Ronin hacked for ~$620MHappened on March 29th, 2022
Hackers managed to get access to private keys to validator nodes resulting in the compromise of five validator nodes, which is also the threshold required to approve a transaction. The Ronin chain currently consists of nine validator nodes and the hacker managed to get access to four of them along with a third-party validator run by decentralized autonomous organization (DAO) Axie DAO. According to reports, they compromised the network by scouting a senior engineer at Axie Infinity and duped them into applying for a job at a company that, in reality, did not exist. They infected the machine with an infected PDF file.