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There’s something ominous about the speed with which the entire world has marched to require identification on platforms and, as I expected, begin the process of banning anonymous VPNs.

Do you know who/what is leading in terms of cryptographic, privacy enhancing identification technologies?

Unclear on what you’re asking here. “Privacy enhancing identification” seems like an oxymoron. Identification, in the sense of tying activity to a real world identity, is inherently an information-disclosing / privacy-reducing activity.

Bad terminology, maybe, but I mean something like: can you verify age to access social media without uploading a photo of your passport?

At some point, you have to show an official document to someone, or else undergo some sketchy estimation algorithms. Crypto only helps convey the results. @rtfm.com and KGI put out a pretty thorough report on this. kgi.georgetown.edu/research-and...