Copper coins are an unreleased feature of Belletristica and they are supposed to become our official currency for everything gameplay-related. There is no release date yet, but their introduction is planned for the near future.
Just like gemstones, copper coins will be stored in your treasury and shared with your pseudonyms. It is planned, that copper coins can be gifted to other users and that they should act as the basis for trading ingame-ressources.
Copper coins will not be available for purchase with real-life money.