eth_signTypedData

Calculates an ethereum signature of the given typed structured data from the selected account.

Important

This method complies with the latest specification of EIP-712.

The document version used is commit 9e393a7.

Parameters​

Name	Type	Description
Account	Address	Account to sign from.
Data	MessagePayload | JSONString<MessagePayload>	Structured data to sign.

MessagePayload

// https://eips.ethereum.org/EIPS/eip-712#parameters
type MessagePayload = {
  domain: EIP712Domain;
  types: { EIP712Domain: EIP712Domain } & Record<string, TypedProperty[]>;
  primaryType: string;
  message: any;
};

// https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator
type EIP712Domain = {
  name?: string;
  version?: string;
  chainId?: Number<uint256>;
  verifyingContract?: Address;
  salt?: HexString<bytes32>;
};

// https://eips.ethereum.org/EIPS/eip-712#definition-of-typed-structured-data-%F0%9D%95%8A
type TypedProperty = {
  name: string;
  type: string;
};

Return Type​

HexString<Signature> - The ethereum ecdsa signature.

Example​

await provider.request({
  method: "eth_signTypedData",
  params: [
    "0x567d0382442c5178105fC03bd52b8Db6Afb4fE40",
    {
      types: {
        DeviceControl: [
          {
            name: "principal",
            type: "AuthorizedEntity",
          },
          {
            name: "emergency",
            type: "AuthorizedEntity",
          },
        ],
        AuthorizedEntity: [
          {
            name: "address",
            type: "address",
          },
          {
            name: "validUntil",
            type: "uint256",
          },
        ],
        EIP712Domain: [
          {
            name: "name",
            type: "string",
          },
          {
            name: "version",
            type: "string",
          },
          {
            name: "chainId",
            type: "uint256",
          },
          {
            name: "verifyingContract",
            type: "address",
          },
        ],
      },
      domain: {
        name: "Stargazer Demo",
        version: "1.0.0",
        chainId: "3",
        verifyingContract: "0xeb14c9bb6c2dec2ecb9b278c9fa1ec763b04d545",
      },
      primaryType: "DeviceControl",
      message: {
        principal: {
          address: "0xeb14c9bb6c2dec2ecb9b278c9fa1ec763b04d545",
          validUntil: "1657823568",
        },
        emergency: {
          address: "0xcac3da343670abb46bc6e8e6d375b66217519093",
          validUntil: "1752517998",
        },
      },
    },
  ],
});
// "0xa3f20717a250c2b0b729b7e5becbff67fdaef7e0699da4de7ca5895b02a170a12d887fd3b17bfdce3481f10bea41f45ba9f709d39ce8325427b57afcfc994cee1b"