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Union Build: Zero-Knowledge Interoperability at the Modular Edge

Union Build: Zero-Knowledge Interoperability at the Modular Edge

Blockchains are excellent at verifying their own state. But when they need to talk to other chains, things fall apart. We rely on multisigs, bridges, and trust assumptions that break under scale.

Union Build is solving this with zero-knowledge proof systems, validator-based consensus, and a modular architecture purpose-built for the multi-chain future. It’s not a bridge.It’s an interoperability protocol engineered to make blockchains communicate like peers, not strangers.

What Is Union Build?

Union Build is an open, ZK-powered interoperability layer that enables trustless cross-chain messaging and asset transfer across EVM, IBC, Cosmos, and other ecosystems with near-zero latency.

Its modular stack includes:

  • CometBLS: A BLS-based consensus engine that efficiently verifies validator sets
  • Galois: A fast ZK prover stack optimized for consensus proofs
  • Voyager: The relayer that pushes validated messages across chains
  • Light Clients: For verifying cross-chain state in smart contracts

Instead of relying on external oracles or multisigs, Union uses on-chain consensus verification. The proof of what happened is generated cryptographically and accepted permissionlessly.

Why This Matters for Modular Ecosystems

The Mitosis ecosystem is built around interoperability, composability, and capital-efficient cross-chain UX.

Union Build shares these same values:

  • Modularity: You can upgrade parts (relayers, provers, consensus engines) without affecting the full stack
  • Composable: Developers can plug Union into existing apps, wallets, or chains without permission
  • Secure-by-design: No third-party trust assumptions. Messages are accepted only if they pass native chain consensus

That makes it a powerful infrastructure layer for rollups, app-chains, and liquidity protocols looking to interoperate securely.

A Real-World Example

Imagine you’re building a DEX that spans multiple chains. With Union Build, you can:

  • Set up a light client on Ethereum that watches Cosmos validator consensus
  • Send messages from Osmosis to Ethereum, verified through a ZK proof
  • Execute trades, governance calls, or even NFT bridging trustlessly and instantly

You don’t need centralized relayers. You don’t need custom wrappers. You don’t even need to wait minutes.

This is interoperability as protocol not product.

Current Status

Union Build is now in V2.5 testnet, featuring:

  • Testable validator sets
  • ZK prover benchmarks
  • Permissionless relayer infrastructure
  • Live dashboards and SDKs

Developers can begin integrating Union into rollups, EVM dApps, or Cosmos modules using their open-source codebase and detailed docs.

And yes the trusted setup ceremony already happened, with one of the largest contributor counts in ZK history.

Internal Glossary Links (Mitosis University)


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