I think the "how" part is the most interesting question here, both in terms of political justification (people who bought $100 of BTC on their coinbase app won'

I think the "how" part is the most interesting question here, both in terms of political justification (people who bought $100 of BTC on their coinbase app won't be very pleased) and practical enforcement. Of authors suggested measures, I think only the first would be necessary to result in a de-facto ban. "Halt all wire transfers of dollars in and out of cryptocurrency exchanges. Halt foreign entities trading in dollar cash-equivalent crypto assets. Add Chinese and other foreign cryptocurrency exchanges hiding in tax-havens to sanctioned entities lists. Regulate the sale of any existing cryptocurrency assets to US persons by classifying them as securities investment contracts moving forward."