What Is an NFT? How Non-Fungible Tokens Actually Work
By NFTRanker Editorial · · 9 min read
An NFT, or non-fungible token, is a blockchain token designed to represent something individually distinguishable.
That definition is less exciting than “digital art you can own,” but it is much more useful.
A dollar is fungible. If you exchange one dollar for another dollar, you generally have the same thing.
Bitcoin works similarly: one BTC is intended to be interchangeable with another BTC of equal amount.
An NFT is different. Token #482 and Token #913 can belong to the same collection while having different artwork, traits, histories, owners, prices, and reputations.
That simple ability to make digital objects distinct is the idea everything else is built on.
NFTs Did Not Start With JPEGs
The history of NFTs begins before people called them NFTs.
In the early years of Bitcoin, developers were already asking a larger question:
Could a blockchain track more than money?
One early answer was Colored Coins.
Beginning in 2012, the Colored Coins idea proposed marking or “coloring” small amounts of bitcoin so they could represent something else: shares, property, collectibles, or other assets. Meni Rosenfeld published an early technical paper on the concept in December 2012, and further work followed in 2013.
Colored Coins never became the dominant way to create digital assets, but the important idea was already there: blockchain entries did not have to represent identical units of currency. They could represent distinguishable things.
Then came Quantum.
In 2014, digital artist Kevin McCoy minted Quantum on the Namecoin blockchain. Sotheby's describes it as the first NFT. It connected a blockchain token with a unique digital artwork years before the term “NFT” became mainstream.
The concept existed.
What it still lacked was a programmable ecosystem built around it.
Ethereum Made the Idea Easier to Generalize
Ethereum launched in 2015 with a much broader model than simply transferring currency.
Its smart contracts allowed developers to create programmable assets with their own rules.
That turned the basic idea behind NFTs into something developers could experiment with much more easily.
In 2017, CryptoPunks pushed the concept forward.
Larva Labs created 10,000 algorithmically generated pixel characters, each individually identifiable on Ethereum. CryptoPunks launched on June 23, 2017 and predated the finalized ERC-721 NFT standard.
Then CryptoKitties arrived later in 2017 and demonstrated that unique blockchain assets could become a consumer product rather than just a technical experiment.
Quantum, Etheria, Rare Pepes, Curio Cards, CryptoPunks, CryptoKitties and Autoglyphs are the projects collectors still argue about — though being early and being important turn out to be different things. See What Makes an NFT Historically Important?
The missing piece was standardization.
ERC-721 Gave NFTs a Common Language
Ethereum's ERC-721 standard formalized a common interface for non-fungible tokens.
The Ethereum Improvement Proposal, created in January 2018 by William Entriken, Dieter Shirley, Jacob Evans, and Nastassia Sachs, describes an NFT as a distinguishable asset whose ownership can be individually tracked.
Under ERC-721, an NFT is identified by the combination of:
- a smart contract address
- a unique token ID
Conceptually:
Contract: 0x123...
Token ID: 482
Owner: 0xabc...
That pair identifies one specific token.
Wallets, marketplaces, games, and other applications could now interact with NFTs using a shared set of rules instead of every project inventing an entirely new system.
That interoperability was a major step.
The important innovation was not that blockchains could store pictures.
It was that different applications could agree on what a unique digital object is, who owns it, and how it can move.
So What Is Actually Inside an NFT?
Usually, much less than people imagine.
An NFT can contain or reference information such as:
- its token ID
- its owner
- its smart contract
- metadata
- a URI pointing to additional information
- an image or other media reference
The artwork itself does not necessarily live on the blockchain.
Some projects store data fully on-chain. Others use decentralized storage systems such as IPFS. Others rely partly or entirely on conventional servers — a dependency with real consequences, because NFT infrastructure has a long history of shutting down around tokens that survive it.
So when someone says they “own the JPEG,” that is usually an oversimplification.
They own a token recorded by a blockchain, and that token may be associated with a particular piece of media.
What Does Owning an NFT Actually Mean?
At minimum, owning an NFT means a blockchain recognizes your wallet as the owner of that token.
Everything beyond that depends on the project.
An NFT might provide:
- collectible ownership
- access to a community
- game functionality
- event admission
- voting privileges
- commercial-use rights
- membership benefits
Some projects go further and turn each NFT into an onchain account that can hold assets of its own.
But NFT ownership does not automatically transfer copyright.
The blockchain can tell us which wallet owns a token.
It cannot, by itself, decide every legal or social right associated with the thing that token represents.
This distinction is important because blockchains are very good at answering narrow questions such as:
Which address currently controls token #482?
They are not magical truth machines capable of answering every question about value, identity, copyright, or legitimacy.
Why Can NFTs Be Valuable?
