What Are NFTs and How Do They Work?

Not financial, legal, or tax advice. NFT values are highly speculative and can fall to near zero.

An NFT, or non-fungible token, is a unique, non-interchangeable token on a blockchain, typically used to represent ownership of a specific digital or real-world item. Unlike a coin, where every unit is identical and interchangeable, each NFT is distinct, part of the broader landscape of crypto tokens. The Ethereum Foundation maintains a plain-language overview of how they are minted and traded.

Definition

"Non-fungible" means each token is unique and not directly interchangeable with another, unlike a currency where one unit equals any other unit of the same value.

Fungibility is a duller word than it deserves to be, and the distinction is genuinely useful. Any ten-dollar bill will do when you owe someone ten dollars, because bills are interchangeable; that is fungibility. Concert tickets are not: seat 4A and seat 22F are both tickets and they are not the same thing, and swapping one for the other is a real change. NFTs are the second kind, and the technical achievement is narrow but real: a way to have a distinct, individually identifiable thing on a ledger, rather than a balance.

How they're minted

Creating an NFT, called minting, involves recording a unique token on a blockchain, often linked to a specific digital file or metadata describing what it represents. That record of ownership, not necessarily the underlying file itself, is what the blockchain actually tracks.

That sentence contains the single most important and least understood fact about NFTs, so it is worth spelling out. The image is almost never on the blockchain. Storing a picture on-chain would be extravagantly expensive, so the token typically holds a link to a file hosted somewhere else, on a normal server or a distributed storage network. What you own, in the strictest technical sense, is a ledger entry containing a pointer.

Which means the durability of an NFT depends on infrastructure the blockchain does not control. If the server hosting the file goes away, the token remains, permanently, pointing at nothing. This has happened, repeatedly, to collections whose creators lost interest or ran out of money. The permanence people are buying attaches to the record of who owns the pointer, not to the thing at the end of it.

Use cases

NFTs have been used for digital art and collectibles, event tickets, and increasingly for representing ownership of real-world assets. Tokenizing real-world assets is the broader version of the same trend.

The art and collectibles boom is the part everyone remembers, and it is the least representative use of the technology. Strip away the pictures and what remains is a general-purpose mechanism for tracking unique things and their owners without a central registry, which turns out to be useful in unglamorous places: event tickets that cannot be counterfeited and whose resale terms are enforced automatically, in-game items that survive the game studio, domain names, memberships, and credentials.

Most of those are quietly working while the market for expensive avatars collapsed. That is a familiar pattern in technology, and it is worth separating the mechanism from the mania that introduced it.

Risks and hype caution

NFT markets have seen extreme speculative cycles, with many items losing most or all of their value once hype faded. Ownership of an NFT doesn't automatically confer copyright or other legal rights to the underlying content, which is a common point of confusion.

The copyright point deserves emphasis, because a great many people got this wrong at considerable expense. Buying an NFT of an artwork does not, by default, give you any rights to the artwork. Not copyright, not reproduction rights, not the ability to stop anyone else from copying the image, which they can do with a right-click. Whatever rights come with a purchase come from the terms the creator attached, which are ordinary legal terms enforced by ordinary courts, and in most collections those terms granted very little.

The liquidity risk is the other one that reliably surprises people. NFT markets are thin by construction: each item is unique, so there is no order book of identical units to sell into, and a "floor price" is simply the cheapest listing rather than a price anyone has agreed to pay. When enthusiasm fades, the gap between the last sale and the next bid can be total, and holders discover that a valuable collectible with no buyer is not valuable at all.

None of which makes the technology fraudulent. It makes the market a speculative one, in a category with genuine utility attached and a spectacular history of losses, and worth approaching with money you have decided you can lose.

What you actually own

Pulling the threads together, it is worth stating precisely what an NFT purchase gets you, because the answer is narrower than the enthusiasm suggested and more interesting than the backlash allows. You own a ledger entry, on a public blockchain, recording that a particular token belongs to your address. That entry is genuinely yours: nobody can take it, forge it, or quietly reassign it, and it will still be there in twenty years.

What that entry means is entirely a matter of what everyone else agrees it means. If the collection's creator says it grants membership, it grants membership for as long as they honor that. If a game says it is a sword, it is a sword while the game exists. If it points at an image, it points at an image for as long as somebody pays the hosting bill. The blockchain guarantees the record and guarantees nothing about the meaning attached to it.

That is not a scandal; it is how titles and deeds have always worked. A property deed is a piece of paper whose power comes from a legal system agreeing to enforce it. The difference is that the legal system has a few centuries of practice, and an NFT's meaning usually rests on the continued interest of a project that may not exist next year. Knowing which of those you are relying on is most of the analysis.

The standards themselves are worth a sentence, since you will see them referenced. ERC-721 is the original: one contract, many unique tokens, each individually owned. ERC-1155 came later and handles both unique and interchangeable tokens in a single contract, which suits games where you might hold one unique sword and five hundred identical arrows. Both are Ethereum standards, and other chains run their own equivalents. As with fungible tokens, the standard guarantees the token behaves predictably in your wallet and guarantees nothing about whether it is worth anything.