Back in September 2017 Dimon angered the cryptocurrency world by calling bitcoin a "fraud" and said "if you're stupid enough to buy it, you'll pay the price for it one day,"

Regarding those comments now - he says "I regret making them" in an interview on Fox Business.

But Dimon wasn't all cheer about Bitcoin, and also added he worries about how "governments are going to feel about bitcoin when it gets really big." To be fair, a concern shared even by Bitcoin lovers.

Dimon's earlier comments had seemed to be at odds with his own company for months.  In October JP Morgan Chase announced they would be using blockchain technology to speed up their global payments in a project called "Interbank Information Network" and said the tech would increase the speed of these transactions "from weeks to hours."

It seems Dimon is becoming a believer, slowly.

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Speaking to Fox News regarding the new Bitcoin futures market now giving disbelievers the ability to bet against Bitcoin, Cameron Winklevoss said:

"We’ve been working really hard to give Jamie Dimon an opportunity to short bitcoin... anybody who says that you know, it’s a fraud or a bubble, you can go now put your money where your mouth is, and bet against it”.

Jamie Dimon is JP Morgan Chase's CEO, and famously said back in October:

"If you’re stupid enough to buy it, you’ll pay the price for it one day".

Recently the Wall Street Journal reported on rumors that JP Morgan is looking into giving their clients access to Bitcoin futures through CME Group.

No word on if Dimon will "put his money where his mouth is".

The Winklevoss twins are the founders of the Gemini exchange, but better known as the twins who sued Mark Zuckerberg claiming they were the actual creators of facebook, as seen in the movie "The Social Network".