OpenSea is the first and largest marketplace for user-owned digital goods, which include collectibles, gaming items, domain names, digital art, and other assets backed by a blockchain. These items are known as non-fungible tokens (NFTs), and they come in all shapes and sizes. On OpenSea, one will find everything from animated artistic works made by some of the internet's most recognized creators to clothes one can wear in community-built virtual realities. Brands and individuals can use OpenSea to create, buy, sell, and trade NFTs with anyone in the world via decentralised smart contracts, meaning that no central authority ever holds custody of the items. Instead, users store the NFTs in crypto wallets. The core currencies on OpenSea are Ethereum (ETH), USDC, and DAI.