With the emergence of electronic id cards in several countries (e.g. Estonia, Germany), there is the real possibility of equally distributing currency to card h

With the emergence of electronic id cards in several countries (e.g. Estonia, Germany), there is the real possibility of equally distributing currency to card holders, even depending on properties such as current residence or birth date (dystopian version: names or only people with specific biometrics: eye color, heights or specific facial features). It is possible to create a signature scheme that guarantees privacy while avoiding double spending. One limitation to this is that organisations wanting to use signatures (at least in my country) must register with the government as a service provider, which might be a point of failure.