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Documentation Index

Fetch the complete documentation index at: https://seilabs-docs-evm-reference-and-sei-js-examples.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

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Signing

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

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Wallet Signing Support

MethodStandardSei Global WalletMetaMaskWalletConnect wallets
personal_signEIP-191SupportedSupportedWallet-dependent
eth_signTypedData_v4EIP-712SupportedSupportedWallet-dependent
eth_signLegacyNot recommendedSupportedWallet-dependent
Transaction signing—SupportedSupportedSupported
Do not assume all wallets support all methods. Always handle rejection gracefully.

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Personal Sign

import { createWalletClient, custom } from 'viem';
import { sei } from '@sei-js/precompiles/viem';

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

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

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

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EIP-712 Typed Data

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),
  },
});

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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,
});

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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