“It’s a pretty big blow,” said Russ Dallen, the managing director at Caracas Capital. “Since most cryptocurrencies are not actually backed by anything real, cryptocurrency speculation is based on the greater fool theory — I can buy this at $100 because there is someone who is a bigger idiot who is going to buy it at $200. When you take the U.S. out of that equation, you reduce the interest and potential for that speculation.”

https://www.bloomberg.com/news/articles/2018-03-19/trump-prohibits-u-s-purchases-of-venezuelan-cryptocurrency

https://www.express.co.uk/finance/city/934495/petro-banned-united-states-cryptocurrency-news-donald-trump-venezuela