This. What's the point of having millions if you can't enjoy it? The point of having a lot of money is having a great quality of life. You can't buy a nice house if you can't explain where the money came from.

Taxes cannot be avoided unless you want to have millions worth of bitcoin which you can only spend on irrelevant things, and I don't see the point.

This is why you must keep track of everything and save as much information as possible about how you got your bitcoins.