Cryptos are not currencies. They are more like postage stamps that collectors may impute a value to, BUT, no government guarantees them, and they have no intrinsic value. Nor are they in limited supply. There may be a multitude of issues and/or issuers, although, like stamps, each issue is limited, it all depends on having a large group of keen collectors.
Scary stuff. Good luck with your collectibles.
Some commentators (deliberately?) confuse things by talking about blockchain, the excellent recording of your collectible.
