Before revision:  As quantum technology develops, in parallel to crypto-currencies entering market, various other schemes for quantum currencies are being proposednowadays. The schemes put forward so far relay on assumption that the mint does not cooperate with the counterfeiter who may use malicious terminal for verification.
After revision:  As quantum technology develops, in parallel to crypto-currencies entering market, various other schemes for quantum currencies have been proposed, all however relying on the assumption that the mint does not cooperate with the counterfeiter who may use malicious terminal for verification.