signMessage #

Calculates an Ethereum-specific signature in EIP-191 format: keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)).

With the calculated signature, you can:

• use verifyMessage to verify the signature,
• use recoverMessageAddress to recover the signing address from a signature.

Usage #

import { getAccount } from 'viem'
import { walletClient } from './client'
 
const account = getAccount('0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266')
 
const signature = await walletClient.signMessage({ 
  account,
  message: 'hello world',
})
// "0xa461f509887bd19e312c0c58467ce8ff8e300d3c1a90b608a760c5b80318eaf15fe57c96f9175d6cd4daad4663763baa7e78836e067d0163e9a2ccf2ff753f5b1b"

import { createWalletClient, custom } from 'viem'

export const walletClient = createWalletClient({
  transport: custom(window.ethereum)
})

Returns #

Hex

The signed message.

Parameters #

account #

• Type: Address

Account to use for signing. Read more.

const signature = await walletClient.signMessage({
  account: getAccount('0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'), 
  message: 'hello world',
})

data #

• Type: string

Message to sign.

const signature = await walletClient.signMessage({
  account: getAccount('0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'),
  message: 'hello world', 
})

JSON-RPC Methods #

• JSON-RPC Accounts:
  • personal_sign
• Local Accounts
  • Signs locally. No JSON-RPC request.