Doubled in over a month. Insane. Bitcoin is an alternate global currency. Not sure how they evaluate the "value" of a coin, but seems like its value is based on stock-market like speculation (probably most similar to gold/precious metals). Right now it's value is being run up by pure speculation, like the real-estate flipping boom of 2005-2007 on steroids. Bitcoin uses blockchain to determine ownership, which is actually the interesting part of it. Blockchain is like a transparent, permanent ledger that cannot be changed. When all parties sign off on a transaction it gets entered into the "blockchain" and no one can delete it. Blockchain has the ability to drastically cut transaction costs/time. Think of buying a house - all of the money you spend on title insurance is for manual research of title history to make sure that nobody has a lien/claim on the title. If there were an open, transparent, permanent ledger that shows all historical transactions involving the title... no, or at least very minimal, title insurance costs and shorter closing time.