Union

The Union network is a hyper-efficient zero-knowledge infrastructure layer for general message passing, asset transfers, NFTs, and DeFi. It’s based on consensus verification and has no dependencies on trusted third parties, oracles, multi-signatures, or MPC.

Seed Round: $4M

Series A Round: $12M

Testnet guide

Whitepaper

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What is Union

Union is a cutting-edge project in the blockchain space focused on creating a hyper-efficient, zero-knowledge interoperability layer. It’s designed to connect various blockchain networks—such as appchains, Layer 1s, and Layer 2s—enabling seamless communication, asset transfers, and decentralized finance (DeFi) applications across ecosystems. The core idea is to break down the barriers between fragmented blockchain networks, making it easier for developers and users to interact with multiple chains without the usual bottlenecks.

At its heart, Union leverages zero-knowledge proofs (ZKPs), a type of cryptography that ensures secure and private verification of transactions or states without revealing unnecessary details. This is paired with a consensus mechanism called CometBLS, an enhanced version of Tendermint tailored for fast and scalable cross-chain bridging. Union’s approach eliminates reliance on trusted third parties, oracles, or multi-signature schemes, aiming for a trustless and censorship-resistant infrastructure. It supports a variety of use cases, like transferring assets (including NFTs), passing messages between chains, and integrating protocols across ecosystems—think decentralized exchanges or lending platforms working together effortlessly.

The project is modular, meaning developers can pick and choose components to suit their needs, and it’s open-source, encouraging community contribution and customization. Union integrates with major blockchain environments, including Ethereum, Cosmos (via the IBC protocol), and others, and has partnered with players like Polygon’s AggLayer to expand its reach.