Many might’ve seen the Australian ban of social media for <16 y.o with no idea of how to implement it. There have been mentions of “double blind age verification”, but I can’t find any information on it.
Out of curiosity, how would you implement this with privacy in mind if you really had to?
Not a cryptographic expert by any means but maybe something like this would work. This’d be implemented in common places people shop: supermarkets for instance. You’d go up to customer service and show your ID for visual confirmation only; no records can be created. In return the service rep would give you a list of randomised GUIDs against which the only permissible record can be “has been taken”. Each time you need to prove your age you’d feed in one of those GUIDs.