What’s the best tax-efficient setup for my situation and how to
make sure the accounting is done properly?
Yes, @HeRetiK gives you advice.
The rules have been implemented on crypto tax including Denmark, the United States, Central/South America, Britain and so on, almost the average state has legal system and respective rules for crypto.
In short:
The IRS treats cryptocurrency as property, meaning that when you buy, sell or exchange it, this counts as a taxable event and typically results in either a capital gain or loss. When you earn income from cryptocurrency activities, this is taxed as ordinary income.
So, you are safer and more information you get about taxes go to tax authorities where you are, it's better.