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Produces an ERC-1271-compatible signature over a plain message.

​
Request

import { stringToHex } from 'viem'

const signature = await provider.request<`0x${string}`>({
  method: 'personal_sign',
  params: [stringToHex('I acknowledge the terms.'), address],
})

​
Parameters

​
params[0]
`0x${string}`
required
Hex-encoded message bytes.
​
params[1]
`0x${string}`
required
Smart-account address. Must match the connected account.

​
Returns

0x${string}, the signature, packed for ERC-1271 verification.

​
Errors

CodeCause
4001User rejected the signature
4100Wallet not connected

​
Verification

import { publicClient } from './viem'

const isValid = await publicClient.verifyMessage({
  address,
  message: 'I acknowledge the terms.',
  signature,
})
viem handles ERC-1271 (and ERC-6492 for undeployed accounts) automatically.