What Are Bitcoin Ordinals? Bitcoin’s Native NFT Format

Bitcoin Has Its Own NFTs, and They Work Differently

Most NFT guides, including several on this blog, talk about Ethereum, Solana, Polygon, or Base. Those chains all run smart contracts, and a typical NFT is a token whose metadata points to an image stored elsewhere, often on IPFS. Bitcoin was never built for smart contracts, yet it has its own, very different way of hosting NFT style assets. They are called Ordinals, and understanding how they work helps explain why the wider NFT world is more varied than a single blockchain can show.

What an Ordinal Actually Is

Bitcoin’s smallest unit is the satoshi, worth one hundred millionth of a bitcoin. In January 2023, developer Casey Rodarmor released a protocol called Ordinal Theory, which assigns every satoshi a unique, permanent number based on the order it was mined and the order it moves between transactions. That numbering scheme is the “ordinal” in Ordinals.

Once a satoshi has a number, data can be attached to it. That attached data, an image, a short text file, even a small game, is called an inscription. The inscription is not a separate token layered on top of Bitcoin the way an ERC-721 token sits on Ethereum. It is content written directly into a Bitcoin transaction and permanently tied to one specific satoshi.

How the Data Gets Onto Bitcoin

Inscriptions became possible because of Taproot, a 2021 upgrade to Bitcoin, combined with the witness data structure introduced earlier by Segregated Witness (SegWit). Witness data holds signature information for a transaction, and Taproot made it practical to store much larger amounts of arbitrary data there without breaking how Bitcoin nodes validate transactions. An inscription writer puts the file’s content into this witness data, and the Bitcoin network replicates it to every full node, the same way it replicates account balances.

How This Differs From an Ethereum Style NFT

The distinction matters because it changes what you actually get when you own one:

• Storage: An Ethereum NFT’s token usually points to a file on IPFS or Arweave. An Ordinal’s file is the on-chain data itself, replicated by every Bitcoin node that stores the full blockchain.
• Structure: Ethereum NFTs rely on a smart contract that defines ownership rules, transfers, and often royalties, following standards like ERC-721 or ERC-1155. Bitcoin has no smart contract layer, so an Ordinal’s “ownership” is simply whoever controls the private key to the satoshi it is inscribed on.
• Royalties: Standards like EIP-2981 let Ethereum marketplaces calculate creator royalties automatically. Bitcoin has nothing equivalent built into the protocol, so royalty enforcement on Ordinals marketplaces is voluntary and typically much lower, often in the 0 to 2 percent range compared to the 5 to 10 percent common on Ethereum.
• Fungible tokens: The same inscription mechanism is used to create fungible tokens on Bitcoin, first through an experimental standard called BRC-20, and more recently through Runes, a format built more natively into Bitcoin’s transaction model. These are a separate use case from NFT style inscriptions, closer to Bitcoin’s version of a token launch than to digital art.

Wallets and Marketplaces

A regular Bitcoin wallet has no idea an inscription exists and can accidentally spend the exact satoshi it lives on, destroying the link between the data and that coin. Viewing or trading Ordinals safely requires wallet software built to recognize and protect inscribed satoshis, such as Xverse, Unisat, or Leather.

The marketplace side has shifted over time. Some larger, multi chain marketplaces experimented with listing Ordinals and later scaled that support back, which pushed collectors toward Bitcoin native platforms like Magic Eden’s earlier Ordinals support, UniSat, Gamma, and OrdinalsBot. If you are looking at an Ordinal on any platform, check whether that platform specializes in Bitcoin assets or is treating them as a side feature, since support and liquidity can change.

Practical Things to Know Before You Look Into Ordinals

• Fees swing with network congestion. Inscribing data onto Bitcoin pays the same miner fee market as any other Bitcoin transaction, so costs rise sharply when the network is busy.
• Full on-chain storage is a tradeoff. Replicating every inscription’s content to every node is what gives Ordinals their permanence, but it also adds to the long term size of the Bitcoin blockchain, which is a point of ongoing debate among Bitcoin developers.
• Liquidity is uneven. Many Ordinals collections trade thinly, so prices can move a lot on small volume. Treat valuations the same way you would treat any illiquid collectible.
• Use Ordinals aware tools only. Sending, receiving, or consolidating Bitcoin in a wallet that does not track inscriptions is the most common way people accidentally lose one.

Where This Fits Into the Bigger NFT Picture

Ordinals are a reminder that “NFT” describes a concept, a unique, verifiable digital asset, rather than one specific technology. Ethereum style smart contract NFTs remain the most common entry point for creators because of mature tooling, established standards, and broad marketplace support. Bitcoin Ordinals show that the same basic idea of unique, provably scarce digital ownership can be built on a chain that was never designed with NFTs in mind.

If you are creating and minting your own digital art, Simple NFT Creator helps you prepare, upload, and mint NFTs on established smart contract networks right from your phone. It is available on the App Store and Google Play.