In the future, Callisto Company miners operate "pure minting" operations on many moons and bases. They are able to mine actual, physical cryptocurrency in a process called crypto molding. The end result is a beautiful plate of a given crypto, much like the gold and silver bars of yesteryear.
Cardano has maintained strength over the centuries, being popular on Earth and many other planets. It has survived the test of time, though in the 4th millennium, lost it's spot in the galactic power ratings top ten. Still, it is as sturdy as they come, all things considered, over the centuries.