this post was submitted on 12 Dec 2025
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Every time I've looked at the details of elaborate schemes resembling the one you imagine, I'm always left with a lot of doubts that they're secure or practical. Every time I've looked at the systems that have actually been implemented in reality, I have no doubt that they suck.
That's valid. My preference is for device-side child locks. For instance, a header that says, "I am a child." There is much to improve there still. But failing that, if the winds of politics dictate we must have verification -- why not ZKP?
I don't feel it's elaborate at all. I like these solutions because they are actually quite simple. It's just signing and verifying requests using asymmetric key cryptography, techniques which are known to be robust and secure. The government never knows which web services you are verifying for, and the web services never know your identity or any more information than they need to. They don't even learn your precise age, just that you're over 16/18/21 whatever.
You are suggesting that a system which does not yet exist will be perfectly safe and secure. None of the ones for which I have seen actual design documents are anything like as safe as you imagine.