With bitcoin reaching $10,000 in the past few days it looks like we've got some of our first bitcoin billionaires. Brothers Winklevoss, Cameron and Tyler, are now likely to be bitcoin billionaires after they made an $11 million bet on the cryptocurrency several years ago. While it's not clear how many bitcoins the brothers have altogether, estimates put the stash at around 100,000 BTC, which is worth more than a billion dollars worth. The pair, famous for their spat with Mark Zuckerberg as popularised in the film, The Social Network, launched their own bitcoin online exchange and venture capital fund. Two years ago, Cameron Winklevoss went on the record saying "We've never sold a bitcoin, we're in it for the long haul." If they kept true to that then they should be fairly pleased with themselves right now.