In addition to the community based labels, "rare sats" represent unique satoshis within the vast Bitcoin ecosystem, differentiated by their distinct attributes and the timing of their creation. The Rodarmor Rarity Index is a classification system conceived by Casey Rodarmor and rooted in Ordinal Theory — these satoshis are categorized based on pivotal moments in Bitcoin's timeline, such as mining difficulty adjustments and halving events.

Key labels:

Uncommon This label is designated to the first satoshi of every block. Given that a new block is added to the Bitcoin blockchain approximately every 10 minutes, these sats capture the very beginning of that timeframe.

Rare The Bitcoin network periodically adjusts its mining difficulty to ensure that blocks are added roughly every ten minutes. The first sat of each such adjustment period is branded as "Rare." This reflects the ever-evolving nature of the network's security and consensus mechanisms.

Epic Every four years, the Bitcoin network experiences a "halving" event where the mining reward is cut in half. The first sat of each of these halving epochs is labeled "Epic," marking a significant moment in Bitcoin's economic model.

Black Sats Within the Bitcoin ecosystem, 'Black Sats' have emerged as a unique classification system, highlighting specific satoshis that mark significant end-points in the blockchain's progression. These sats capture pivotal moments, offering a contrast to the initial sats traditionally emphasized.