Non-Fungible Token (detailed)
A non-fungible token (NFT) is a unique, indivisible cryptographic token recorded on a blockchain that proves provenance and ownership of a specific digital or physical item, with each token distinguished by a unique identifier that makes it non-interchangeable with any other token, even those in the same collection.
Fungibility refers to the property of being mutually interchangeable: one US dollar is equivalent to any other US dollar; one Bitcoin is equivalent to any other Bitcoin. Non-fungible tokens break this equivalence by assigning each token a unique identifier within a smart contract, making no two tokens the same. This property makes NFTs suitable for representing digital art, in-game items, domain names, event tickets, real estate titles, and any other asset where individual identity and provenance matter.
The technical standard most commonly associated with NFTs on Ethereum is ERC-721, introduced in 2018, which defines a minimum interface for non-fungible ownership: a unique tokenId, an owner address, and a transfer function. The ERC-1155 standard extended the model to support both fungible and non-fungible tokens within a single contract — useful for gaming applications where a game might issue one-of-a-kind character skins alongside thousands of identical in-game currency tokens. Solana, Flow, Tezos, and other blockchains have their own NFT standards with similar functional properties.
NFT metadata — the actual image, audio, or other content that the token represents — is typically not stored on the blockchain itself due to cost and storage constraints. Instead, the token contains a URI pointing to an off-chain storage location, commonly IPFS (InterPlanetary File System) for decentralized storage or centralized cloud storage for projects that prioritize cost over permanence. The distinction matters for buyers: an NFT pointing to IPFS content will persist as long as the content is pinned, while one pointing to a centralized server loses its associated content if the server is taken down.
The NFT market experienced an extraordinary speculative cycle in 2021 and early 2022. Collections such as CryptoPunks, Bored Ape Yacht Club, and Art Blocks commanded prices in the hundreds of thousands to millions of dollars per token, driven by a combination of genuine collector enthusiasm, celebrity endorsements, brand licensing opportunities, and speculative trading. Total NFT market volume exceeded 25 billion dollars in 2021 before collapsing sharply in 2022 alongside broader crypto market conditions.
US regulatory treatment of NFTs is evolving. The SEC has indicated that NFTs with investment characteristics — fractionalized NFTs, those marketed for their profit potential, or those tied to royalty streams — may constitute securities. The CFTC has asserted jurisdiction over NFTs tied to commodity assets. Several state money-transmission regulators have examined whether NFT marketplace operators require licensing. Globally, the EU MiCA regulation explicitly excludes unique NFTs from its scope, though fractionalized NFTs with financial characteristics may fall within it. For participants in the NFT market, understanding these regulatory contours — as well as the intellectual property rights actually conveyed by ownership of an NFT, which typically do not include copyright — is essential to evaluating the legal nature of any acquisition.