Bybit was exploited for over $1.4 billion Friday, rocking the crypto industry to the core, as it easily became the largest single heist in crypto history.

Arkham Intelligence announced that onchain security sleuth ZachXBT has identified the Lazarus Group, a North Korean hacker group, as being behind the $1.46 billion Bybit hack on Feb. 21. Arkham set up a bounty to identify the person or organization behind the attack with a reward of 50,

Crypto exchange Bybit said it was hacked, resulting in what analysts estimate was the loss of almost $1.5 billion worth of tokens in the biggest theft ever committed in the industry. Researchers believe North Korean hackers were likely responsible.