Cameron and Tyler Winklevoss are most famous for their courtroom clash with Facebook and its founder Mark Zuckerberg. That lawsuit ultimately earned the twins $20 million, as well as Facebook stock that was worth $45 million at the time (but now may be worth $200 million). Their high-stakes tech litigation was immortalized in the movie The Social Network, in which the Zuckerberg character refers to the twins as the "Winklevii."

Today, the Winklevoss twins disclosed what they're doing with part of their fortunes—investing in Bitcoin. In fact, they just disclosed to The New York Times that they own about $11 million worth of Bitcoin. That puts their holdings at about one percent of the world supply, since there is an estimated $1.3 billion worth of Bitcoin currently in circulation. The codes for the Winklevoss' Bitcoins are stored on flash drives, which they keep in safe deposit boxes in three different cities.

“We have elected to put our money and faith in a mathematical framework that is free of politics and human error,” Tyler Winklevoss said.

It's not their only project. Through their company Winklevoss Capital, they've also invested in a shopping site called Hukkster and SumZero, "an online community for professional money managers."

The virtual currency has been incredibly volatile lately, but it's clear anyone who bought in early, like the Winklevosses did, has made a pretty penny at this point. In February it hit an all-time high of $33; by last week it had tripled in value from that to more $100. Then it soared to $260 before crashing down, losing more than half its value in six hours.

The Winklevosses expressed confidence that their bet is a good one. They bought in when Bitcoins cost less than $10 each, so it's probably one of their most high-margin investments. They believe there are at least a few other "early adopters" who have holdings as large as theirs, but it's hard to know for sure.

“People really don’t want to take it seriously," said Cameron Winklevoss. "At some point that narrative will shift to ‘virtual currencies are here to stay.’ We’re in the early days.”

The Winklevosses were involved in years of appeals after their Facebook settlement, saying they were cheated and didn't get enough money. They accused their lawyers of malpractice, then hired new lawyers to spark a long array of appeals, all of which failed. They finally gave up their legal fight in 2011.