changes

Assets/Web3Unity/Scripts/Scenes/WalletLogin.cs

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+using System.Text;
+using Nethereum.Signer;
+using Nethereum.Util;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using UnityEngine.UI;
+using Web3Unity.Scripts.Library.Web3Wallet;
+
+public class WalletLogin : MonoBehaviour
+{
+    public Toggle rememberMe;
+    private void Start()
+    {
+        // if remember me is checked, set the account to the saved account
+        if (PlayerPrefs.HasKey("RememberMe") && PlayerPrefs.HasKey("Account"))
+            if (PlayerPrefs.GetInt("RememberMe") == 1 && PlayerPrefs.GetString("Account") != "")
+                // move to next scene
+                SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
+    }
+    public async void OnLogin()
+    {
+        // get current timestamp
+        var timestamp = (int)System.DateTime.UtcNow.Subtract(new System.DateTime(1970, 1, 1)).TotalSeconds;
+        // set expiration time
+        var expirationTime = timestamp + 60;
+        // set message
+        var message = expirationTime.ToString();
+        // sign message
+        var signature = await Web3Wallet.Sign(message);
+        // verify account
+        var account = SignVerifySignature(signature, message);
+        var now = (int)System.DateTime.UtcNow.Subtract(new System.DateTime(1970, 1, 1)).TotalSeconds;
+        // validate
+        if (account.Length == 42 && expirationTime >= now)
+        {
+            // save account
+            PlayerPrefs.SetString("Account", account);
+            if (rememberMe.isOn)
+                PlayerPrefs.SetInt("RememberMe", 1);
+            else
+                PlayerPrefs.SetInt("RememberMe", 0);
+            print("Account: " + account);
+            // load next scene
+            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
+        }
+    }
+    public string SignVerifySignature(string signatureString, string originalMessage)
+    {
+        var msg = "\x19" + "Ethereum Signed Message:\n" + originalMessage.Length + originalMessage;
+        var msgHash = new Sha3Keccack().CalculateHash(Encoding.UTF8.GetBytes(msg));
+        var signature = MessageSigner.ExtractEcdsaSignature(signatureString);
+        var key = EthECKey.RecoverFromSignature(signature, msgHash);
+        return key.GetPublicAddress();
+    }
+}