Over the weekend, blockchain security companies and experts have linked North Korea's Lazarus hacking group to the theft of over $1.5 billion from cryptocurrency exchange Bybit.

Cryptocurrency exchange Bybit said last week hackers had stolen digital tokens worth around $1.5 billion, in what researchers called the biggest crypto heist of all time.

Less than 72 hours later, Zhou said Bybit had restored the exchange’s balance and kept customer withdrawals open, although he did not account for the stolen crypto. The scale of the Bybit theft surpasses the previous record of a $615 million heist of Ethereum and U.