You can use OpenSea for NFT sales that involve a legal transfer of physical goods or rights, but it is the seller’s responsibility to both:

a) ensure the legality of that transfer, and
b) coordinate with the buyer in order to ensure those items are delivered as expected.
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Our involvement with these sales only goes so far as the transfer of the digital item. Buyers should make sure there is a way to coordinate with the seller for any off-platform transfers before committing to purchase a digital item.
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For more information, read through our User Safety guides and Terms of Service.