South Korean Cryptocurrency Exchange Coinrail Reports Hacking

South Korean cryptocurrency exchange Coinrail said it was hacked over the weekend, prompting an extended sell-off of bitcoin to a 2-month low amid growing concerns about security at small- to mid-sized virtual currency exchanges. In a statement on its website, Coinrail said its system was under “cyber intrusion,” causing a loss for about 30 percent of the coins traded on the exchange.