A bug in OpenSea, an online marketplace for crypto collectibles and NFTs, has reportedly allowed attackers to buy rare NFTs at steep discounts and sell them for a significant profit, causing thousands of dollars in losses for the original creators/owners.
The bug, which was first noticed on December 31, 2021, allows users to transfer their NFTs to other wallets without technically delisting them from the marketplace, to avoid the delisting fee. Attackers have purchased these NFTs by scanning the blockchain for pending transactions using bots, through OpenSea APIs, despite the assets not being visible for sale in the marketplace.
Blockchain analytics company Elliptic reported that the bug was exploited at least eight times to obtain NFTs with over USD 1 million in market value, during the 12 hours before the morning of January 24. In one instance, one attacker had purchased seven NFTs for USD 133,000 and quickly resold them for USD 934,000 on Ether.
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