[xtf]

And that is what xmpp already offers

[3131s]

It seems to be a favorite of criminals everywhere, which is a good measure of worth in this case.

https://www.cyberscoop.com/jabber-xmpp-cybercrime-russia-enc...

There was a major deep web counterfeiter about a decade ago that remained active on Jabber even as a federal fugitive, not sure what ended up happening to him.