A North Korea-linked hacker group stole digital assets worth 48.2 billion yen ($307 million) from Tokyo-based cryptocurrency exchange DMM Bitcoin Co. in May, Japanese police said Tuesday.The hacker group was identified by the police as TraderTraitor following an investigation conducted in collaboration with the U.S. Department of Defense and the Federal Bureau of Investigation.DMM Bitcoin said earlier this month it will go out of business after suspending some of its services following the detection of the unauthorized leakage of funds on May 31.The police tracked the flow of stolen bitcoin…READ FULL ARTICLE