Exploited system was audited twice
https://www.bleepingcomputer.com/news/security/hackers-steal-6-million-from-blockchain-music-platform-audius/
The decentralized music platform Audius was hacked over the weekend, with threat actors stealing over 18 million AUDIO tokens worth approximately $6 million.
Audius is a decentralized streaming platform hosted on the Ethereum blockchain where artists can earn AUDIO tokens by sharing their music, and users can earn tokens by curating and listening to content.