Revoke a previously registered signer key. Requires account EIP-712 signature:

Account signs RevokeSigner:

RevokeSigner(address account,address signer,uint48 nonceAnchor,uint8 nonceBitmap)

Struct hash: keccak256(abi.encode(TYPEHASH, account, signer, nonceAnchor, nonceBitmap))

The type string is hashed literally, so it must be copied verbatim — a single added space yields a different typehash and the signature will not recover.