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OpenSea is a decentralized marketplace for buying and selling non-fungible tokens (NFTs) on the Ethereum blockchain. It was founded in 2017 by Devin Finzer and Alex Atallah, and has since become one of the largest NFT marketplaces in the world.

OpenSea allows users to buy, sell, and discover a wide range of NFTs, including digital art, collectibles, gaming items, virtual real estate, and more. Users can also create and sell their own NFTs, with OpenSea handling the storage and transfer of the assets on the Ethereum blockchain.