There's an app for that! I Reveal My Attributes (IRMA) proves things like age without giving up SSN or whatever. I don't know the details but I've been hearing

There's an app for that! I Reveal My Attributes (IRMA) proves things like age without giving up SSN or whatever. I don't know the details but I've been hearing about it from nerds for years so I'm assuming there's a solid signature scheme behind it or some way to prove you're not carrying your of-age friend's phone. Doesn't seem like anyone's interested in rolling this out though... something something proof of vaccination in the EU without compromising privacy, perfect solution mumble mumble...