"I see the promise of these new technologies, but I also see the reality: cryptocurrencies have been used to launder the profits of online drug traffickers; they’ve been a tool to finance terrorism," Yellen said.
A CNBC contributor said the U.S. government wouldn't stomach losing the dollar's supremacy to bitcoin. Others say "the ship has sailed" on an outright ban.
With the top two cryptos down on the day and a bitcoin supply squeeze seemingly in the cards, CoinDesk’s Market Daily is back with the latest news roundup.