chainsafe-test/Assets/Web3Unity/Scripts/Prefabs/Wallet/Web3WalletSignVerify.cs

using System.Text;
using Nethereum.Signer;
using Nethereum.Util;
using UnityEngine;
using Web3Unity.Scripts.Library.Web3Wallet;

public class Web3WalletSignVerify : MonoBehaviour
{
    // Start is called before the first frame update
    async void Start()
    {
        string message = "hello";
        string signature = await Web3Wallet.Sign(message);
        //verification
        SignVerifySignature(signature, message);
    }

    public void SignVerifySignature(string signatureString, string originalMessage)
    {
        string msg = "\x19" + "Ethereum Signed Message:\n" + originalMessage.Length + originalMessage;
        byte[] msgHash = new Sha3Keccack().CalculateHash(Encoding.UTF8.GetBytes(msg));
        EthECDSASignature signature = MessageSigner.ExtractEcdsaSignature(signatureString);
        EthECKey key = EthECKey.RecoverFromSignature(signature, msgHash);

        bool isValid = key.Verify(msgHash, signature);
        Debug.Log("Address Returned: " + key.GetPublicAddress());
        Debug.Log("Is Valid: " + isValid);
    }
}