EIP-712 Signature Debug Tool

Auto-fill Features

• verifyingContract: Auto-filled from chainId
• makerAddress: Auto-derived from privateKey
• permit2WitnessType: Auto-generated from witnessStruct (EIP-712 alphabetical order)
• permit2Witness: Auto-calculated from witnessStruct

witnessStruct Format (Order 3/4)

// ExampleWitness(address user)
"witnessStruct": {
  "name": "ExampleWitness",
  "fields": [{ "type": "address", "name": "user" }],
  "values": { "user": "0x..." }
}

// Consideration(address token, uint256 amount, address counterparty)
"witnessStruct": {
  "name": "Consideration",
  "fields": [
    { "type": "address", "name": "token" },
    { "type": "uint256", "name": "amount" },
    { "type": "address", "name": "counterparty" }
  ],
  "values": { "token": "0x...", "amount": "100", "counterparty": "0x..." }
}