Yes, I have been realizing some of those things. That’s why I haven’t said anything else about it.
However, I do not understand why DC sends matters and signatures to the messages, knowing that the other user has DC and that data is not shown in the message and is (I think, unnecessary), that information should be sent only when communicating with a MUA.
Anyway I will close it (when I know how to do it) and worry about things that I can understand.