A group of protocol engineers and security researchers published a draft standard for cross-chain messages, motivated by the pattern behind most large bridge losses.
Reviewing past incidents, the authors found the recurring failures were missing replay protection, ambiguous verifier sets and messages that stayed valid indefinitely.
The specification requires each message to declare its verifier set explicitly and to expire after a stated block height, so stale approvals cannot be resurrected.
Implementers note the format adds bytes to every message, which is a real cost on chains where calldata remains expensive.
Two bridge operators said they will trial the format on testnet, and the authors have opened a public comment period before finalising the draft.
