bitcoin-metaprotocols-ordinals
Ordinal theory: numbering scheme for individual satoshis (sat ordinals). ord client, sat-tracking, rare sat collecting, foundation for inscriptions / BRC-20 / sub-protocols. USE WHEN: working with ord client, tracking sats, building Ordinals apps.
What this skill does
# Ordinal Theory Casey Rodarmor's scheme (2022) for numbering individual satoshis. Each of Bitcoin's ~2.1 quadrillion sats has a unique number based on mining order, allowing them to be tracked through transactions. ## Numbering scheme Sats numbered 0, 1, 2, ... based on: - Mining order (block + position). - First-in-first-out (FIFO) through inputs/outputs. When a tx has inputs `[A1, A2]` and outputs `[B1, B2]`: - Sats from `A1` flow to `B1` first, then overflow to `B2`. - Within `A1`, sats are ordered by their original numbers. ## Sat rarity classes Casey defined a fan-following hierarchy: - **Common**: any sat. - **Uncommon**: first sat of each block. - **Rare**: first sat of each difficulty epoch (every 2016 blocks). - **Epic**: first sat of each halving (every 210k blocks). - **Legendary**: first sat of each cycle (every 6 halvings, ~24 years). - **Mythic**: sat #0 (the first sat ever; in Satoshi's coinbase). Some collectors pay premium for rare sats. ## ord client Reference implementation: - `github.com/ordinals/ord` (Rust). - Indexes the entire chain to compute sat ordinals. - Provides: - Wallet for sending specific sats (avoid spending rare ones). - Inscription creation/viewing. - REST API for querying. Heavy index: full ord index ~1+ TB on a recent chain. ## Indexed services - **ordinals.com** — primary explorer. - **mempool.space** integration for ordinal viewing. - **OrdiScan, Ordinalsbot** — third-party services. ## Use cases - **Sat collecting** — buying / selling rare sats. - **Foundation** for inscriptions, BRC-20, Runes, etc. - **Provenance tracking** — proving a sat originated from a specific block. ## Compared to UTXO Ordinals are an **interpretation** layer; Bitcoin consensus has **no notion of ordinal numbering**. The ord client computes ordinals by parsing the chain. Different ord clients **must** agree on the numbering scheme. ## Common confusions - "Ordinals" = sat numbering. **Inscriptions** = data attached to sats. They're different concepts often conflated. - ord client requires **txindex** + ord-specific indexing. - "Mythic sat" is just one specific sat (sat #0); not a category of thousands. ## See also - [inscriptions/SKILL.md](../inscriptions/SKILL.md) - [brc-20/SKILL.md](../brc-20/SKILL.md) - [runes/SKILL.md](../runes/SKILL.md) - [atomicals/SKILL.md](../atomicals/SKILL.md)
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