Thanks @sin for help with this proposal to keep ERC1271 signatures valid, even after key rotation. Could be especially useful for off-chain attestations from AA wallets.

https://ethereum-magicians.org/t/erc1271-versioning-to-maintain-signature-validity/19681/

Feedback appreciated!

As we transition to smart contract wallets and other designs with rotatable signers, how do we ensure the validity of offchain signatures from the past?

@kylekaplan has an interesting proposal for an extension to EIP1271 that may do the trick!