diff --git a/src/Managing.Application/Users/UserService.cs b/src/Managing.Application/Users/UserService.cs
index c11d719..84f2e4d 100644
--- a/src/Managing.Application/Users/UserService.cs
+++ b/src/Managing.Application/Users/UserService.cs
@@ -11,6 +11,8 @@ public class UserService : IUserService
     private readonly IUserRepository _userRepository;
     private readonly IAccountService _accountService;
 
+    private string[] authorizedAddresses = new string[] { "0x6781920674dA695aa5120d95D80c4B1788046806" };
+
     public UserService(
         IEvmManager evmManager,
         IUserRepository userRepository,
@@ -25,6 +27,9 @@ public class UserService : IUserService
     {
         var recoveredAddress = _evmManager.VerifySignature(signature, message);
 
+        if (!authorizedAddresses.Contains(recoveredAddress))
+            throw new Exception("Address not authorized");
+            
         if (recoveredAddress == null || !recoveredAddress.Equals(address))
             throw new Exception("Address not corresponding");