Signature Encoding

import { Wallet } from '@0xsequence/wallet'



// Construct your Sequence Wallet (out of scope for this section)

const wallet: Wallet



const message = "Hello, World!"



const prefixedMessage = "\x19Ethereum Signed Message:\n" + len(message) + message

const signature = await wallet.signMessage(prefixedMessage)

import { Wallet } from '@0xsequence/wallet'

import { encodeTypedDataDigest } from '@0xsequence/utils'



// Construct your Sequence Wallet (out of scope for this section)

const wallet: Wallet



// Encode the typed data

const chainId = 1

const typedData = {

	types: {

		Person: [

			{ name: 'name', type: 'string' },

			{ name: 'wallet', type: 'address' },

			{ name: 'count', type: 'uint8' }

		]

	},

	primaryType: 'Person' as const,

	domain: {

		name: 'Ether Mail',

		version: '1',

		chainId: chainId,

		verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC'

	},

	message: {

		name: 'Bob',

		wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',

		count: 4

	}

} 

const hashedData = encodeTypedDataDigest(typedData)



const signature = await wallet.signMessage(hashedData)

  /**

   * @notice Verifies whether the provided signature is valid with respect to the provided hash

   * @dev MUST return the correct magic value if the signature provided is valid for the provided hash

   *   > The bytes4 magic value to return when signature is valid is 0x1626ba7e : bytes4(keccak256("isValidSignature(bytes32,bytes)"))

   * @param _hash       keccak256 hash that was signed

   * @param _signatures Signature byte array associated with _data.

   *                    Encoded as abi.encode(Signature[], Configs)

   * @return magicValue Magic value 0x1626ba7e if the signature is valid and 0x0 otherwise

   */

  function isValidSignature(

    bytes32 _hash,

    bytes calldata _signatures

  ) public override virtual view returns (bytes4) {

    // Validate signatures

    (bool isValid,) = _signatureValidation(_hash, _signatures);

    if (isValid) {

      return SELECTOR_ERC1271_BYTES32_BYTES;

    }



    return bytes4(0);

  }