Earlier this year, the Tokyo-based exchange Coincheck reported a $547 million loss of a cryptocurrency called NEM from suspected criminal hacking.
source https://www.google.com/url?rct=j&sa=t&url=https://www.cbc.ca/news/business/crytocurrency-hackers-japan-1.4831380&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNEePdfKG6QW6K1s_VZfGNvM_dc_XA
