http://www.washingtonpost.com/blogs/the-switch/wp/2018/06/20/why-bitcoin-exchanges-keep-getting-hacked-and-how-to-protect-yourself/ > The price of bitcoin took a tumble early Wednesday after a major South Korea-based cryptocurrency exchange, Bithumb, admitted hackers made off with more than $31 million worth of virtual currency. The incident is the latest in a long string of thefts at the online portals where investors trade cash for digital coins such as bitcoin and ether. Bithumb has not said how the attack occurred. > What makes exchanges vulnerable to these sorts of attacks in the first place?