No support for off-chain signatures (EIP1271)

[tschubotz]

Problem summary

Many dapps rely on off-chain signatures. The Safe doesn't support contract signatures via EIP1271 yet.

Problem details

• Many dapps (e.g. cowswap or NFT platforms such as OpenSea, Rarible) leverage off-chain signatures instead of requiring on-chain txs for every user action to improve UX.
• The Safe as a smart contract wallet doesn't hold a single private key for signing.
• There is an EIP for allowing contract to sign: EIP1271
• The Safe supports EIP1271.
• The Safe interface doesn't expose this yet.
• The backend would need changes.
• We would need to design UI/UX for this.

Solution ideas

• Research UX of adding EIP1271 so we can do implementation in Q4.

[ennisjo]

We should monitor how the addition of signing support to safe-apps-sdk affects the priority of this issue, before pushing it to Q4 for development.

[billmcilhargey]

As a comment for feedback and determining priority:

This affects services like BSCScan items, for example, they are asking me to verify my multi-sig addresses to send them a signed message and this is a dependency that needs to be resolved before I can do that.

[musnit]

any updates/status of this? is anyone actively working on and/or thinking about this?

[cxn945]

Any updates on this feature? I have encountered this issue for text message signing.