{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_signTypedData_v4",
  "params": [
    "0x3b7252d007059ffc82d16d022da3cbf9992d2f70",
    {
      "types": {
        "EIP712Domain": [
          { "name": "name", "type": "string" },
          { "name": "version", "type": "string" },
          { "name": "chainId", "type": "uint256" },
          { "name": "verifyingContract", "type": "address" }
        ],
        "Person": [
          { "name": "name", "type": "string" },
          { "name": "wallet", "type": "address" }
        ]
      },
      "primaryType": "Person",
      "domain": {
        "name": "Example App",
        "version": "1",
        "chainId": 1,
        "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "name": "Alice",
        "wallet": "0x3b7252d007059ffc82d16d022da3cbf9992d2f70"
      }
    }
  ]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x4355c47d63924e8a72e509b65029052eb6c299d53a04e167c5775fd466751c9d07299936d304c153f6443dfa05f40ff007d72911b6f72307f996231605b915621c"
}

Defined in EIP-712

Signs structured data according to EIP-712, which provides a more secure way to sign data by providing context and structure to the data being signed.

​
Parameters

​
address
string
required

The address that should sign the data (20 bytes).

​
typedData
object
required

The typed structured data to be signed.

​
Returns

​
result
string

The signature as a hexadecimal string.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_signTypedData_v4",
  "params": [
    "0x3b7252d007059ffc82d16d022da3cbf9992d2f70",
    {
      "types": {
        "EIP712Domain": [
          { "name": "name", "type": "string" },
          { "name": "version", "type": "string" },
          { "name": "chainId", "type": "uint256" },
          { "name": "verifyingContract", "type": "address" }
        ],
        "Person": [
          { "name": "name", "type": "string" },
          { "name": "wallet", "type": "address" }
        ]
      },
      "primaryType": "Person",
      "domain": {
        "name": "Example App",
        "version": "1",
        "chainId": 1,
        "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "name": "Alice",
        "wallet": "0x3b7252d007059ffc82d16d022da3cbf9992d2f70"
      }
    }
  ]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x4355c47d63924e8a72e509b65029052eb6c299d53a04e167c5775fd466751c9d07299936d304c153f6443dfa05f40ff007d72911b6f72307f996231605b915621c"
}

​
Error Handling

CodeMessageDescription
4001User rejected the requestUser denied the signing request
4100Requested method not supportedThe method is not supported by the wallet
-32602Invalid paramsInvalid typed data structure

Always validate the domain and verifying contract address to prevent signature replay attacks.

EIP-712 signatures provide better security than personal_sign by giving users context about what they’re signing.