[Epa095]

So let's make it illegal to keep the tokens more than e.g 6 months.

We should not underestimate the power of the legal system to enforce freedom and anonymity. And on the flip side, it's hard to create a technical system which can actually withstand the force of the government if it chooses to come after you.

I believe the correct battlefield for freedom is the political one, in the end it decides everything. And neither guns nor technical tricks can secure freedom against a tyrannical state.

Wuth that said, it does tickle the curiosity to think about! A technical-political solution could be to introduce a new actor, the broker. It sits between the webpage and the age-verifier, receiving the age-verification, but then giving it's own proofs to the webpage (so acting as a trusted middleman). Now to match up visitors with identities you need to get the data from both the webpage, the broker and the age-verifier.

You could imagine that the broker were in a different jurisdiction, maybe even one without a close cooperation with the government. Maybe people could even choose their own brokers (among certified ones).

[uniq7]

So let's trust all future Governments to never remove the 6-month law?

Once the whole technical system is implemented, it will be trivial to remove that bureaucratic limitation, and somehow it will be sold as better protection for the children.

[raxxorraxor]

The legal system wasn't at all required to "enforce" freedom and anonymity, on the contrary. Social media did want to end it and so do some states now.