Bitcoin Ordinals: How NFTs Work on the Bitcoin Network
Bitcoin Ordinals Explained: NFTs on Bitcoin Network
Bitcoin was built for payments, yet collectors now trade art and tokens on it. Bitcoin-Ordinals made that shift possible in January 2023.
The system lets users attach content to one satoshi, which is why many call the results Bitcoin NFTs. Readers following the market can also check today's Bitcoin news.
Bitcoin Ordinals is a method for numbering satoshis, the smallest units of bitcoin, plus inscriptions that attach content to them through ordinary transactions. It needs no sidechain and no separate token.
What Are Bitcoin Ordinals?
Developer Casey Rodarmor launched the protocol in January 2023. Ordinal theory gives each Satoshi a serial number based on mining order.
Bitcoin Ordinals track those numbers through transfers using a first-in, first-out rule across transaction inputs and outputs.
Inscriptions then attach content to a chosen satoshi. Because Bitcoin-Ordinals keep inscription-content on the blockchain itself, the file does not depend on an outside server, unlike many NFTs.
How Do Inscriptions Work?
Inscriptions rely on Taproot, activated in November 2021. The process uses two transactions:
Commit: a transaction sends funds to a Taproot output that commits to a script holding the content.
Reveal: spending that output publishes the content in script-path witness data.
The inscription documentation describes this flow. Bitcoin block size limits how large a file can be, so smaller files cost less.
Anyone creating Bitcoin Ordinals should expect fees to rise when the network is busy. Readers converting fees into dollars can check the current Bitcoin price prediction.
Inscription ID vs Inscription Number
These two terms are often confused.
Inscription ID: the reveal transaction ID plus an index, which points to one specific-inscription.
Inscription number: a running count assigned by indexer rules, which can differ between tools.
The ID is the safer identifier when verifying a purchase.
What Are Rare Satoshis?
Ordinal theory also labels satoshis by rarity, such as the first satoshi of a block or of a difficulty adjustment period. Bitcoin itself treats every satoshi as equal.
Rarity is a collector idea, and Bitcoin-Ordinals give that idea a technical basis.
Bitcoin Ordinals vs Ethereum NFTs
Feature | Bitcoin-Ordinals | Ethereum NFTs |
Data storage | Inscription content on-chain | Varies from fully on-chain to linked off-chain |
Standard | Inscriptions, no contract | ERC-721 and ERC-1155 |
Programmability | Limited | High through smart contracts |
Main cost driver | Bitcoin fees and file size | Gas and minting contract |
Bitcoin-Ordinals favor durable storage, while Ethereum favors richer logic. Anyone curious about contract limits on Bitcoin can read this guide to Bitcoin smart contracts.
BRC-20 and Runes: How They Differ
BRC-20 documentation, created by the pseudonymous developer domo in March 2023, records token actions as text inscriptions. Indexers calculate balances, not Bitcoin itself.
Runes arrived at the April 2024 halving. It uses Bitcoin's UTXO model and does not rely on inscriptions.
In short, Bitcoin Ordinals are the base idea, BRC-20 builds on inscriptions, and Runes is a separate fungible token system.
Where Are Ordinals Traded and Stored?
Marketplaces and wallets support Bitcoin Ordinals, and most rely on indexers to map each satoshi to its inscription. Features, fees, and supported assets change often, so each platform should be checked directly.
A good wallet offers sat control, meaning it keeps inscribed satoshis apart from spendable funds. Beginners who only want plain BTC can start with Bitcoin spot trading basics instead.
Security and Risk Checks
Wallet mistakes: a wallet without inscription support may spend an inscribed satoshi as change. Holders of Bitcoin Ordinals should use sat control and send a small test transfer first.
Fake collections: lookalike Bitcoin-Ordinals collections exist. Compare the full inscription ID and collection provenance and reveal the transaction on a block explorer. The Bitcoin scams guide lists common warning signs.
Indexer reliance: BRC-20 balances depend on indexers, and tools can disagree during disputes.
Fee spikes: busy periods can make small trades uneconomical.
Thin markets: exits can be slow or costly, and these are market risks, not technical ones.
Policy changes: Bitcoin Core v30, released in October 2025, changed default OP_RETURN relay limits. That concerns default relay policy, not the inscription protocol. Later releases exist, so check the official release notes.
Method limit: this guide reflects documentation reading, not hands-on testing, and is not financial or technical advice.
Final Thoughts
Bitcoin Ordinals turned a payment network into a place for collectibles and experimental tokens. Each satoshi gets a number, and an inscription attaches content to it through a commit and reveal pair.
Anyone considering Bitcoin-Ordinals should read the official handbook, pick a wallet with sat control, and verify the inscription ID before paying.
Disclaimer: This article is general educational information about Bitcoin-Ordinals, inscriptions, BRC-20, and Runes. It is not financial, investment, technical, legal, or tax advice. Digital assets are volatile, and transactions on the Bitcoin network are irreversible.
