@{

    // Transaction hash

    string TxHash = "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef";

    // Address derived from private key

    string FromAddress = "0x12890D2cce102216644c59daE5baed380d84830c";

    // Valid signature generated for the message and address

    string TxSignature = "0x5e8b8e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a3e4d6e8c57c4f78a1b";

    string res = "";

​

    // Check if inputs are empty or null

    if (string.IsNullOrWhiteSpace(TxHash) || string.IsNullOrWhiteSpace(FromAddress) || string.IsNullOrWhiteSpace(TxSignature))

    {

        res = "Please provide all required transaction details.";

    }

    // Validate transaction hash format

    else if (!TxHash.StartsWith("0x") || TxHash.Length != 66)

    {

        res = "Invalid transaction hash format. Expected 66 characters with '0x'.";

    }

    // Validate address format

    else if (!FromAddress.StartsWith("0x") || FromAddress.Length != 42)

    {

        res = "Invalid address format. Expected 42 characters with '0x'.";

    }

    // Validate signature format

    else if (!TxSignature.StartsWith("0x") || TxSignature.Length != 132)

    {

        res = "Invalid signature format. Expected 132 characters with '0x'.";

    }

    else

    {

        try

        {

            // Reconstruct the message as in personal_sign

            var message = "Verify TX: " + TxHash;

            var prefixedMessage = "\x19Ethereum Signed Message:\n" + message.Length + message;

            var messageBytes = System.Text.Encoding.UTF8.GetBytes(prefixedMessage);

​

            // Verify the signature

            var signer = new Nethereum.Signer.EthereumMessageSigner();

            var recoveredAddress = signer.EcRecover(messageBytes, TxSignature);

​

            // Check if recovered address matches

            res = string.Equals(recoveredAddress, FromAddress, StringComparison.OrdinalIgnoreCase)

                ? "Transaction verified"

                : "Invalid signature";

        }

        catch (Exception ex)

        {

            // Only catch system-level errors

            res = "Verification failed due to system error: " + ex.Message;

        }

    }

}

@res