The Winklewii's bitcoin ETF SEC filing includes all the dangers of owning bitcoins. The good people of r/buttcoin on Reddit summarized it for you: http://www.reddit.com/r/Buttcoin/comments/2rv44y/the_winklevoss_sec_filing_is_an_absolute_comedy/
Well, it is only down 25% in the first 2 weeks of the new year. I guess low price is the biggest danger of bitcoin. Oh yes, since it is January we also had the annual exchange hack when 5 million bucks worth BTCs got stolen and with this price dropping the thiefs' best interest is to cash out as soon as they can....
SEC Edgar for Winklevoss Bitcoin Trust http://www.sec.gov/cgi-bin/browse-e...01579346&owner=exclude&count=40&hidefilings=0 Amended S1 from 30 December 2014 http://www.sec.gov/Archives/edgar/data/1579346/000119312514457552/d721187ds1a.htm .