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On Bitcoin, “NFT” almost always means an Ordinals inscription: arbitrary content attached to one individual satoshi, the smallest unit of bitcoin, which is then followed through transactions by a numbering scheme called ordinal theory. An inscription is not a separate token and does not require a sidechain. The label is convenient, but the mechanics are different from many other NFT systems, so the definition is worth getting right before you buy, make, or transfer one.
Two separate ideas: ordinal theory and inscriptions
The term combines two concepts that people often blur together. Keeping them apart makes everything else easier to follow.
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Ordinal theory is the numbering and tracking scheme
The Ordinal Theory Handbook describes ordinal theory as assigning individual identities to satoshis so they can be tracked, transferred, and given meaning (docs.ordinals.com). The Ordinals BIP describes how this works at the protocol-description level. Sats are serially numbered from zero in the order they are mined. When a transaction spends sats, ordinal numbers are assigned to its outputs in the order of its inputs and outputs, a first-in-first-out rule (Ordinals BIP).
Ordinal theory is therefore a bookkeeping layer on top of ordinary Bitcoin transactions. The BIP states that it requires no changes to blocks, transactions, or network protocols.
Inscriptions are the content-bearing artifacts
An inscription inscribes individual sats with arbitrary content, producing what the ord documentation calls Bitcoin-native digital artifacts, “more commonly known as NFTs” (Inscriptions documentation). Each inscription carries a MIME content type, such as an image or text type, and a byte string holding the data itself. The content is written on-chain as part of a Taproot script-path spend.
Why the project says “digital artifact”
The Ordinals FAQ states: “An inscription is an NFT, but the term ‘digital artifact’ is used instead, because it’s simple, suggestive, and familiar” (Ordinals FAQ). That is the project’s own choice of vocabulary. It is not an independent industry standard, and the sentence is not attributed to a named author.
How an inscription is created
Creating an inscription uses a two-phase commit and reveal process. The ord documentation describes it this way (Inscriptions documentation):
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| Phase | What the transaction does | Why it matters |
|---|---|---|
| Commit | Creates a Taproot output that commits to a script containing the inscription content. | Fixes the content in a output before it is revealed. |
| Reveal | Spends the commit output and exposes the content on-chain. | The content is encoded in data pushes inside an unexecuted conditional envelope, so the envelope does not change how the script behaves. |
Where the inscription lands
If the inscription has no pointer field, the documentation says it is placed on the first sat of the reveal transaction’s input. From that point, the sat is tracked by ordinal theory like any other sat. It can be transferred, bought, sold, lost to fees, or recovered, depending on how later transactions handle it.
How ownership moves between transactions
Inscribed sats move as sats. Nothing in the protocol moves a special “token” object. A transaction keeps an inscription intact only if it places the intended sat in the intended output. That depends on the ordering of inputs and outputs and on the values assigned to each one (Inscriptions documentation).
In practice this means a transaction that ignores sat positions can send an inscribed sat to the miner as a fee. That is why the official wallet guide treats sat control as the core operational requirement rather than a convenience. Any wallet that does not expose sat control is unsuitable for moving inscriptions safely.
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What an NFT on Bitcoin is not
It is not a separate token or sidechain
The Ordinal Theory Handbook says the approach requires no sidechain or token other than Bitcoin (docs.ordinals.com). An inscription is content attached to a sat, and the sat is part of the Bitcoin ledger.
It is not BRC-20
BRC-20 is a separate, fungible-token convention built on JSON inscriptions. It is not the arbitrary-content artifact described here, and this article does not cover its rules. Do not treat the two terms as interchangeable.
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It is not a statement about all NFTs
The Ordinals FAQ contrasts inscriptions with NFT systems that point to off-chain media. That comparison is written by the project and describes its own design. The specific, checkable claim is narrower: according to the Ordinals inscriptions documentation, inscription content is stored on-chain in Taproot script-path data. Other NFT systems should be assessed on their own terms.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What you need to create or move an inscription
According to the ord wallet guide, checked in 2026, use requires a Bitcoin full node and a wallet that can create inscriptions and perform sat control when constructing transactions (Wallet guide). The documented setup has three parts:
- A full node: Bitcoin Core provides both the node and a wallet.
- Bitcoin Core 28 or newer: the guide specifies this version for inscription creation in its documented workflow. Check the guide for the current requirement before you install anything.
- The ord utility: it supplies the ordinal-aware commands that work with a Bitcoin Core wallet.
Bitcoin Core’s wallet cannot create inscriptions or perform sat control on its own. The ord utility is required for that work.
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The wallet guide puts the blockchain at about 600GB of disk space and notes that an external drive can hold block data. This is an approximate setup figure from the project’s guide, not a fixed network requirement. Chain growth and your choice of storage can change it.
Limits and claims to attribute carefully
- Royalties: The Ordinals FAQ says inscriptions do not support on-chain royalties (Ordinals FAQ). Do not promise creators ongoing payments on secondary sales.
- Permanence and decentralisation: Descriptions such as durable, immutable, secure, and decentralised come from the project’s own documentation. Present them as its claims.
- Costs: The FAQ includes an older cost estimate based on a stated bitcoin price and fee assumptions. Those inputs change constantly, and the page does not give a current quote, so do not treat that estimate as today’s price. Check current fees before minting or moving an inscription.
- Market size: The official documentation does not provide a reliable, current figure for how many inscriptions exist or what they sell for. Treat any unattributed marketplace number with caution.
The short version: a Bitcoin NFT is content tied to a specific satoshi and tracked by ordinal theory across ordinary Bitcoin transactions. It needs an ordinal-aware toolchain, and it carries no royalty mechanism.
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