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EVM Methods

Here we document the methods that an account Snap may implement to support requests originated from dapps.

✏️ Note: The methods described here may differ from the ones defined in the Ethereum JSON-RPC Specification or in MetaMask's API Reference.

personal_sign

Adds support to personal_sign.

Parameters (Array)

  1. Message to sign (required)
    • Type: string
    • Pattern: ^0x[0-9a-f]*$
  2. Account address (required)
    • Type: string
    • Pattern: ^0x[0-9a-fA-F]{40}$

Returns

  • Signature
    • Type: string
    • Pattern: ^0x[0-9a-f]{130}$

Example

Request:

{
  "method": "personal_sign",
  "params": [
    "0x4578616d706c652060706572736f6e616c5f7369676e60206d657373616765",
    "0x5874174dcf1ab6F7Efd8496f4f09404CD1c5bA84"
  ]
}

Response:

"0x262d12322b75228d09bbe3c104b91c1df32794126ce6a851e5c2721deb42d60e20b6eff3a1e2b5d29c2680edfb42e8497dbd7e75d0591a390a9385861b40f73d1c"

eth_sign

Adds support to eth_sign.

⚠️ Warning: Please read the following articles to understand the risks of using this method and its differences with personal_sign:

Parameters

  1. Account address (required)
    • Type: string
    • Pattern: ^0x[0-9a-fA-F]{40}$
  2. Hash to sign (required)
    • Type: string
    • Pattern: ^0x[0-9a-f]{64}$

Returns

  • Signature
    • Type: string
    • Pattern: ^0x[0-9a-f]{130}$

Example

Request:

{
  "method": "eth_sign",
  "params": [
    "0x5874174dcf1ab6f7efd8496f4f09404cd1c5ba84",
    "0x879a053d4800c6354e76c7985a865d2922c82fb5b3f4577b2fe08b998954f2e0"
  ]
}

Response:

"0xdc447c7a279a4b2114f453d2251a02904292652d37c8c220e92650429f1ef85230051830cef98de154fe0a52e3d2f308dd8b4e5045006482791bea0e5bbf79f71b"

eth_signTransaction

Adds support to eth_sendTransaction.

Parameters

  1. Transaction (required)
    • Type: object
    • Properties:
      • type:
        • Type: string
        • Pattern: ^0x[0-9a-fA-F]{1,2}$
      • nonce
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • to
        • One-of:
          • Contract creation
            • Type: null
          • Address:
            • Type: string
            • Pattern: ^0x[0-9a-fA-F]{40}$
      • from
        • Type: string
        • Pattern: ^0x[0-9a-fA-F]{40}$
      • value
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • data
        • Type: string
        • Pattern: ^0x[0-9a-f]*$
      • gasLimit
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • gasPrice
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • maxPriorityFeePerGas
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • maxFeePerGas
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$
      • accessList:
        • Description: EIP-2930 access list
        • Type: array
        • Items:
          • Type: object
          • Properties:
            • address
              • Type: string
              • Pattern: ^0x[0-9a-fA-F]{40}$
            • storageKeys
              • Type: array
              • Items:
                • Type: string
                • Pattern: ^0x[0-9a-f]{64}$
      • chainId
        • Type: string
        • Pattern: ^0x([1-9a-f][0-9a-f]*|0)$

Returns

  • Signature
    • Type: object
    • Properties:
      • v
        • Type: string
        • Pattern: ^0x[0-9a-f]{1,2}$
      • r
        • Type: string
        • Pattern: ^0x[0-9a-f]{64}$
      • s
        • Type: string
        • Pattern: ^0x[0-9a-f]{64}$

Example

EIP-1559 request:

{
  "method": "eth_signTransaction",
  "params": [
    {
      "type": "0x2",
      "nonce": "0x1",
      "to": "0x0c54fccd2e384b4bb6f2e405bf5cbc15a017aafb",
      "from": "0x660265edc169bab511a40c0e049cc1e33774443d",
      "value": "0x0",
      "data": "0x",
      "gasLimit": "0x5208",
      "maxPriorityFeePerGas": "0x3b9aca00",
      "maxFeePerGas": "0x2540be400",
      "accessList": [],
      "chainId": "0xaa36a7"
    }
  ]
}

Legacy request:

{
  "method": "eth_signTransaction",
  "params": [
    {
      "type": "0x0",
      "nonce": "0x0",
      "to": "0x0c54fccd2e384b4bb6f2e405bf5cbc15a017aafb",
      "from": "0x660265edc169bab511a40c0e049cc1e33774443d",
      "value": "0x0",
      "data": "0x",
      "gasLimit": "0x5208",
      "gasPrice": "0x2540be400",
      "chainId": "0xaa36a7"
    }
  ]
}

Response:

{
  "v": "0x1",
  "r": "0x51991c5099327d3c7eaa745de60c52a93555e5cbc418eb9b405fe92d986dee08",
  "s": "0x65b1d20a39360c31de69f872244e23a3549b702e11bc7d8eb3586812ac62be8d"
}

eth_signTypedData_v4

Adds support to eth_signtypeddata_v4.

✏️ Note: You can also implement support for eth_signTypedData_v1 and eth_signTypedData_v3, but they are deprecated.

In summary, the differences between the versions are:

  • V1 is based upon an early version of EIP-712 that lacked some later security improvements, and should generally be neglected in favor of later versions.

  • V3 is based on EIP-712, except that arrays and recursive data structures are not supported.

  • V4 is based on EIP-712, and includes full support of arrays and recursive data structures.

Parameters

  1. Account address (required)
    • Type: string
    • Pattern: ^0x[0-9a-fA-F]{40}$
  2. Typed data (required)
    • Type: object
    • Properties:
      • types
        • Type: object
        • Properties:
          • EIP712Domain
            • Type: array
      • primaryType
        • Type: string
      • domain
        • Type: object
      • message
        • Type: object

Returns

  • Signature
    • Type: string
    • Pattern: ^0x[0-9a-f]{130}$

Example

Request:

{
  "method": "eth_signTypedData_v4",
  "params": [
    "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826",
    {
      "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" }
        ],
        "Mail": [
          { "name": "from", "type": "Person" },
          { "name": "to", "type": "Person" },
          { "name": "contents", "type": "string" }
        ]
      },
      "primaryType": "Mail",
      "domain": {
        "name": "Ether Mail",
        "version": "1",
        "chainId": 1,
        "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "from": {
          "name": "Cow",
          "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
        },
        "to": {
          "name": "Bob",
          "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
        },
        "contents": "Hello, Bob!"
      }
    }
  ]
}

Result:

"0x4355c47d63924e8a72e509b65029052eb6c299d53a04e167c5775fd466751c9d07299936d304c153f6443dfa05f40ff007d72911b6f72307f996231605b915621c"

Deprecated methods

Please note that the eth_sign, eth_signTypedData_v1 and eth_signTypedData_v3 methods are deprecated but may still be used by some dapps.

Reference implementation

A reference implementation of the methods described here can be found in the eth-sig-util package.