alt Hacker NewsYou forgot one (the sane one, which is coming soon anyway):
Using a government issued eID system. The EU is going to rollout eID in a way that a site can just ask “is this person > age xy?”. The answer is cryptographically secure in the sense that this person really is this age, but no other information about you has to be known by the site owner.
Which is the actual correct way to do it.
I don’t understand why all the sites go crazy with flawed age verification schemes right now, instead of waiting a until the eID rollout is done.
EDIT: I forgot to mention that it’s only the correct way if the implementation doesn’t give away to your government on which sites you browse… Which I believe is correctly done in the upcoming EU eID but I could be wrong about it.
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Sites need to deal with Australia, which punted all responsibility to the platforms and provided no real assistance (like say the government half of the eID system that manages all the keys and metadata)
There are also alternatives that can be good enough, such as the Swedish BankId system, which is managed by a private company owned by many banks. They provide authentication and a chain of trust for the great majority of the population on about all websites (government, healthcare, banking and other commercial services) and is also used to validate online payments (3D Secure will launch the BankId app).
While it's not without faults (services do not always support alternative authentication which may support foreigners having the right to live in the country), it has been quite reliable for so many years.
So just to say, you can have successful alternatives to a government controlled system as many actors may decide it is quite valuable to develop and maintain such a system and that it aligns with their interest, and then have it become a de-facto standard.