OpenSea is the world's largest decentralized marketplace for buying, selling, and discovering non-fungible tokens (NFTs). Founded in 2017 by Devin Finzer and Alex Atallah, OpenSea has become a central hub for digital collectibles, art, music, virtual real estate, and more, operating on multiple blockchains including Ethereum, Polygon, Solana, and Avalanche. Complete these tasks to position for Opensea $SEA Airdrop.