Some kind of anonymous token that says “I’m adult” and smart card on credit cards are kind of that, but they have a unique identifier that identifies you. They’re not anonymous which is the only acceptable kind of adult verification. It makes more sense to cordon off all parts of the internet with identity/age verification and consider them destroyed. I’d like to have an IP banlist of all participants in his harebrained scheme, just rip off the bandair immediately rather than have them shit the bed down the line.