union README

The project's README from github.com/unionlabs/union. As one markdown file: README.md.

Union

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Union is the hyper-efficient zero-knowledge infrastructure layer for general message passing, asset transfers, NFTs, and DeFi. Its based on Consensus Verification and has no dependencies on trusted third parties, oracles, multi-signatures or MPC. It implements IBC for compatibility with Cosmos chains and connects to EVM chains like Ethereum, Berachain (beacon-kit), Arbitrum, and more.

The upgradability of contracts on other chains, connections, token configurations, and evolution of the protocol will all be controlled by decentralized governance, aligning the priorities of Union with its users, validators, and operators.

Components

Component Description Language(s)
uniond The Union node implementation, using CometBLS Go
galoisd The zero-knowledge prover implementation Go Gnark
voyager Modular hyper-performant cross-ecosystem relayer Rust
cosmwasm CosmWasm smart contract stack Rust
light-clients Light Clients for various ecosystems Rust
unionvisor Node supervisor intended for production usage Rust
drip Faucet for Cosmos chains: app.union.build/faucet Rust
evm EVM smart contract stack Solidity
app app.union.build TypeScript Svelte
site union.build TypeScript Astro
TypeScript SDK TypeScript SDK for interacting with Union TypeScript

Quickstart

Install Nix to reproducibly build any component, and to enter a dev shell with all dependencies:

curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install

(Note that some components can only be built on Linux. If you are using macOS, we recommend using OrbStack to easily set up a NixOS VM within two minutes. Most Union developers use macOS with OrbStack, and there is no need to install Nix inside of the NixOS VM.)

You can now reproducibly build any of Union's components from source:

nix build .#uniond -L
nix build .#voyager -L
nix build .#app -L

# to see all packages, run:
nix flake show

The result of whatever you build will be in result/

You can now also enter our dev shell, which has all of the dependencies (cargo, rustc, node, go, etc.) you need to work on any component: (Don't worry, this will not affect your system outside of this repo)

nix develop

Run the following to format the entire repo and check your spelling before each PR:

nix run .#pre-commit -L

Check the #developers channel on Union's discord if you need any help with this.

Supported Chains

Network Mainnets Testnets
Arbitrum arbitrum.42161 arbitrum.421614
Babylon babylon.bbn-1 babylon.bbn-test-6
Base base.8453 base.84532
Berachain berachain.80094 berachain.80069
Bob bob.60808 bob.808813
BSC bsc.56 bsc.97
Corn corn.21000000 corn.21000001
Ethereum ethereum.1 ethereum.11155111, ethereum.560048
Osmosis osmosis.osmosis-1 osmosis.osmo-test-5
Sei sei.pacific-1, sei.1329 sei.atlantic-2, sei.1328
Sui - sui.4c78adac
Union union.union-1 union.union-testnet-10
Xion xion.xion-mainnet-1 xion.xion-testnet-2

For the full list see https://docs.union.build/ucs/04/

Docs

The official docs are hosted here. Each individual component also has accompanying developer documentation for contributors, which you can find in each README.md.

union (unionlabs/union)

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73.7K ·GitHub
Union
What is this?Union is a zero-knowledge bridging protocol that lets you pass messages, transfer assets and NFTs, and use DeFi across Cosmos chains and EVM chains like Ethereum, without relying on oracles, multi-signatures, or trusted third parties.
Is this one app or a collection of components?It's a monorepo of many components: a Cosmos node (uniond), a ZK prover (galoisd), a relayer (voyager), CosmWasm and EVM smart contracts, light clients, a faucet, a web app, and a TypeScript SDK.
How do I get it running for development?Install Nix, which gives you reproducible builds of any component and a dev shell with all needed tools (cargo, rustc, node, go, etc.) pre-installed.
Do I need anything besides Nix to build this?No, Nix alone pulls in the full toolchain (cargo, rustc, node, go), so you don't need to separately install Rust, Go, or Node.
Can I build everything on macOS?Not directly — some components only build on Linux, so Mac users are advised to run a NixOS VM via OrbStack rather than building natively.
Which chains can I bridge between right now?Mainnet and testnet support is live for Arbitrum, Babylon, Base, Berachain, Bob, BSC, Corn, Ethereum, Osmosis, Sei, Sui, Union, and Xion, with the full list tracked separately in the repo.
What makes Union different from other bridges?It uses consensus verification and zero-knowledge proofs via its own prover (galoisd) and CometBLS consensus instead of oracles, multisigs, or MPC, and implements IBC for native Cosmos compatibility.
What is voyager?Voyager is Union's modular, high-performance cross-ecosystem relayer written in Rust, responsible for moving IBC packets between connected chains.
Is there a faucet for testing?Yes, 'drip' is a Rust-based faucet for Cosmos chains, available at app.union.build/faucet.
What are similar projects?go-ethereum, nuvex-services, openzeppelin-contracts, shardeum, foundry, hashsigs-solidity, fhevm, solidity
Which topics is it in?zero-knowledge, interoperability, evm, solidity, nix, astro, ethereum, smart-contracts, svelte, decentralized, cryptocurrency, web3
Creator
unionlabs
Size
473.9 MB
Stars
73.7K
Updated
CommitJul 25Releasebundle-union-1/v1.2.3Jan 26
Age
3y
Commits · 90 Days