The author asked for guidance:
>I called the VID (Latvian State Revenue Service) and asked in detail what I should do. I was told that I should first register as a self-employed person with the profession of an artist. And I have to convert my income into fiat and pay tax on the income in fiat because cryptocurrency is not money in Latvia.
...followed it by converting to Euros and paying taxes and then still had his bank account frozen for half a year without any further clarification on what he did wrong or how to fix it.