diff --git a/Substrate.NetApi/Model/Types/Account.cs b/Substrate.NetApi/Model/Types/Account.cs
index ce542fb..53cb0d6 100644
--- a/Substrate.NetApi/Model/Types/Account.cs
+++ b/Substrate.NetApi/Model/Types/Account.cs
@@ -140,14 +140,13 @@ public static Account Build(KeyType keyType, byte[] privateKey, byte[] publicKey
             return account;
         }
 
-
         /// <summary>
         /// Asynchronously signs the specified message.
         /// </summary>
         /// <param name="message"></param>
         /// <returns></returns>
         /// <exception cref="NotSupportedException"></exception>
-        public async Task<byte[]> SignRawAsync(byte[] message)
+        public virtual async Task<byte[]> SignRawAsync(byte[] message)
         {
             switch (KeyType)
             {
@@ -168,7 +167,7 @@ public async Task<byte[]> SignRawAsync(byte[] message)
         /// <param name="payload"></param>
         /// <returns></returns>
         /// <exception cref="NotImplementedException"></exception>
-        public async Task<byte[]> SignPayloadAsync(Payload payload)
+        public virtual async Task<byte[]> SignPayloadAsync(Payload payload)
         {
             return await SignRawAsync(payload.Encode());
         }