Fungible vs. Non-Fungible: What's the Difference?
To understand NFTs, start with "fungible." A dollar bill is fungible — swap it for another dollar bill and you have exactly the same value. One Bitcoin equals any other Bitcoin. Fungible assets are interchangeable.
A non-fungible token (NFT) is the opposite. Each NFT is unique — it carries distinct metadata and a unique identifier on the blockchain that makes it one-of-a-kind. You can't swap one NFT for another and expect to receive the same thing, just like swapping an original painting for a print.
How NFTs Work Technically
NFTs are created (or "minted") on a blockchain — most commonly Ethereum, though Solana, Polygon, and others are also popular. The minting process records the token's metadata on-chain, including:
- A unique token ID
- The contract address of the collection
- A pointer to the asset (image, video, audio file — typically stored on IPFS)
- Ownership history and transfer records
The blockchain acts as a public, permanent ledger of who owns what — no central authority required.
What Can Be an NFT?
The NFT standard (most commonly ERC-721 on Ethereum) can represent ownership of virtually any unique digital or physical asset:
- Digital art — images, animations, generative art
- Music & audio — songs, albums, sound effects
- Collectibles — trading cards, in-game items, virtual land
- Event tickets — verifiable, transferable, anti-counterfeit
- Domain names — decentralized web identities (e.g., ENS names)
- Real-world assets — tokenized property deeds, luxury goods authentication
NFT Marketplaces
| Marketplace | Blockchain | Best For |
|---|---|---|
| OpenSea | Ethereum, Polygon | General art & collectibles |
| Magic Eden | Solana, Bitcoin | Solana-native collections |
| Blur | Ethereum | Pro traders & high volume |
| Zora | Ethereum, Base | Creator-focused minting |
NFT Royalties: Empowering Creators
One of NFTs' most significant innovations for creators is programmable royalties. A creator can embed a royalty percentage (e.g., 5–10%) into the smart contract, so every time the NFT is resold on a secondary market, they automatically receive a cut — no middlemen, no invoices.
Note: Royalty enforcement has become a contested topic among marketplaces, so it's worth checking how a specific platform handles creator royalties before minting.
Common Misconceptions
"Anyone can right-click and save the image." True — but that doesn't grant ownership. Owning an NFT is like owning a signed original painting: copies exist, but verified provenance lives on the blockchain.
"NFTs are just JPEGs." The image is just one application. NFTs are a mechanism for verifiable, transferable digital ownership — a primitive that underpins gaming, identity, ticketing, and much more.