What Are NFTs? What Are Non-Fungible Tokens Used For?

An NFT (Non-Fungible Token) is a blockchain-based digital asset certificate. Each NFT is unique and non-interchangeable. Unlike fungible tokens such as Bitcoin or Ether — where every unit is identical and interchangeable — an NFT represents proof of unique ownership over a specific digital or physical asset.

1. How NFTs Work

1.1 Fungible vs. Non-Fungible

The key to understanding NFTs lies in distinguishing between "fungible" and "non-fungible":

• Fungible Token: Every unit is identical and interchangeable. 1 BTC equals any other 1 BTC; one $100 bill equals any other $100 bill.
• Non-Fungible Token: Every unit is unique and non-interchangeable — analogous to how every original painting or concert ticket in the real world is one-of-a-kind.

1.2 Technical Standards

NFTs are primarily based on the following Ethereum token standards:

Other blockchains have their own NFT standards, such as Solana's Metaplex standard and Bitcoin Ordinals.

1.3 Metadata and Storage

An NFT consists of two core components:

• On-chain data: Token ID, owner address, creator address, and other information recorded on the blockchain.
• Metadata: Data describing the NFT's properties (such as image URL, name, description, and trait attributes), typically pointing to a JSON file via a tokenURI.

How metadata is stored directly affects an NFT's longevity:

• On-chain storage: Fully stored on the blockchain; most secure but most expensive.
• IPFS/Arweave: Decentralized storage; moderate cost with reasonable durability.
• Centralized server: Lowest cost, but if the server goes offline, the NFT's content may be lost.

2. Minting and Trading NFTs

2.1 Minting

Minting is the process of creating an NFT. A creator calls a smart contract's mint function to associate digital content with a new token ID and record it on the blockchain. The minting process requires paying a Gas fee.

2.2 Marketplaces

NFT marketplaces are the primary platforms for buying and selling NFTs:

• OpenSea: The largest general NFT marketplace, supporting Ethereum, Polygon, Solana, and other chains.
• Blur: An NFT marketplace for professional traders, featuring batch trading and advanced analytics.
• Magic Eden: Initially focused on Solana, now expanded to multiple chains.
• LooksRare/X2Y2: Competing NFT marketplaces on Ethereum.

2.3 Royalty Mechanism

One of the major innovations of NFTs is creator royalties. Creators can set a percentage (typically 2.5%-10%) to receive on every secondary market transaction. However, enforcing royalties has been a persistent industry debate; some marketplaces (such as Blur) allow buyers to choose whether to pay royalties.

3. Major NFT Use Cases

3.1 Digital Art

NFTs provide digital artists with scarcity and proof of ownership, allowing digital works to be collected and traded like physical art. Notable examples include:

• Beeple's Everydays: The First 5000 Days sold at Christie's for $69.3 million.
• Platforms like Art Blocks have driven the rise of generative art.

3.2 PFP and Community

PFP (Profile Picture) NFTs are among the most popular types. Holders use them as social media avatars, forming unique community cultures:

• CryptoPunks: 10,000 pixel-style avatars considered the "blue-chip" of NFT projects.
• Bored Ape Yacht Club (BAYC): Holders enjoy unique community benefits and commercial usage rights.
• Azuki: A PFP project blending Japanese anime aesthetics.

3.3 Gaming and Virtual Worlds

NFTs in games represent characters, equipment, land, and other virtual assets, giving players true ownership of in-game items:

• Axie Infinity: The iconic Play-to-Earn game where players earn tokens through battles.
• Decentraland/The Sandbox: Virtual world land parcels traded as NFTs.

3.4 Music and Content

Musicians use NFTs to sell music and exclusive content directly to fans, bypassing traditional record labels and streaming platforms:

• Sound.xyz: A music NFT platform connecting artists directly with collectors.
• Royal: Allows fans to own a share of music royalties through NFTs.

3.5 Identity and Credentials

NFTs can serve as non-transferable identity credentials (such as academic certificates, memberships, and proof-of-attendance). The Soulbound Token (SBT) concept, proposed by Vitalik Buterin and others, is designed specifically for non-transferable identity credential scenarios.

3.6 Domain Name Services

Blockchain domain name systems (such as ENS and Unstoppable Domains) issue domain names as NFTs, allowing users to map complex wallet addresses to easy-to-read domains (such as alice.eth).

4. NFT Valuation and Risks

4.1 Valuation Factors

NFT value is typically assessed based on the following factors:

• Scarcity: Total supply and trait rarity.
• Community: Community activity level and cultural influence.
• Creator: The creator's reputation and track record.
• Utility: Whether it comes with community benefits, commercial licensing, or in-game functionality.
• Historical trading: Floor price trends and trading volume.

4.2 Key Risks

5. Technical Evolution of NFTs

5.1 Bitcoin Ordinals

In early 2023, Casey Rodarmor introduced the Ordinals protocol, which allows data to be inscribed onto the smallest unit of Bitcoin (a Satoshi), enabling the Bitcoin network to host NFTs. This innovation sparked widespread debate about the purpose of the Bitcoin network.

5.2 Dynamic NFTs

Dynamic NFTs have metadata that can update based on on-chain or off-chain conditions. For example, a sports NFT can update its attribute data based on an athlete's real-world performance.

5.3 Composable NFTs

The ERC-6551 standard allows each NFT to have its own smart contract account, enabling NFTs to hold other tokens and NFTs — creating an "NFTs within NFTs" nested structure.

5.4 NFT Financialization

• NFT fractionalization: Splitting high-value NFTs into multiple fungible token shares to lower the investment threshold.
• NFT lending: Using NFTs as collateral to borrow crypto assets (e.g., BendDAO, NFTfi).
• NFT rentals: Renting out the usage rights to an NFT without transferring ownership.

6. NFT Market Development Trends

1. Utility first: The market is shifting from speculation-driven to utility-driven; NFTs with real use cases are gaining more attention.
2. Brand adoption: Traditional brands like Nike, Adidas, and Starbucks are using NFTs to build Web3 loyalty programs and digital experiences.
3. Regulatory clarity: Governments are beginning to bring NFTs within regulatory frameworks, clarifying their legal classification and tax obligations.
4. Infrastructure maturation: Tools for minting, analytics, and curation are becoming more sophisticated.
5. Cross-chain interoperability: Transferring and trading NFTs across different blockchains is becoming easier.

Summary

NFTs use blockchain technology to give digital content scarcity, verifiable ownership, and tradability. From digital art to game assets, from identity credentials to brand marketing, NFTs are reshaping how ownership and distribution of digital content work. Although the market is still early-stage and highly volatile, NFTs' long-term value as foundational digital ownership infrastructure is worth watching.

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