Cryptocurrency exchange hack in South Korea robs holders of $46 bn

A cryptocurrency exchange hack in South Korea jolted holders of digital assets, fueling a $46 billion rout and extending this year’s Bitcoin slump to more than 50 percent.

The hack brought an abrupt end to two weeks of calm for the biggest virtual currency and reignited concerns about the security of lightly regulated crypto exchanges. The venues have come under growing scrutiny in South Korea, the U.S. and other large economies in recent months amid a range of issues including thefts, market manipulation and money laundering.

Bitcoin has dropped 11 percent since 5 p.m. New York time on Friday and was trading