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EIP 712: Ethereum typed structured data hashing and signing (DRAFT)

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Note: The following is an excerpt from the official Ethereum site. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.
Table 1: Data sheet for Ethereum typed structured data hashing and signing
Title Ethereum typed structured data hashing and signing
Author Remco Bloemen, Leonid Logvinov, Jacob Evans
Status Draft
Created 2017-09-12
Category Interface
Requires EIP155, EIP191

Simple Summary

Signing data is a solved problem if all we care about are bytestrings. Unfortunately in the real world we care about complex meaningful messages. Hashing structured data is non-trivial and errors result in loss of the security properties of the system.

As such, the adage “don’t roll your own crypto” applies. Instead, a peer-reviewed well-tested standard method needs to be used. This EIP aims to be that standard.


This is a standard for hashing and signing of typed structured data as opposed to just bytestrings. It includes a

  • theoretical framework for correctness of encoding functions,
  • specification of structured data similar to and compatible with Solidity structs,
  • safe hashing algorithm for instances of those structures,
  • safe inclusion of those instances in the set of signable messages,
  • an extensible mechanism for domain separation,
  • new RPC call eth_signTypedData, and
  • an optimized implementation of the hashing algorithm in EVM.

It does not include replay protection.

dido/public/ra/xapend/xapend.b_stds/defact/ethereum/eip/erc_0712.txt · Last modified: 2020/11/13 02:21 by nick
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