The most functional system would be one that would support concluding anonymous, irreversible offline transactions without using special tamper-proof devices. However, the problem of banknote copying arises under these assumptions. This is because there is nothing to stop the client from duplicating the banknotes it holds and using them several times in various transactions. This necessitates storing some information about the holder in the banknote. However, we do not want this information to be readable when the user is behaving honestly. Lower down, we present a system based on this approach.