The power of the USD and related sanctions isn't whether North Korea can move trivial sums of money in the process of modest criminal activities (trivial and mo

The power of the USD and related sanctions isn't whether North Korea can move trivial sums of money in the process of modest criminal activities (trivial and modest in the scale of national economies of consequence), it's whether you can heavily limit their ability to freely trade with the global economy. Bitcoin and Ethereum are not going to help North Korea very much in the scope of what they'd require. The US will (sooner or later) notice if X country in Asia suddenly starts doing $20 billion per year in crypto-based trade with North Korea, and that X country can be damaged economically as necessary to dissuade (make it not worth doing). That ability continues until you can convince most nations to abandon their currencies and turn all of that economic self-determination and political power over to independent crypto systems they have no control over. It ain't gonna happen.