GNU Taler solves some of these problems - https://taler.net https://taler.net > Private > When you pay with Taler, your identity does not have to be revealed.

GNU Taler solves some of these problems - https://taler.net https://taler.net > Private > When you pay with Taler, your identity does not have to be revealed. Just like payments in cash, nobody else can track how you spent your electronic money. However, you obtain a legally valid proof of payment.