An NFT (non-fungible token) is a unique token on a blockchain that records who owns a specific item. "Non-fungible" just means each one is distinct and not interchangeable, unlike a coin where every unit is identical. When you buy one, what you reliably own is an entry on the blockchain pointing to that item — which is not the same as owning the underlying file or its copyright. Understanding that gap is the whole point.
Fungible vs non-fungible
Most crypto tokens are fungible: one USDC is exactly like any other, the way one $10 note equals another. NFTs are the opposite. Each token has its own identity and can represent one particular thing — a specific artwork, ticket, or in-game sword.
On Ethereum, NFTs follow token standards that wallets and marketplaces understand:
- ERC-721 — one token, one unique item.
- ERC-1155 — a single contract that can issue both unique and multi-copy items, handy for games and editions.
What the blockchain actually stores
A common misunderstanding is that the image "lives on the blockchain." Usually it does not. An NFT typically stores:
- A token ID and the owner's address (this part is on-chain and secure).
- A link to metadata — the name, traits, and a URL to the image or file.
Where that metadata and file live matters a lot:
- Off-chain (a normal web server). Cheap, but if the server goes down or the link rots, your NFT can point to nothing.
- Decentralised storage (IPFS, Arweave). More durable, content-addressed so it can't be silently swapped.
- Fully on-chain. The art itself is stored in the contract. Rare and expensive, but permanent.
So the strong guarantee is "this address owns token #1234 in this contract." Whether the picture behind it survives depends on where it is hosted.
What you own — and what you don't
| You generally get | You generally do NOT get (unless stated) |
|---|---|
| A verifiable on-chain record that you hold the token | The copyright to the artwork |
| The right to sell or transfer the token | The right to stop others copying the image |
| Whatever the project grants holders (access, licence, perks) | Control over where the file is hosted |
Owning an NFT is like owning a signed certificate of a particular entry, not automatically owning the intellectual property. Some projects do grant broad commercial rights to holders, but that is a choice spelled out by the project, not a built-in feature of NFTs. Always check the project's stated licence.
The "right-click and save the image" criticism misses this point: anyone can copy the file, but only one address holds the token the ecosystem treats as the original.
Uses beyond digital art
NFTs started with profile-picture art, but the underlying idea — a unique, transferable, verifiable token — has broader uses:
- Event tickets that can't be forged and can carry resale rules.
- In-game items a player truly owns and can trade.
- Domain names like ENS (
yourname.eth) that double as wallet addresses. - Memberships and access passes to communities or software.
- Certificates and credentials such as proof of completion or authenticity.
Risks to understand
- Liquidity and price. Many NFTs are thinly traded; a "floor price" can be far above what you can actually sell for, and values can collapse.
- Wash trading. Some volume is faked by people trading with themselves to inflate interest.
- Metadata fragility. If the image is on a server that disappears, your token may point to a dead link.
- Royalties aren't guaranteed. Creator royalties are enforced by marketplaces, not the blockchain, so they can be bypassed.
- Scams. Fake mints, copied collections, and malicious approvals are common. Verify the official contract and never sign transactions you don't understand.
Because standards, marketplaces and royalty rules keep changing, treat the specifics here as a snapshot and check a project's current terms before buying.
Key takeaways
- An NFT is a unique, non-interchangeable token that records ownership of a specific item on a blockchain.
- The on-chain part — which address owns which token — is secure; the image is usually stored off-chain.
- Buying an NFT gives you the token, not automatically the copyright or the file.
- Durability depends on where the metadata and file are hosted; decentralised or on-chain storage is safest.
- Beyond art, NFTs can represent tickets, game items, domains, memberships and credentials.
- Watch for thin liquidity, wash trading, dead metadata links, unenforced royalties, and mint scams.
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