Thanks for this in detail post. This is a topic that is really relevant - and can become a big problem, if some countries decide to look for crypto earnings. As far as I know, it shouldn't be a problem, as long as the assets stay on the blockchain and do not get exchanged for fiat money. But that could be completely wrong in other countries. Or even in my own.
So far my earnings haven't been too big - so I am probably under our tax exempt amounts.
No financial or taxation advice though.