Nick Bax, head of research at NFT organization Convex Labs tested out how NFT marketplaces like OpenSea allow vendors or attackers to harvest IP addresses. He created a listing for a Simpsons and South Park crossover image, entitling it “I just right click + saved your IP address” to prove that when the NFT listing is viewed, it loads custom code that logs the viewer’s IP address and shares it with the vendor.
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Source: Cryptocurrency - investing.com