I wonder whether the same prosecutors and tax officials from the BEB will declare their crypto.

Cryptocurrency in Ukraine is like riding an electric scooter in 2015: you don’t seem to be breaking the law, but everyone looks at you with suspicion. So can you be held accountable for using cryptocurrency? Let’s break it down.
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What does the law say?
In 2023, Ukraine adopted the Law "On Virtual Assets." It defines cryptocurrency as not money, but a virtual asset. That is, you formally cannot pay for coffee with bitcoins, but owning them is completely legal.