public override string ToString()
 {
     return("Sender: '" + SenderHash.ToString() +
            "', Receiver: '" + ReceiverHash.ToString() +
            "', Payload length: " + Payload.Length.ToString() +
            "', Hash: '" + ComputedHash?.ToString());
 }
 public override string ToString()
 {
     return("Sender: '" + SenderHash.ToString() +
            "', Receiver: '" + ReceiverHash.ToString() +
            "', Payload length: " + Payload.Length.ToString() +
            "', Hash: '" + GetHash(Provider).ToString());
 }