https://motherboard.vice.com/en_us/article/ne4xdk/a-cryptocurrency-theft-bigger-than-mt-gox-just-happened-in-japan-coincheck-nem > A Japanese cryptocurrency exchange says it just experienced what may be the most financially damaging marketplace theft in the history of the technology. > The sum allegedly stolen from the Coincheck exchange—500 million units of NEM, a newer cryptocurrency—was worth roughly $500 million USD at the time of the theft, which would eclipse even the alleged 2014 hack of Japanese exchange Mt. Gox. That incident saw $450 million USD worth of Bitcoin go missing and embroiled founder Mark Karpeles in a legal drama that is still ongoing nearly four years later. According to Japanese newspaper Asahi, Coincheck has alerted police to the theft.