What are Non-fungible Tokens (NFT)?

Non-fungible tokens, or NFTs, exploded into mainstream attention in 2021 when a single piece of digital art by Beeple sold for $69 million. The hype has cooled since, but the technology behind NFTs has matured and now powers everything from video game items to event tickets and tokenized property deeds.

This guide explains what NFTs are, how they work, the standards behind them, and where the market stands today.

What are non-fungible tokens?

An NFT is a unique digital asset recorded on a blockchain. The word “non-fungible” means it cannot be exchanged on a one-for-one basis with another token of the same kind. One Bitcoin is interchangeable with any other Bitcoin, but every NFT is distinct, with its own identifier and metadata.

That uniqueness is what makes NFTs useful for representing ownership of specific items: a particular piece of art, a numbered concert ticket, a deed to a virtual plot of land, or a single in-game weapon. The blockchain record acts as a public, tamper-resistant certificate of authenticity.

How NFTs work

An NFT is created (or “minted”) through a smart contract that issues a token with a unique ID and a link to its associated content. That content is usually stored off-chain on a decentralized file system such as IPFS, while the on-chain token records who owns it.

Once minted, the NFT can be transferred, sold, or held in a crypto wallet. Every transfer is logged on the blockchain, producing a permanent ownership history that anyone can inspect.

Most NFTs also include a royalty mechanism. The original creator can set a percentage (commonly 5 to 10 percent) that they receive automatically every time the NFT is resold on a participating marketplace. Royalty enforcement varies by platform and has become a contentious topic in the market.

NFT standards: ERC-721 and ERC-1155

Two token standards on Ethereum dominate the NFT space:

• ERC-721 is the original NFT standard. Each token issued under ERC-721 is fully unique, with its own ID and metadata. It is the standard used by collections like CryptoPunks and Bored Ape Yacht Club.
• ERC-1155 is a multi-token standard developed by Enjin. A single ERC-1155 contract can manage many different token types, including both fungible and non-fungible tokens, which makes it more efficient for games and large collections.

Other blockchains have their own equivalents. Solana uses the Metaplex standard, Tezos uses FA2, and Cardano supports native NFTs without a separate token standard. Cross-chain bridges allow some NFTs to move between networks, though most collectors and marketplaces remain Ethereum-centric.

Use cases for NFTs

Beyond profile-picture art, NFTs are used in a growing list of practical applications.

Digital art and collectibles

The original use case. NFTs let artists sell verifiable, scarce versions of digital work directly to collectors and earn royalties on every secondary sale.

Gaming and virtual worlds

NFTs represent in-game items, characters, and land that players truly own and can trade outside the game. Titles like Axie Infinity, Illuvium, and The Sandbox built their economies around this model.

Ticketing and event access

Concert tickets, conference passes, and membership credentials issued as NFTs are harder to forge and easier to verify. They can also unlock perks for the holder long after the event.

Identity and credentials

Diplomas, professional certifications, and proof-of-attendance tokens (POAPs) issued on-chain create a portable, tamper-resistant credential record.

Real-world asset tokenization

Property deeds, luxury watches, and fine art are increasingly being represented by NFTs that tie a physical item to a unique on-chain record. This is closer to a legal registry than a collectible market.

Domain names

Services like Ethereum Name Service (ENS) issue human-readable wallet addresses (such as alice.eth) as NFTs, which makes them tradable and recoverable.

Famous NFT collections

A handful of collections defined the early NFT era and still set price benchmarks for the wider market:

• CryptoPunks launched in 2017 by Larva Labs, this set of 10,000 pixel-art characters is considered the first major Ethereum NFT collection.
• Bored Ape Yacht Club (BAYC) released in 2021 by Yuga Labs, BAYC became the cultural face of the NFT boom, with celebrity holders and a sprawling ecosystem of spin-offs.
• Art Blocks a generative-art platform that produces collections programmatically. Each piece is unique because the artwork is generated at mint time using on-chain randomness.
• Pudgy Penguins a community-driven collection that pivoted into consumer brand merchandise and toys, pioneering the “NFT IP” model.

Where to buy and sell NFTs

NFTs are bought and sold on dedicated marketplaces. The largest by Ethereum trading volume include OpenSea, Blur, and Magic Eden. Each operates as a platform where collectors connect a wallet, browse listings, and trade NFTs peer-to-peer through smart contracts.

Most marketplaces charge a platform fee (typically 0.5 to 2.5 percent) and pass royalties to the original creator. Royalty enforcement, however, has weakened: several platforms made creator royalties optional in 2022 and 2023 in response to fee-sensitive trading volume.

NFTs and DeFi

NFTs and DeFi have grown closer over time. The simplest connection is collateral: NFT-backed lending protocols let an owner borrow stablecoins against a high-value NFT without selling it. Platforms like Blend (Blur) and BendDAO offer this kind of loan.

NFTs are also being used to represent more complex financial positions. A liquidity provider position on Uniswap v3, for example, is itself an NFT, because each position has unique parameters (price range, fee tier) that cannot be represented by a fungible token. This pattern is spreading: insurance policies, structured products, and tokenized real estate increasingly use NFTs to capture position-specific data.

Risks and criticisms

The NFT market carries significant risks, both technical and economic.

• Price volatility floor prices for top collections fell 80 to 95 percent from their 2022 peaks. Many projects from that era are now functionally worthless.
• Wash trading coordinated buy-and-sell activity to inflate volume and prices. Studies have estimated that more than half of all NFT trading volume in 2022 was wash trading.
• IP theft stolen artwork is regularly minted as NFTs without the artist’s consent. Marketplaces have improved detection but the problem persists.
• Smart contract bugs a flaw in the minting or marketplace contract can drain funds or freeze assets. Several NFT projects have suffered exploits worth millions.
• Off-chain storage if the artwork itself is hosted on a centralized server rather than IPFS, the NFT can become a broken link if that server disappears.
• Phishing NFT holders are heavily targeted by wallet-draining scams, including fake mint sites and malicious airdrops.

The current state of the NFT market

Trading volume is a fraction of the 2022 peak. The headline numbers from the boom have faded, and the speculative profile-picture trade is largely quiet. What is left is a smaller but more practical market.

Activity has shifted toward use cases with clearer utility: gaming items, ticketing, on-chain identity, and tokenized real-world assets. Major brands continue to experiment with NFT loyalty programs, and institutional issuers are exploring NFTs as a wrapper for real-world financial instruments.

For newcomers, NFTs are best understood as a primitive for digital ownership, not as an investment thesis. The technology will likely outlast the cultural moment that introduced it, but the market for any individual collection remains highly speculative.