Signature Type as an EIP standard

Hey all, we’re looking at how WalletConnect DApps can know when a signature was signed on behalf of a wallet contract by its owner address (so that a DApp can verify a signature accordingly via EIP-1271). Looking at solutions, we noticed that 0x uses a “Signature Type” byte appended to the end of a signature to inform the 0x contracts how the signature was signed.

Has this “Signature Type” mechanism been standardised via EIP? Are there plans to do so at all?

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We have now posted this as an EIP ->

Started a draft on hackmd