Infamous short-seller Andrew Left scrambling for ways to bet against bitcoin
Opportunities to short, or bet against, bitcoin are "limited," "but they're nice and juicy, and Riot's one of them right now," Citron Research founder Left says on CNBC's "Fast Money."
Riot Blockchain turned down a CNBC request to appear on "Fast Money." "No one at the company has been able to get in touch with the CEO," a Riot spokesperson said.
A major problem is being unable to borrow shares in order to sell them short, he said. If people could "get borrows" on the Bitcoin Investment Trust, Left says, it would fall 1,000 percent.