Cryptographically there are techniques that let you prove you're one of the several hundred million adults in the US that don't reveal anything about which adult you are. It's much less complicated than bitcoin.
I'm bringing this up because it's the perfect litmus test to show whether you really care about age verification, or if you want personal trackability for all internet behavior.
I'd be okay with this for certain situations (e.g. a forum that doesn't want to foreign agitators to pretend they are US voters), but the whole porn thing is a ridiculous farce because there are still going to always be millions of non-us porn sites that don't enforce US laws.
I'm bringing this up because it's the perfect litmus test to show whether you really care about age verification, or if you want personal trackability for all internet behavior.
I'd be okay with this for certain situations (e.g. a forum that doesn't want to foreign agitators to pretend they are US voters), but the whole porn thing is a ridiculous farce because there are still going to always be millions of non-us porn sites that don't enforce US laws.