Multi-bridge Message Aggregation

Bridge world with MMA.

Multi-bridge Message Aggregation (MMA) is an additive security module for cross-chain communication. It utilizes multiple Arbitrary Messaging Bridges (AMB) to send messages from one EVM chain to another EVM chain.

Instead of relying on a single AMB, MMA allows the message sender to relay the message through multiple AMBs. This way, even if one AMB is exploited, no malicious actions can be executed on the destination chain.

This approach can offer the following key advantages:

1. Increases safety guarantees by verifying cross-chain messages across multiple bridges.

2. Improves liveness and censorship resistance guarantees by providing redundancy through multiple bridges.

3. Increases flexibility by allowing for a more seamless integration of new cross-chain protocols and a less disruptive phasing-out of defunct protocols over time. This also reduces vendor lock-in, especially when coupled with cross-chain standard interfaces such as ERC-5164.
4. Offers a common architecture for cross-chain governance across disparate Uniswap Protocol deployment chains. This can reduce friction, delays, and risk associated with new Uniswap Protocol deployments, as well as with proposing cross-chain governance actions.