key, rotated. The receiving and Keychat address, are address messages in encryption sending constantly

What does it mean in practice? No one can track anything, or some observes can?

The ID is derived from a seed phrase and controlled by the user. Users can choose which relay to use. Mini Apps are provided by different developers, not by a single big company.

Yeah, this mechanism protects the metadata privacy of messages, meaning the metadata on the envelope won't be exposed. (Sorry, the previous reply was incorrect—I misread the note.)