Deep Dive
1. V4 Launch with ZK Proofs (July 2025)
Overview: This major version introduced a new cross-chain architecture that uses zero-knowledge proofs (ZKPs) to verify transactions. For users, this means the bridge can securely expand to many more blockchains without relying on custom, potentially risky adapters.
The update shifts from chain-specific verification to a universal pipeline. Relayer repayments are now proven on Ethereum and that proof is verified on destination chains using a generic stack of contracts. This eliminates the need for custom bridges for each new chain.
What this means: This is bullish for ACX because it makes the protocol more scalable and secure. It reduces integration overhead for new chains, potentially leading to faster expansion and a more robust network. The underlying technology also reinforces Ethereum's role as the security backbone.
(Across)
2. Non-EVM and Prefills Upgrade (Jan 2025)
Overview: This upgrade enabled Across to support non-EVM chains (like Solana) and introduced "prefill" flows, where users can receive funds almost instantly, before the deposit is fully confirmed on-chain.
The changes involved significant breaking updates to smart contract events and method signatures to handle the new logic. Integrators were required to update their code, but the migration was designed to require no network downtime.
What this means: This is bullish for ACX because it directly expands the protocol's addressable market and significantly improves user experience. Faster transactions and support for major new ecosystems can drive higher adoption and volume.
(Across Forum)
Conclusion
The trajectory of Across's codebase shows a clear focus on scalability through modular architecture (V4) and user experience via faster transactions (Prefills). How will these technical foundations influence its competitive edge as institutional adoption grows?