EIP-712 Typed Data Hasher

Hash EIP-712 typed structured data online. Compute domain separator, struct hash, and final signing hash for permits and gasless transactions.

EIP-712 Typed Data (JSON)

{
  "types": {
    "EIP712Domain": [
      {
        "name": "name",
        "type": "string"
      },
      {
        "name": "version",
        "type": "string"
      },
      {
        "name": "chainId",
        "type": "uint256"
      },
      {
        "name": "verifyingContract",
        "type": "address"
      }
    ],
    "Permit": [
      {
        "name": "owner",
        "type": "address"
      },
      {
        "name": "spender",
        "type": "address"
      },
      {
        "name": "value",
        "type": "uint256"
      },
      {
        "name": "nonce",
        "type": "uint256"
      },
      {
        "name": "deadline",
        "type": "uint256"
      }
    ]
  },
  "primaryType": "Permit",
  "domain": {
    "name": "USD Coin",
    "version": "2",
    "chainId": 1,
    "verifyingContract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
  },
  "message": {
    "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "spender": "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45",
    "value": "1000000000",
    "nonce": "0",
    "deadline": "1716000000"
  }
}

Domain Separator (hashStruct of EIP712Domain)

0x06c37168a7db5138defc7866392bb87a741f9b3d104deb5094588ce041cae335

Struct Hash (hashStruct of message)

0x1e14b35ecf5ea2db97d5e65262a204c981a2b2180ac1510c000c0e9f4064c577

Final Signing Hash (keccak256(0x1901 + domainSep + structHash))

0xa6deb1abe0adce7ca4d937d799e0bcbe18b5708ed61eda32f6e0a9d652c4fd6c

Intermediate Values

Domain encodeType

EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)

Domain typeHash

0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f

Message encodeType

Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)

Message typeHash

0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9

What is EIP-712?

EIP-712 defines a standard for signing typed structured data in Ethereum, making signatures human-readable in wallets.
Permit (ERC-2612): Approve token spending via signatures instead of on-chain transactions, saving gas.
Gasless transactions: Users sign typed data off-chain; relayers submit transactions and pay gas.
Governance: Protocols like Compound use EIP-712 for off-chain vote signing.
Hash formula: keccak256("\x19\x01" || domainSeparator || hashStruct(message))

EIP-712 Typed Data Hasher

Intermediate Values

What is EIP-712?

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