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README.md

Hyperledger Burrow

CI version GoDoc license LoC codecov

Hyperledger Burrow is a permissioned Ethereum smart-contract blockchain node. It executes Ethereum EVM and WASM smart contract code (usually written in Solidity) on a permissioned virtual machine. Burrow provides transaction finality and high transaction throughput on a proof-of-stake Tendermint consensus engine.

burrow logo

What is Burrow

Burrow is a fully fledged blockchain node and smart contract execution engine -- a distributed database that executes code. Burrow runs Ethereum Virtual Machine (EVM) and Web Assembly (WASM) smart contracts. Burrow networks are synchronised using the Tendermint consensus algorithm.

Highlights include:

  • Tamper-resistant merkle state - a node can detect if its state is corrupted or if a validator is dishonestly executing the protocol.
  • Proof-of-stake support - run a private or public permissioned network.
  • On-chain governance primitives - stakeholders may vote for autonomous smart contract upgrades.
  • Ethereum account world-view - state and code is organised into cryptographically-addressable accounts.
  • Low-level permissioning - code execution permissions can be set on a per-account basis.
  • Event streaming - application state is organised in an event stream and can drive external systems.
  • SQL mapping layer - map smart contract event emissions to SQL tables using a projection specification.
  • GRPC interfaces - all RPC calls can be accessed from any language with GRPC support. Protobuf is used extensively for core objects.
  • Javascript client library - client library uses code generation to provide access to contracts via statically Typescript objects.
  • Keys service - provides optional delegating signing at the server or via a local proxy
  • Web3 RPC - provides compatibility for mainnet Ethereum tooling such as Truffle and Metamask

What it is not

  • An Ethereum mainnet client - we do not speak devp2p and various implementation details are different. We are Ethereum-derived but exploit greater freedom than mainnet compatibility would allow.
  • Just a virtual machine
  • A research project - we run it in production

Further introductory material

See Burrow - the Boring Blockchain for an introduction to Burrow and its motivating vision.

Watch the Boring into Burrow talk from the Hyperledger Global Forum 2020

JavaScript Client

There is a JavaScript API

Project Roadmap

Project information generally updated on a quarterly basis can be found on the Hyperledger Burrow Wiki.

Documentation

Burrow getting started documentation is available on the documentation site (source markdown files can be found in docs) and programmatic API in GoDocs.

Contribute

We welcome any and all contributions. Read the contributing file for more information on making your first Pull Request to Burrow!

You can find us on:

License

Apache 2.0

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