Bitcoin Ordinals and Runes Explained: NFTs and Fungible Tokens on Bitcoin

For most of its history, Bitcoin was considered too simple for anything beyond sending and receiving BTC. While Ethereum built an entire ecosystem of NFTs, tokens, and DeFi, Bitcoin maximalists proudly insisted that Bitcoin should do one thing — be sound money — and do it well.

Then Casey Rodarmor launched Ordinals in January 2023, and the Bitcoin ecosystem was never the same. Suddenly, you could inscribe images, text, and even entire applications directly onto the Bitcoin blockchain. A year later, Rodarmor followed up with Runes — a protocol for creating fungible tokens on Bitcoin.

Together, Ordinals and Runes have created an entirely new layer of activity on the Bitcoin network, generating hundreds of millions in transaction fees and sparking fierce debate within the Bitcoin community.

What Are Bitcoin Ordinals?

The Ordinal Theory

Every Bitcoin is divisible into 100 million units called satoshis (sats). Ordinal Theory assigns a unique number to each individual satoshi based on the order in which it was mined. The first satoshi ever mined is ordinal number 0, the second is 1, and so on.

This numbering system allows each satoshi to be individually identified and tracked — turning fungible sats into uniquely identifiable units. Think of it like serial numbers on dollar bills.

Inscriptions

Once you can identify individual satoshis, you can attach data to them. This process is called inscription. When you inscribe a satoshi, you embed data — an image, text, HTML, audio, or even a small application — directly into a Bitcoin transaction.

This data lives on the Bitcoin blockchain permanently. Unlike NFTs on Ethereum, which typically store their images on IPFS or centralized servers, Ordinals inscriptions store everything onchain. The image IS on Bitcoin, not a pointer to an image stored somewhere else.

How Inscriptions Work Technically

Inscriptions leverage two Bitcoin upgrades:

1. SegWit (2017): Separated transaction signatures into a "witness" data section, creating space for additional data
2. Taproot (2021): Expanded the types of scripts that could be stored in witness data and removed most size limits on that data

The combination means you can embed up to 4 MB of data in a single Bitcoin block through the witness data section. Inscriptions use this space to store their content.

Notable Ordinals Collections

• Ordinal Punks: One of the first collections, inspired by CryptoPunks, with sub-10k inscription numbers
• Bitcoin Puppets: A collection that rallied the community around Bitcoin-native digital art
• NodeMonkes: A 10,000-piece PFP collection that became the blue-chip of Bitcoin NFTs
• Quantum Cats: Created by Taproot Wizards, exploring the intersection of art and Bitcoin culture

What Are BRC-20 Tokens?

Before Runes, the community created BRC-20 — an experimental token standard that used Ordinals inscriptions to create fungible tokens on Bitcoin.

BRC-20 works by inscribing JSON data onto satoshis to deploy, mint, and transfer tokens. The most notable BRC-20 token was ORDI, which launched in March 2023 and reached a market cap of over $1 billion.

However, BRC-20 had significant technical problems:

• UTXO bloat: Every operation created new unspent transaction outputs, bloating Bitcoin's UTXO set
• Inefficiency: Simple transfers required multiple inscriptions, wasting block space
• Complexity: The JSON-based approach was clunky and not native to how Bitcoin works

These problems led Casey Rodarmor to create a better solution.

What Are Runes?

Runes is a fungible token protocol for Bitcoin, launched at the Bitcoin halving in April 2024. It was designed from the ground up to be efficient and native to Bitcoin's architecture.

How Runes Work

Runes are built on Bitcoin's UTXO model (Unspent Transaction Output). Instead of inscribing JSON data, Runes uses OP_RETURN outputs to store token protocol messages. Each Rune operation is encoded as a compact data message that specifies:

• Etching: Creating a new Rune (defining name, symbol, supply, divisibility)
• Minting: Claiming newly created Rune tokens
• Transferring: Sending Runes between addresses

Because Runes work with UTXOs directly, they are far more efficient than BRC-20. There is no UTXO bloat, and transfers happen in a single transaction.

