States just need to spend resources enough to orphan blocks created by other miners until the other miners give up. Then the resourceful attacker can pause mining new blocks too, until the next attempt.

This actually has me concerned. If countries nationalize mining in one big swoop it could kill PoW. Unless full legalization succeeds in enough countries so they don't try to fight it. Joe makes a solid argument.

Time to damp it frens. (I'll stack some more just in case).