Bulgaria has a double tax treaty with the UAE. In the UAE there is no income tax, VAT registration threshold is 375,000AED which is just below 89,000 €. He rents a storage facility located in the UAE which he sublets on paper. He uses a made up sublease contract with an offshore company that says the company rents the storage facility from him as a virtual address. Income from renting out a permanent establishment in the UAE is taxable in the UAE (at 0%) according to all OECD double tax treaties. This way he can cash out 89000€ worth of crypto a year (he does the same for his wife and his dad so 3×€89k/year actually) proving with the sublease contract to his local tax man that he earns this amount completely legally with a 0% tax.
I have actually spent the last two weeks looking into the above UAE solution discussed by 'totlori9' and 'Jessie' in this thread. I have contacted a local tax advisor last week and she confirmed this would work as described. I have also since found a company in the UAE offering storage rooms for expats that have their own postal addresses (think of it like a PO box but instead of the size of a drawer it is the size of a room) and they allow you to rent out the rooms further to someone for profit. Just wanted to say thanks for this idea, and let everyone here know that this was actually confimred to be a viable solution to the' cashing out crypto in your name' problem if your country of residence has a double taxation treaty with the UAE and that I have decided to pull the trigger on this one thanks to this thread.