The rise of bitcoin, an electronic currency traded on an online exchange, has generated a media frenzy. Once scoffed at, its value has risen by 631% (denominated in dollars) since the start of 2013.
Lots of people think that means were in a bitcoin bubble and it will eventually pop. But if youre one of these bitcoin bears, its not easy for you to short iti.e., bet that its value will go down.
http://qz.com/69630/how-to-short-bitcoins-if-you-really-must/