Interest in cryptocurrencies has skyrocketed in recent years, most likely also due to the triumph of Bitcoin, which has rapidly increased in value in phases. In general, cryptocurrencies can be described as a type of virtual money. Unlike paper money, which is usually managed centrally, cryptocurrencies are purely digital. With the special feature of decentralized administration. Anyone who uses cryptocurrencies can see who has traded with whom and at what time via the blockchain.
You can find more general information on the topic in the blog article on the legal classification of Bitcoin.