&sender) {
 					true => {
-						Ok((desc.received_signatures.len() + 1 == desc.validators.len(), sender))
+						Ok(desc.received_signatures.len() + 1 == desc.validators.len())
 					}
 					false => {
 						warn!(target: "privatetx", "Sender's state doesn't correspond to validator's");
@@ -478,13 +457,13 @@ impl Provider {

 	fn iv_from_transaction(transaction: &SignedTransaction) -> H128 {
 		let nonce = keccak(&transaction.nonce.rlp_bytes());
-		let (iv, _) = nonce.as_bytes().split_at(INIT_VEC_LEN);
+		let (iv, _) = nonce.split_at(INIT_VEC_LEN);
 		H128::from_slice(iv)
 	}

 	fn iv_from_address(contract_address: &Address) -> H128 {
 		let address = keccak(&contract_address.rlp_bytes());
-		let (iv, _) = address.as_bytes().split_at(INIT_VEC_LEN);
+		let (iv, _) = address.split_at(INIT_VEC_LEN);
 		H128::from_slice(iv)
 	}

@@ -533,8 +512,8 @@ impl Provider {
 		// Sort the storage to guarantee the order for all parties
 		let sorted_storage: BTreeMap<&H256, &H256> = storage.iter().collect();
 		for (key, value) in sorted_storage {
-			raw.extend_from_slice(key.as_bytes());
-			raw.extend_from_slice(value.as_bytes());
+			raw.extend_from_slice(key);
+			raw.extend_from_slice(value);
 		};
 		raw
 	}
@@ -618,8 +597,8 @@ impl Provider {
 				v[31] = s.v();
 				v
 			}).collect::<Vec<[u8; 32]>>(),
-			signatures.iter().map(|s| H256::from_slice(s.r())).collect::<Vec<H256>>(),
-			signatures.iter().map(|s| H256::from_slice(s.s())).collect::<Vec<H256>>(),
+			signatures.iter().map(|s| s.r()).collect::<Vec<&[u8]>>(),
+			signatures.iter().map(|s| s.s()).collect::<Vec<&[u8]>>()
 		)
 	}

