Hi guys

I have a legal question.
Suppose a standard hypothetical scenario where NEM rises to 1USD in 1-2 years. I will want to withdraw some of my funds lets say 1 mil USD.
Now 1 mil USD will just arrive to my bank account - I would expect the financial police will be suspicious of how I could gain so much money.

Is someone here able to explain how this works in European legislation? Can I just withdraw money and say that I was a lucky NEM holder and everything will be fine?
Will I need to declare this as an asset gain and pay taxes? Or is this tax-free?

Thanks for your input!