# 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>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://nft-standards.gitbook.io/nft-standards-wiki/nft-security/eip712-ethereum-typed-structured-data-hashing-and-signing.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.