What Are Bitcoin Ordinals?
Bitcoin Ordinals (also called "inscriptions") are a way to attach digital content — images, text, code, video — directly to individual satoshis (the smallest unit of Bitcoin) on the Bitcoin blockchain. Introduced in January 2023 by developer Casey Rodarmor, Ordinals brought NFT-like functionality to Bitcoin for the first time without requiring a separate token or sidechain.
Unlike Ethereum NFTs which store only metadata on-chain and typically point to images hosted elsewhere (IPFS, centralized servers), Bitcoin Ordinals inscribe the actual data directly onto the Bitcoin blockchain itself. The content is fully on-chain, forever, as long as Bitcoin exists.
A Quick Bitcoin History: Satoshis and Ordinal Theory
To understand Ordinals, you need to know two things:
Satoshis (sats): 1 Bitcoin = 100,000,000 satoshis. The satoshi is Bitcoin’s smallest unit. Approximately 2.1 quadrillion satoshis will ever exist (100M × 21M BTC).
Ordinal Theory: Casey Rodarmor developed a numbering system that assigns a unique serial number to every satoshi, based on the order in which it was mined. Satoshi #0 is from the genesis block. Satoshi #1 comes right after. Every sat has a unique identity — making them "non-fungible" in theory.
An inscription is when data (the "content") is attached to a specific satoshi using Bitcoin’s Taproot upgrade (activated November 2021). The content is embedded in the witness data of a Bitcoin transaction.
How Bitcoin Ordinals Differ from Ethereum NFTs
| Feature | Ethereum NFT | Bitcoin Ordinal |
|---|---|---|
| Data storage | Metadata on-chain; image on IPFS/server | Full content inscribed directly on Bitcoin |
| On-chain permanence | Partial (image may disappear) | Complete — data lives on Bitcoin forever |
| Smart contracts | Yes — complex programmability | No — simpler, script-based |
| Fungibility model | Token (ERC-721) | Individual satoshi with inscription |
| Network security | Ethereum PoS | Bitcoin PoW (most secure chain) |
| Transaction costs | Variable gas fees | Bitcoin transaction fees |
| Ecosystem age | 2017–present | January 2023–present |
Types of Inscriptions
Ordinals support any file type that can be embedded in a Bitcoin transaction:
- Images: PNG, JPEG, WebP, SVG, GIF — most common
- Text: Plain text, JSON, HTML
- Code: JavaScript, HTML pages that run in the browser
- Video: Short MP4 clips (limited by block size)
- Audio: Short audio clips
Recursive inscriptions: A more advanced technique where one inscription references another, enabling complex generative art and interactive experiences built entirely on Bitcoin.
Notable Ordinals Collections
Ordinal Punks
One of the earliest Ordinals collections — inscribed in the first few hundred inscriptions. Ultra-rare due to their low inscription numbers.
Bitcoin Frogs
10,000 hand-drawn frog illustrations. The most traded Ordinals collection by volume in 2023.
Nodemonkes
10,000 hand-drawn monkey characters. Considered a blue-chip Ordinals collection.
Bitmap
A metaverse-like project where each Bitcoin block can be "claimed" as a Bitmap plot. Sparked the concept of "metaverse on Bitcoin."
Runestones
Part of the lead-up to the Runes protocol launch during Bitcoin’s 4th halving in April 2024.
Runes: What Comes After Ordinals?
In April 2024, Casey Rodarmor also launched Runes — a new protocol for fungible tokens on Bitcoin (similar to ERC-20 on Ethereum). Runes use UTXO-based accounting and are more efficient than the BRC-20 standard that preceded them.
Runes don’t replace Ordinals — they coexist. Ordinals = non-fungible (NFT-like). Runes = fungible tokens.
How to Buy Bitcoin Ordinals
Step 1: Get a Bitcoin Ordinals Wallet
- Xverse — most popular, user-friendly, supports Ordinals + Runes
- Leather (formerly Hiro Wallet) — open-source alternative
Step 2: Fund Your Wallet with BTC
Transfer Bitcoin to your wallet’s "Ordinals address" (this is different from your regular BTC payment address — don’t mix them up).
Step 3: Browse Marketplaces
- Magic Eden (BTC section) — largest volume
- Gamma.io — Ordinals-native marketplace
- Ordinals Market — ordinals.market
- OKX NFT — major exchange with Ordinals support
Step 4: Buy and Receive
When you purchase an Ordinal, the specific satoshi with the inscription transfers to your Ordinals wallet address. It appears in your wallet’s Ordinals gallery.
How to Inscribe (Create) an Ordinal
Creating an Ordinal inscription requires:
- A Bitcoin wallet with funds
- An inscription service or running your own Bitcoin node
Services like Gamma.io, Ordinalsbot, and Unisat allow you to upload your file and pay to have it inscribed. Costs vary based on file size and Bitcoin network fees.
The "On-Chain" Advantage
The most compelling argument for Bitcoin Ordinals is permanence. When you buy an Ethereum NFT, you typically own:
- An on-chain token pointing to a URL
- The URL might go offline, the image disappears
With a Bitcoin Ordinal, the inscription IS on the Bitcoin blockchain. As long as Bitcoin’s network exists — and there are trillions of dollars incentivizing it to keep running — your inscription exists.
Controversies and Debates
Ordinals sparked significant debate in the Bitcoin community:
Critics argue:
- Ordinals clog the Bitcoin blockchain with "non-financial" data
- They drive up transaction fees for regular BTC users
- Bitcoin should be money only, not an NFT platform
Supporters argue:
- Ordinals generate fees for Bitcoin miners (strengthening network security post-halving)
- Bitcoin is a censorship-resistant data layer — inscriptions are valid use
- More use cases = more demand for Bitcoin block space
The debate continues, but Ordinals are firmly established as a major part of the Bitcoin ecosystem.
Track upcoming Bitcoin Ordinals drops on the NFTRadius Calendar.