Signing

Wallet signing method support and EIP-712 typed data on Sei

Signing

Signing on Sei works through standard EVM libraries and wallet standards. The methods available depend on which wallet the user has connected.

Wallet Signing Support

Method	Standard	Sei Global Wallet	MetaMask	WalletConnect wallets
personal_sign	EIP-191	Supported	Supported	Wallet-dependent
eth_signTypedData_v4	EIP-712	Supported	Supported	Wallet-dependent
eth_sign	Legacy	Not recommended	Supported	Wallet-dependent
Transaction signing	—	Supported	Supported	Supported

Do not assume all wallets support all methods. Always handle rejection gracefully.

Personal Sign

viem

import { createWalletClient, custom } from 'viem';
import { sei } from 'viem/chains';

const client = createWalletClient({
  chain: sei,
  transport: custom(window.ethereum),
});

const [account] = await client.getAddresses();

const signature = await client.signMessage({
  account,
  message: 'Hello Sei',
});

EIP-712 Typed Data

viem

const [account] = await client.getAddresses();

const signature = await client.signTypedData({
  account,
  domain: {
    name: 'My App',
    version: '1',
    chainId: 1329, // Sei mainnet
    verifyingContract: '0xContractAddress',
  },
  types: {
    Order: [
      { name: 'maker', type: 'address' },
      { name: 'amount', type: 'uint256' },
      { name: 'expiry', type: 'uint256' },
    ],
  },
  primaryType: 'Order',
  message: {
    maker: account,
    amount: 1000000n,
    expiry: BigInt(Math.floor(Date.now() / 1000) + 3600),
  },
});

Verifying Signatures

viem

import { verifyMessage, verifyTypedData } from 'viem';

// Verify personal sign
const valid = await verifyMessage({
  address: '0xSignerAddress',
  message: 'Hello Sei',
  signature,
});

// Verify EIP-712
const validTyped = await verifyTypedData({
  address: '0xSignerAddress',
  domain,
  types,
  primaryType: 'Order',
  message: value,
  signature,
});

EIP-1271 Contract Signatures

Smart contract wallets on Sei can validate signatures via EIP-1271 (isValidSignature). Use viem’s verifyMessage with a contract address — it automatically uses EIP-1271 when the address is a contract.

viem

const valid = await verifyMessage({
  address: '0xSmartContractWallet',
  message: 'Hello Sei',
  signature,
});
// viem calls isValidSignature if the address is a contract