Ordinals

Ordinals is a numbering scheme, introduced by Casey Rodarmor in January 2023, that assigns every satoshi a unique serial number based on the order it was mined. Because the supply schedule creates roughly 2.1 quadrillion satoshis, each one receives an ordinal number from 0 upward. That number follows the sat as it moves between wallets, so long as observers track inputs and outputs using a first-in-first-out rule. Critically, ordinal theory requires no change to Bitcoin consensus; it is an interpretation layered on top of the existing UTXO model, visible only to software that chooses to track it. Nodes that ignore ordinals see the same chain, the same balances, the same rules.

How sats get their numbers

Each satoshi is created in a specific block by that block's coinbase transaction, so mining order gives every sat a deterministic identity: the first sat of the genesis block is ordinal 0, and numbering proceeds through every subsidy ever paid. When transactions spend and create outputs, the convention assigns sats to outputs first-in-first-out, so a sat's location remains computable from the public chain alone. Wallets that support ordinal theory can locate a particular sat, label it — the scheme defines rarity tiers tied to protocol events, such as the first sat of a block or of a halving epoch — and move it deliberately using careful coin selection. This is what makes it possible to treat individual sats as collectible and to anchor data to a specific one.

What it changed for miners

Whatever one thinks of digital artifacts, ordinals had a measurable effect on mining economics: inscription activity has repeatedly filled blocks and bid up fee rates, at times pushing fee revenue to an unusually large share of the block reward. For miners, that is demand for block space from a new customer class. It also created a niche where the coinbase itself matters: rare sats are born in coinbase outputs, so miners are uniquely positioned first owners of them. Understanding ordinal-driven demand helps any operator reason about mempool congestion waves and fee-rate spikes that would otherwise look random.

The block-space debate

Ordinals reignited a long-running argument about what belongs on the base chain. Supporters see permissionless use of purchased block space as a direct expression of Bitcoin's neutrality: if you pay the fee, the network does not judge the payload. Critics point to fee-market pressure on ordinary monetary transactions, chain growth, and mission drift. D-Central takes a neutral, technical view: ordinal theory is a real, consistent property of how Bitcoin already works, the fees are real revenue securing the network, and operators are better served by understanding the phenomenon than by wishing it away. Censoring fee-paying transactions is not a precedent miners should want, whatever their aesthetic preferences.

Wallet hygiene if you hold them — or don't

Ordinal theory has one practical consequence even for people who ignore it: sats are no longer interchangeable to everyone. If you deliberately hold inscribed or rare sats, keep them in a dedicated ordinals-aware wallet, because ordinary wallets select coins by value alone and will cheerfully spend a collectible sat as miner fees or merge it into change. Coin control is the tool either way — segregating UTXOs you care about from spending funds prevents accidents in both directions. If you don't participate at all, no action is required: your node, your wallet, and your balances behave exactly as before, which is itself the point worth appreciating. An entire collectibles economy operates on top of Bitcoin without requiring a single node that doesn't care to change anything.

Ordinals is the foundation for Inscriptions, which attach arbitrary data to individual sats, and the BRC-20 token convention built on top of them. For the protocol's authoritative description, see the ordinal theory handbook maintained by its author.