http://www.washingtonpost.com/blogs/the-switch/wp/2018/06/19/major-cryptocurrency-exchange-bithumb-halts-trading-after-more-than-31-million-hack/ > SEOUL – One of the largest cryptocurrency exchanges suspended operations Wednesday after announcing that hackers stole more than $31 million worth of virtual currency, pushing down the value of some top names including Bitcoin. > The attack on the South Korea-based exchange, Bithumb, was smaller in value than some of the biggest hacks on cryptocurrencies. But it underscored the potential vulnerabilities for web-based trading and sent ripples across many cryptocurrency networks.