NFTs (Non-Fungible Tokens) are blockchain-based tokens that represent unique ownership of a specific asset. After a speculative bubble in 2021–2022, the market collapsed by 95%+. In 2026, NFTs are a fraction of their peak but have found genuine use cases in gaming, ticketing, and digital identity.
Regular cryptocurrencies (BTC, ETH) are fungible — each unit is identical and interchangeable. One Bitcoin is exactly the same as any other Bitcoin. NFTs are non-fungible — each token has a unique identifier and is distinct from all others, even within the same collection.
This uniqueness is enforced by the blockchain. An NFT's ownership history, creator royalties, and metadata are stored on-chain, making it impossible to duplicate or forge.
Most NFTs use the ERC-721 or ERC-1155 standard on Ethereum (or its L2s). Each token has a unique tokenId that maps to metadata — typically a JSON file pointing to the actual image or asset, usually stored on IPFS (InterPlanetary File System) to prevent centralised deletion.
When you "buy an NFT," you're purchasing ownership of the token ID on the blockchain. The underlying file (image, video) is usually not stored on-chain — only the pointer is, which is why NFTs of deleted images have caused controversy.
Polymarket has run markets on NFT-related events including "Will OpenSea revenue exceed $X in 2025?" and specific collection floor price predictions. These markets are niche but attract sophisticated collectors who have informational advantages in understanding community sentiment.