Runes vs BRC-20

Notable Runes

• DOG•GO•TO•THE•MOON: The largest Rune by market cap, airdropped to Bitcoin Puppets holders
• RSIC•GENESIS•RUNE: One of the first high-profile Rune launches
• Various meme Runes: A vibrant ecosystem of community-created tokens

How to Get Started with Ordinals and Runes

Wallets That Support Ordinals and Runes

You need a Bitcoin wallet that understands Ordinals — not every wallet does. The major options:

• Xverse: Full-featured wallet supporting Ordinals, BRC-20, and Runes with a clean interface
• Unisat: The original Ordinals wallet, with built-in marketplace functionality
• Leather (formerly Hiro): Supports Ordinals and integrates with the Stacks ecosystem
• Magic Eden Wallet: From the NFT marketplace, with native Ordinals support

How to Buy Ordinals

1. Set up a compatible wallet (Xverse or Unisat recommended)
2. Fund it with Bitcoin sent to your Ordinals-compatible address
3. Browse marketplaces: Magic Eden and Unisat are the two largest
4. Purchase: Buy a listed inscription or place a bid

How to Mint Runes

1. Connect a compatible wallet to a Rune launchpad
2. Check open mints: Some Runes have open minting periods where anyone can claim tokens
3. Pay the Bitcoin transaction fee to mint your allocation
4. Manage in your wallet: Your Runes balance appears alongside your BTC

The Controversy

Ordinals and Runes have divided the Bitcoin community like few other developments.

The Case For

• Fee revenue: Inscriptions and Runes generate significant transaction fees for miners, improving Bitcoin's long-term security budget as block rewards decrease with each halving
• Developer activity: Bitcoin's developer ecosystem has expanded dramatically, attracting talent that previously only built on Ethereum and Solana
• Cultural relevance: Ordinals brought a new generation of users to Bitcoin who might never have been interested in "digital gold" alone
• Everything onchain: Unlike Ethereum NFTs, Ordinals inscriptions store data directly on Bitcoin — the most decentralized and secure blockchain

The Case Against

• Block space competition: Inscriptions compete with regular Bitcoin transactions for block space, potentially driving up fees for people trying to simply send BTC
• Not what Satoshi intended: Purists argue that Bitcoin was designed for peer-to-peer electronic cash, not JPEGs and meme tokens
• Spam concerns: Some view inscriptions as spam that degrades Bitcoin's primary function
• Environmental concerns: Larger blocks with inscription data require more storage and bandwidth for node operators

What Is the State of Bitcoin NFTs in 2026?

The Ordinals ecosystem has matured significantly since its 2023 launch. The initial mania — where people were inscribing everything from pixel art to full-length novels — has settled into a more sustainable market.

Key trends in 2026:

• Curated collections have established floor prices and active communities
• Recursive inscriptions allow inscriptions to reference and build upon other inscriptions, enabling more complex onchain applications
• Metaprotocols like CBRC and Bitmap are building additional layers of functionality on top of Ordinals
• Runes have largely replaced BRC-20 as the preferred fungible token standard on Bitcoin
• Integration with Lightning: Early experiments are connecting Ordinals with the Lightning Network for faster trading

Should You Care About Ordinals and Runes?

If you are a Bitcoin holder, Ordinals and Runes represent a fundamental expansion of what Bitcoin can do. Whether you think that expansion is positive or negative, understanding it is important because it directly affects transaction fees, block space, and the cultural direction of the Bitcoin ecosystem.

If you are an NFT collector or token trader, Bitcoin offers something unique: the security and decentralization of the most battle-tested blockchain in existence. The trade-off is less programmability and slower iteration compared to Ethereum or Solana.

The Bitcoin maximalist dream of a chain that does nothing but transfer value may already be over. Ordinals and Runes have proven that demand exists for a richer Bitcoin, and that genie is not going back in the bottle.