A blockchain can prove that a token is scarce.
It cannot force anyone to care about that scarcity.
That difference explains much of the NFT market.
NFTs can derive value from several overlapping sources:
- Scarcity — how uncommon the token or its traits are.
- Aesthetics — whether people actually like how it looks.
- Provenance — its creator and ownership history.
- Utility — what owning it allows someone to do.
- Culture — the collection's importance to a community.
- Demand — how many people want to own it.
These sources are weighted differently in every community, which is why collections as different as Pudgy Penguins and Milady Maker can each command devoted followings for almost opposite reasons.
A rare NFT is not automatically desirable.
A common NFT is not automatically undesirable.
The blockchain can make scarcity measurable. Human preference remains human.
That distinction is especially important for NFT rankings.
Where NFTRanker Fits In
Most NFT ranking systems begin with something easy for computers to measure: traits and rarity.
NFTRanker asks a different question.
Which NFTs do people actually prefer?
On NFTRanker, users choose between two NFTs from the same collection in head-to-head matchups. Those results feed an Elo-style ranking system that changes as the community votes.
This is deliberately different from a rarity calculator.
Consider two NFTs:
NFT A
Rare traits: 4
Rarity rank: #83
NFT B
Rare traits: 1
Rarity rank: #2,140
A rarity model will probably prefer NFT A.
But show the pair to thousands of people and NFT B may consistently win.
That does not mean the rarity score is wrong.
It means rarity and preference are measuring different things.
Rarity asks: “How statistically unusual is this NFT?”
NFTRanker asks: “When people have to choose, which NFT do they prefer?”
Price provides another signal again: what someone was willing to pay at a particular moment.
None of these measurements is the complete truth.
Together, they give us a more interesting picture of how digital collectibles are valued.
Are NFTs Just Digital Art?
No.
Digital art became the most visible NFT use case, but ERC-721 was designed around the broader concept of distinguishable assets.
NFTs can represent:
- digital collectibles
- game items
- memberships
- tickets
- domain names
- certificates
- virtual land
- identity primitives
- tokenized physical assets
Whether every one of those things should use an NFT is a different question.
A blockchain is useful when shared ownership records, interoperability, or permissionless transfer provide enough value to justify the complexity.
Putting something on-chain does not automatically improve it.
Are NFTs Dead?
NFT speculation has gone through dramatic boom-and-bust cycles.
That does not make the underlying idea disappear.
Colored Coins explored distinguishable blockchain assets in 2012. Quantum appeared in 2014. CryptoPunks arrived in 2017. ERC-721 standardized NFTs in 2018.
The technology existed before the speculative boom, and it continues to exist after it.
The more useful question is not whether “NFTs” as a category are alive or dead.
It is:
Does this particular digital object, collection, or ownership system give people a reason to care?
A blockchain can create verifiable scarcity.
It cannot create meaning.
Communities do that.
The Simple Definition
If you remember only one thing, remember this:
An NFT is a unique blockchain token that allows a digital asset or right to be identified and owned separately from other tokens.
The image is not the fundamental invention.
The fundamental invention is the ability for many independent computers and applications to agree that this particular digital thing is different from all the others.
Once that distinction exists, we can build markets around it.
We can measure rarity.
We can observe prices.
And, with systems like NFTRanker, we can measure something the blockchain itself cannot tell us:
which ones people actually like.
Frequently Asked Questions
What does NFT stand for?
NFT stands for non-fungible token. “Non-fungible” means the token is individually distinguishable rather than interchangeable like dollars or units of cryptocurrency.
Who created the first NFT?
Kevin McCoy's Quantum, minted on Namecoin in 2014, is widely recognized as the first NFT.
When were NFTs invented?
The ideas behind NFTs developed gradually. Colored Coins explored distinguishable blockchain assets beginning in 2012, Quantum was minted in 2014, CryptoPunks launched in 2017, and ERC-721 was formalized in 2018.
Is an NFT the same as a JPEG?
No. The NFT is the blockchain token. An image or other media can be associated with the token through metadata or a URI and may be stored on-chain or elsewhere.
Does buying an NFT give you copyright?
Not automatically. Copyright and commercial rights depend on the license or terms associated with the collection.
What was ERC-721?
ERC-721 established a standard interface for non-fungible tokens on Ethereum, making it easier for wallets, marketplaces, and applications to recognize and transfer unique tokens.
Why do some NFTs cost more than others?
Price can be influenced by rarity, aesthetics, provenance, utility, cultural significance, market conditions, and demand.
How does NFTRanker rank NFTs?
NFTRanker uses head-to-head community voting and an Elo-style rating system. Instead of calculating which NFT is statistically rarest, it measures which NFTs users prefer when directly compared.