The only requirement I dropped is absolute perfect security, which no system will have and certainly not the nonsense "show your ID to the camera" stuff they're actually using.

I showed how to eliminate proxies, and without that, the only hole is the credentials themselves getting passed around. If that happens at a small scale between people who know each other, it's a minor problem. If a credential gets posted online and widely shared, it's easy to notice and revoke it.

No you go in a circle. My claim is: the system can be secure XOR the system can be anonymous.

And you go in circles. One post, you drop anonymity, I point out that leads to security problem, next post you drop security and ... you get back anonymity, I point that out and, guess where we go from there? I mean your list of replies is becoming an ever stronger argument for what you're denying.

At this point I can only ask that you actually read my above comments more closely and think about them. I have exactly the level of security I described in my last comment, with complete anonymity, all with one design. If your claim is that this level of security is insufficient, my answer is that it's more secure than anything actually being used for age verification, by a significant margin.

The reason we keep switching back and forth is that every time you make objection A, and I explain how the system addresses that, you switch to objection B, ignoring that I already explained how the system addresses that as well.