@petrisch this is interesting, but if I understood correctly, GNU Taler is not a currency by itself, it is more like a payment system that can be used in different ways together with different currencies, I think.
Can you point to a specific payment system using GNU Taler that would be used for the payment?
(I think it would be possible for a central bank to use GNU Taler as a way of handling digital currency, but as far as I know, no central bank has decided to do that, not yet anyway.)