This is the 1365th most frequent German word.
bitcoin
Bitcoin: A decentralized digital currency using blockchain technology.
In this sentence, 'Bitcoin' is used as a singular noun referring to the cryptocurrency unit.
Ich habe gestern meinen ersten Bitcoin gekauft.
I bought my first Bitcoin yesterday.
Here, 'Bitcoins' is used in plural form to indicate multiple units of the cryptocurrency.
Bitcoins können sicher auf einer digitalen Wallet gespeichert werden.
Bitcoins can be securely stored in a digital wallet.
In this instance, 'Bitcoin' represents the general idea or system behind the cryptocurrency.