Union

Union is a sophisticated cross-chain bridging protocol that leverages zero-knowledge cryptography to enable secure asset transfers between heterogeneous blockchain networks. Unlike traditional bridges that rely on trusted validators or multi-sig committees, Union uses cryptographic proofs to verify cross-chain state, dramatically reducing trust assumptions and attack surfaces.

The protocol supports a wide range of blockchain ecosystems including Ethereum, Cosmos, and Move-based chains, making it one of the most versatile interoperability solutions available. Built with Rust at its core, Union combines a high-performance prover, relayer infrastructure, and smart contracts written in Solidity, CosmWasm, and Move to create a unified bridging experience.

What sets Union apart is its focus on censorship resistance and security, making it particularly suitable for DeFi applications where trust minimization is critical. The protocol includes comprehensive indexing capabilities and developer tooling across multiple languages including TypeScript, Golang, and Rust, enabling teams to integrate cross-chain functionality without compromising on security or decentralization.

With a full-stack implementation spanning frontend (Svelte, Astro), backend infrastructure, and cryptographic components managed through Nix for reproducible builds, Union provides a production-ready solution for developers building the next generation of cross-chain applications.