EIP712 Ethereum typed structured data hashing and signing

712 can be used without 2612 712 defines a format for signatures 2612 defines a smart contract interface

Full implementation: https://eips.ethereum.org/EIPS/eip-712

EIP3074 relates to this EIP, discussion to EIP3074: https://ethereum-magicians.org/t/eip-3074-auth-and-authcall-opcodes/4880/34