@@ -695,14 +674,6 @@ impl Provider {
 		Ok(result.result)
 	}

-	/// Retrieves log information about private transaction
-	pub fn private_log(&self, tx_hash: H256) -> Result<TransactionLog, Error> {
-		match self.logging {
-			Some(ref logging) => logging.tx_log(&tx_hash).ok_or(Error::TxNotFoundInLog),
-			None => Err(Error::LoggingPathNotSet),
-		}
-	}
-
 	/// Returns private validators for a contract.
 	pub fn get_validators(&self, block: BlockId, address: &Address) -> Result<Vec<Address>, Error> {
 		let (data, decoder) = private_contract::functions::get_validators::call();
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
s3krit	3fd58bdcbd	Beta 2.5.3 (#10776 ) * ethcore/res: activate atlantis classic hf on block 8772000 (#10766) * fix docker tags for publishing (#10741) * fix: aura don't add `SystemTime::now()` (#10720) This commit does the following: - Prevent overflow in `verify_timestamp()` by not adding `now` to found faulty timestamp - Use explicit `CheckedSystemTime::checked_add` to prevent potential consensus issues because SystemTime is platform depedent - remove `#[cfg(not(time_checked_add))]` conditional compilation * Update version * Treat empty account the same as non-exist accounts in EIP-1052 (#10775) * DevP2p: Get node IP address and udp port from Socket, if not included in PING packet (#10705) * get node IP address and udp port from Socket, if not included in PING packet * prevent bootnodes from being added to host nodes * code corrections * code corrections * code corrections * code corrections * docs * code corrections * code corrections * Apply suggestions from code review Co-Authored-By: David <dvdplm@gmail.com> * Add a way to signal shutdown to snapshotting threads (#10744) * Add a way to signal shutdown to snapshotting threads * Pass Progress to fat_rlps() so we can abort from there too. * Checking for abort in a single spot * Remove nightly-only weak/strong counts * fix warning * Fix tests * Add dummy impl to abort snapshots * Add another dummy impl for TestSnapshotService * Remove debugging code * Return error instead of the odd Ok(()) Switch to AtomicU64 * revert .as_bytes() change * fix build * fix build maybe	2019-06-25 13:38:29 +00:00
Talha Cross	ecbafb2390	backports for beta 2.5.2 (#10737 ) * version: bump beta to 2.5.2 * [CI] allow cargo audit to fail (#10676) * [CI] allow cargo audit to fail * [.gitlab-ci.yml] add a comment about cargo audit * [Cargo.lock] cargo update -p protobuf * Reset blockchain properly (#10669) * delete BlockDetails from COL_EXTRA * better proofs * added tests * PR suggestions * new image (#10673) * Update publishing (#10644) * docker images are now built on k8s: test run * copy check_sync.sh in build-linux job * copy scripts/docker/hub/* in build-linux job * removed cache var * cleanup, no more nightly dockers * cleanup in dockerfile * some new tags * removed sccsche debug log, cleanup * no_gits, new artifacts dir, changed scripts. Test run. * define version once * one source for TRACK * stop kovan onchain updates * moved changes for two images to a new branch * rename Dockerfile * no need in libudev-dev * enable lto for release builds (#10717) * Use RUSTFLAGS to set the optimization level (#10719) * Use RUSTFLAGS to set the optimization level Cargo has a [quirk]() in how configuration settings are propagated when `cargo test` runs: local code respect the settings in `[profile.test]` but all dependencies use the `[profile.dev]` settings. Here we force `opt-level=3` for all dependencies. * Remove unused profile settings * Maybe like this? * Turn off incremental compilation * Remove colors; try again with overflow-checks on * Use quiet CI machine * Turn overflow checking back on * Be explicit about what options we use * Remove "quiet machine" override * ethcore: enable ECIP-1054 for classic (#10731) * config: enable atlantis on ethereum classic * config: enable atlantis on morden classic * config: enable atlantis on morden classic * config: enable atlantis on kotti classic * ethcore: move kotti fork block to 0xAEF49 * ethcore: move morden fork block to 0x4829BA * ethcore: move classic fork block to 0x81B320 * remove trailing comma * remove trailing comma * fix chainspec * ethcore: move classic fork block to 0x7fffffffffffffff	2019-06-11 20:56:03 +02:00
Talha Cross	adabd8198c	beta ci: backport missing diff from master (#10661 ) * ci: publish docs debug (#10638) * ci: backport missing diff from master	2019-05-14 15:03:29 +02:00
Talha Cross	c2487cfe07	ci: publish docs debug (#10638 ) (#10660 )	2019-05-14 14:04:54 +02:00
Talha Cross	e0141f8324	beta 2.5.1 (#10643 ) * version: bump beta to 2.5.1 * fix(whisper expiry): current time + work + ttl (#10587) * update bootnodes (#10595) * config: update goerli bootnodes * config: update kotti bootnodes * adds rpc error message for --no-ancient-blocks (#10608) * adds error message for --no-ancient-blocks, closes #10261 * Apply suggestions from code review Co-Authored-By: seunlanlege <seunlanlege@gmail.com> * Constantinople HF on POA Core (#10606) * Constantinople HF on POA Core Plan Constantinople/St.Petersfork HF on POA Core network at block 8582254. Original PR in POA repository: https://github.com/poanetwork/poa-chain-spec/pull/110 * Remove extra empty line * evm: add some mulmod benches (#10600) * evm: add blockhash_mulmod bench * evm: use num-bigint for mod ops * Clique: zero-fill extradata when the supplied value is less than 32 bytes in length (#10605) * Update kovan.json to switch validator set to POA Consensus Contracts (#10628) * Fix publish docs (#10635) * Fix publish docs * this never should be forced, either way compiling previous versions will produce outdated docs * fix array, var was moved to the group project global variables list * Fix rinkeby petersburg fork (#10632)	2019-05-10 13:48:52 +02:00
Talha Cross	b52ac20660	beta backports (#10576 ) * Reject crazy timestamps instead of truncating. * fix(light cull): poll light cull instead of timer (#10559) * fix(light cull): poll light cull instead of timer * fix(grumbles): remove error + updated docs * fix(on-demand request): `expect()` reason * docs(remove misleading info)	2019-04-08 11:44:10 +02:00
soc1c	3c85f29f11	version: betalize 2.5	2019-04-02 09:37:43 +02:00