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 and outputs : - Sats from flow to first, then overflow to . - Within , sats are ordered by their original numbers. Sat rarity classes Casey defined a fan-following hierarchy: - Common : any sat. - Uncommon : first sat of eac…