It’s not my invention. It’s in the article. The physical card proposed contains nothing traceable. “They issue a card that says only one thing: "over 18". The card carries official seals, signatures, and anti-forgery features.”
If you put an id on the card, then it’s a layer of indirection, but you’ve still handed them a unique personal identifier.
Traceable credentials are fundamentally not privacy preserving, because that’s what traceable means.
If you put an id on the card, then it’s a layer of indirection, but you’ve still handed them a unique personal identifier.
Traceable credentials are fundamentally not privacy preserving, because that’s what traceable means.