You can't spend bitcoins at Amazon.com or to pay your mortgage but, as the Winklevoss twins showed on Wednesday, you can use the digital currency to book a trip into suborbital space.
Cameron and Tyler Winklevoss, who famously accused Facebook Inc founder Mark Zuckerberg of stealing their idea, said they used bitcoins to buy tickets for a high-altitude voyage on billionaire Richard Branson's Virgin Galactic commercial spaceflight venture.
The brothers, Olympic rowers who earned MBA degrees from Oxford University, have become bitcoin evangelists and investors and are planning to launch a fund to make it easy to trade the digital currency on the stock market.
(Read more: How to make money from bitcoin?)
In a blog post, Tyler Winklevoss compared Branson's space endeavor and bitcoin entrepreneurs to major historical figures who changed the way the world was perceived, like Marco Polo, Christopher Columbus, Vasco da Gama and Nicolaus Copernicus.
"It is in this vein that Cameron and I contemplate our tickets into space - as seed capital supporting a new technology that may forever change the way we travel, purchased with a new technology that may forever change the way we transact," he wrote.
(Read more: Back to work at bitcoin's embattled Mt.Gox)
Virgin Galactic, a U.S. offshoot of Branson's London-based Virgin Group, is selling rides on its SpaceShipTwo for $250,000.