NFTs Basics: How Non-Fungible Tokens Actually Work

What an NFT Is

A fungible token is interchangeable. One USDT is equivalent to any other USDT. One BTC is equivalent to any other BTC. If you send me one of your USDT and I send one of mine back, we're in the same position.

A non-fungible token isn't interchangeable. Each NFT has a unique ID. CryptoPunk #5822 is different from CryptoPunk #1423. Bored Ape #3749 is different from Bored Ape #8817. Even if they're in the same collection, they're distinct tokens with different metadata.

Mechanically, NFTs are smart contracts that implement a specific standard (ERC-721 being most common). The contract maintains a registry of which address owns which unique token ID. When you "buy an NFT," the contract transfers ownership of that specific token ID from seller to buyer.

NFT Standards

ERC-721

The original NFT standard on Ethereum, introduced in 2017. Each token is unique. Transfer, balance check, and approval functions are standardized so wallets and marketplaces can interact with any ERC-721 contract.

Every major Ethereum NFT collection (CryptoPunks retroactively wrapped, Bored Apes, Azuki, Doodles, Art Blocks) is ERC-721.

ERC-1155

A semi-fungible standard introduced by Enjin. A single contract can hold many different token IDs, some unique and some with multiple copies. Useful for game items (1,000 copies of a specific sword + one unique Legendary sword all in one contract) and collections with varying rarity.

Solana and Metaplex

Solana NFTs use the Metaplex token standard. Metaplex integrates with Solana's SPL token architecture and supports programmable royalties, compressed NFTs (for cheap mass issuance), and other features that evolved from ERC-721.

Bitcoin Ordinals

Ordinals inscribe data directly into Bitcoin transaction witness space. Each inscription is a Bitcoin-native NFT. Ordinals launched in January 2023 and have since produced significant Bitcoin transaction fee revenue, consumed block space aggressively, and spawned a parallel NFT ecosystem.

Metadata and Storage

An NFT contract typically stores just a token ID and a URI pointing to metadata. The metadata (a JSON file with the image URL, attributes, and description) lives outside the blockchain. The image itself lives at the URL the metadata references.

Storage options:

• IPFS: decentralized peer-to-peer content addressing. Pin services (Pinata, Filebase, Infura) ensure content remains retrievable.
• Arweave: pay-once-for-permanent-storage protocol. Funds an endowment that covers long-term hosting.
• On-chain: the metadata and image are stored directly in the contract. Much more expensive (Ethereum storage costs) but fully permanent.
• Centralized servers: AWS S3, websites. Cheapest and least permanent. If the server goes down, the NFT's art disappears.

The biggest NFT collections increasingly use IPFS or fully on-chain storage for permanence. Many smaller or older NFT projects rely on centralized storage. If you hold those NFTs and the project team abandons the server, the "art" is gone even though the token on-chain survives.

NFT Marketplaces

Marketplaces aggregate listings and handle buying/selling. The largest:

Marketplaces typically charge a fee (2-2.5%) plus creator royalties (historically 5-10%, now widely optional or on-chain-enforced).

The 2021-2022 Bubble and Collapse

NFT speculation exploded in 2021 and peaked in early 2022. Ethereum NFT volumes reached over $5B per month during peak months. Bored Ape Yacht Club floor prices reached 150+ ETH (~$500K+). Thousands of new collections launched weekly.

The collapse was violent. By mid-2023, NFT volumes had dropped 95%+. Most 2021-era PFP projects traded at 1-5% of peak prices. Blue-chip collections (CryptoPunks, BAYC) held better but still down 70-85% from peaks.

What failed:

• Pure speculation: projects with no utility beyond rarity-trait gambling
• Imitation collections: thousands of derivative PFP projects with no distinction
• Promotional hype cycles: celebrity mints, influencer drops, coordinated floor pumps
• Royalty evasion: marketplaces (Blur, later OpenSea) made royalties optional, destroying creator economics

What survived or remained relevant:

• Blue-chip cultural moments: CryptoPunks, early generative art (Art Blocks Chromie Squiggles)
• Utility NFTs: ENS domains, gaming items, DAO memberships, event tickets
• Music NFTs: artists using NFTs for direct fan monetization
• Real-world asset tokenization: real estate, art, collectibles tokenized as NFTs

NFT Use Cases in 2026

Gaming

In-game items as NFTs give players true ownership that persists across game updates and potentially between games. Axie Infinity, Illuvium, Parallel, Shrapnel, and Pixels all use NFTs for game assets to varying degrees.

Event Tickets

Tickets as NFTs prevent scalping (non-transferable options), enable royalty-sharing on resales, and provide verifiable ownership. Ticketmaster and several major venues have experimented with this.

Identity and Credentials

Soulbound tokens (SBTs) and similar non-transferable NFT variants represent credentials, certifications, or reputation. Gitcoin Passport, Worldcoin, and many DID implementations rely on these.

Domain Names

Ethereum Name Service (ENS) domains are NFTs. Solana's Bonfida, Near's .near domains, and Unstoppable Domains across chains follow similar patterns. Domain ownership is NFT ownership.

Music Rights

Artists tokenize song rights or royalty streams. Royal, Sound.xyz, and Catalog support various monetization models for musicians.

Tokenized Real-World Assets

High-value physical assets (fine art, real estate fractions, rare collectibles) are tokenized as NFTs for liquid trading and fractional ownership.

Related Intelligence

• Smart Contracts: The code NFT contracts run on.
• Ethereum: The chain where NFTs originated and most cultural collections live.
• Solana: Alternative NFT ecosystem with lower costs and different trader dynamics.