π’ Ordinals Ordinals
A system that gives each individual satoshi β the smallest piece of Bitcoin β its own serial number, so one specific sat can carry an image or text and become a one-of-a-kind collectible directly on the Bitcoin blockchain.
π· The simple version β a serial number on a single coin
Think of ordinary Bitcoin like coins in a piggy bank. They're interchangeable, and nobody cares which exact coin they spend. Ordinals flips that. It numbers every satoshi (the smallest unit of Bitcoin, where 1 sat = 0.00000001 BTC) and then lets you paint a tiny picture onto one specific numbered sat. That single coin becomes a collectible, even though it's still real, spendable money.
π How the numbering works
The protocol numbers each satoshi in the exact order it was mined β an idea its creator calls "ordinal theory." As sats move through transactions, they're tracked in first-in, first-out order, so each sat keeps a stable identity you can follow over time. That trackable identity is what makes a single sat behave like a unique item.
βοΈ What an "inscription" is
Attaching content to a sat is called an inscription. The file β text, an image, even video β is written fully on-chain, inside the transaction's witness data, up to roughly 4 MB per transaction. Anyone with a compatible wallet and enough BTC to cover fees can create one. Once it's mined, it's permanent.
π¦ This is the headline difference from many Ethereum NFTs: there, the token often holds only a link to a file stored on an outside server or IPFS. With Ordinals the actual content lives on Bitcoin itself, so it doesn't depend on any external storage staying online.
π Why it's not "the same as an Ethereum NFT"
| Ordinals (Bitcoin) | Typical Ethereum NFT | |
|---|---|---|
| What the asset is | The satoshi itself + inscribed data | A token created by a smart contract |
| Token standard | None β no separate standard | Yes (e.g. ERC-721) |
| Smart contract | Not used | Required |
| Where the content lives | Fully on-chain on Bitcoin | Often a link to an external server / IPFS |
π± Who made it, and what it sparked
Ordinals was created by developer Casey Rodarmor and launched in January 2023. It became practical thanks to earlier Bitcoin upgrades β SegWit (2017) and Taproot (2021) β that expanded how much witness data a transaction can carry. The idea quickly spread into fungible-token experiments on Bitcoin: BRC-20 tokens (2023) and the Runes protocol (April 2024). By the end of 2024, more than 70 million inscriptions had been created.
π¨ Things beginners should know
- π« Not a smart-contract NFT β there's no token standard and no contract; the asset is the sat plus its data
- πΎ Storage is on-chain β the file sits on Bitcoin, not on an outside server that could disappear
- βοΈ It uses block space β heavy inscription activity has at times raised fees and slowed transactions, which divides the community
- π Collectible prices swing hard β like other digital collectibles, values can drop sharply, so never spend more than you can lose
β FAQ
- Are Ordinals just NFTs on Bitcoin?
- They behave like NFTs, but technically they work differently. There's no separate token standard and no smart contract β the asset is the satoshi itself plus the data inscribed onto it, and that data lives fully on Bitcoin rather than on an outside server.
- Where is the picture or text actually stored?
- Fully on the Bitcoin blockchain, inside the transaction's witness data, up to about 4 MB per transaction. This is different from many Ethereum NFTs, which often store only a link pointing to a file kept on an external server or IPFS.
- Do Ordinals affect normal Bitcoin users?
- They can. Inscriptions take up block space, and heavy activity has at times pushed transaction fees up and slowed things down. Some people see this as bloat; others say the extra fee demand rewards miners. It's a genuine, ongoing community debate.