Jamie Dimon talks about bitcoin one day after saying 'I'm not going to talk about bitcoin anymore'

Jamie Dimon can't get bitcoin off his mind.

JPMorgan's CEO popped off about bitcoin one day after saying he was done talking about the red-hot digital currency, which Friday morning reached more than $5,800 per coin.

The billionaire banker, who in mid-September called bitcoin "a fraud" said on Friday "who cares about bitcoin" while speaking at a conference in Washington DC, according to Bloomberg.

He also said that governments would impede bitcoin's growth.

During JPMorgan's earning call on Thursday, Dimon said he wouldn't put bitcoin into "the category of important things in the world" and that he wasn't "going to talk about bitcoin anymore."

Dimon, according to Bloomberg, said that his remark's Friday would be the last time he would talk about the coin.

The massive growth of the market has piqued the interest of folks from Main Street to Wall Street, but Wall Street's top execs - who have seen their fair share of bubbles - have voiced their concern about the cryptocurrency.

Ray Dalio, the founder of the world's largest hedge fund, echoed Dimon's criticisms of bitcoin on September 19.

The billionaire founder of Bridgewater Associates said bitcoin "is a bubble" during an appearance on CNBC's Squawk Box.

And in a recent interview with Bloomberg News last week, Larry Fink, the head of the BlackRock, the world's largest investor, said he thinks the explosive growth of bitcoin points to nefarious behavior.

"It just identifies how much money laundering there is being done in the world," Fink said. "How much people are trying to move currencies from one place to another."

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