And what's more, although some of those things sounded a bit counter-intuitive, like proving I'm over 18 without proving who I am, the cryptography to do that not only exists, it's extremely well-known and well-understood.
更重要的是， 虽然有些事情有些匪夷所思， 比如证明我年满 18 但不泄露我是谁， 事实上相关加密技术不仅存在， 而且非常普遍易懂。