What do Uncommon, Rare, and Epic Sats mean?

You might be familiar with the term “Uncommon sat.” What exactly is it and why does it hold significance in the realm of Ordinals?

— COMMON SATOSHI : refers to regular satoshis within a Bitcoin block that are not the initial satoshi. These “common” sats encompass the vast majority, exceeding 99%, of all satoshis in circulation.

— UNCOMMON SATOSHI : it denotes the first satoshi within a newly mined block. Considering that a fresh block is mined approximately every 10 minutes and will continue to be produced indefinitely, this initial satoshi in each block is classified as "uncommon."

— RARE SATOSHI : signifies the initial satoshi within each difficulty adjustment period. Bitcoin undergoes a "difficulty adjustment" roughly every 2,016 blocks, which translates to approximately a two-week interval. Therefore, the first satoshi of each of these adjustment periods is categorized as "rare."

— EPIC SATOSHI : epic refers to the initial satoshi within each halving epoch. Bitcoin experiences a "Halving event" approximately every 210,000 blocks, which occurs roughly every four years. As a result, the first satoshi of these halving epoch is qualified "epic."

— LEGENDARY SATOSHI : "Legendary" refers to the initial satoshi within each "cycle" in the context of Bitcoin's halving and difficulty adjustment synchronization. As described by Casey Rodarmor, every six halving events align with the difficulty adjustment, creating a conjunction. This special alignment, termed a "conjunction," occurs approximately every 24 years. The first satoshi within each of these conjunctions, marking the beginning of a cycle, is classified as "legendary." The inaugural conjunction is anticipated to occur sometime around 2032.

— MYTHIC SATOSHI : refers to the initial satoshi of the genesis block, which represents the very first satoshi ever created in the Bitcoin network. This satoshi is considered unspendable and unattainable because Satoshi Nakamoto intentionally rendered the first block unspendable.