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South Korean cryptocurrency exchange Gopax suspended its virtual asset deposit, withdrawal, and trading services on Nov. 6 after receiving a threatening email from a group claiming to have hacked the exchange, Yonhap and other Korean outlets report. The exchange stopped withdrawals at 2:55 p.m., moved most of its hot wallet assets to an offline cold wallet, and halted trading at 3:53 p.m., according to Chosun Ilbo and Kyunghyang Shinmun. Gopax said it took the emergency measures to protect user assets, and it plans to transfer all held virtual assets to the cold wallet. The move comes amid growing security concerns in the industry, with reports of recent hacking and personal data leaks in the financial sector and a reported up to $6.3 billion hack at Binance, the world's largest exchange, Chosun Ilbo notes.