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@anarchopunk_girl @kkarhan @Mer__edith @signalapp

This is perfectly wrong, especially the "who sends each message". The only metadata you can get from a phone number is, does it have a Signal account, when was this account created, and when was the last time this account logged in. That's it. Nothing else.

Signal is state of the art. 10 times more secure than anything else, including XMPP + OMEMO mentioned below. The only problem it has is, it's centralized.