LiveArtX said the exploit apparently occurred after an individual gained access to the private key of the Seven Treasures collections, after which they could sell all the NFTs. A private key is a secret number used in blockchain technology, similar to a password, that allows its holders to access, transfer and change information about the data or tokens of that private key.
Source: https://www.coindesk.com/tech/2022/10/17/liveartxs-seven-treasuries-nft-collection-stolen-exploiter-breaks-floor-price/?utm_medium=referral&utm_source=rss&utm_campaign=headlines