# Rare Sats

The concept of "rare sats" (satoshis) within the Bitcoin ecosystem refers to individual satoshis that possess unique characteristics or historical significance, making them more valuable or sought after compared to ordinary satoshis. This notion has gained popularity with the advent of the Bitcoin Ordinals protocol, which allows for the identification and inscription of individual satoshis. Rare sats are often distinguished by their association with famous Bitcoin transactions, blocks, or notable events in the cryptocurrency's history.\ <br>

According to [Ordinal Theory,](https://rodarmor.com/blog/ordinal-theory/) the following types of rare sats exist:&#x20;

* `uncommon satoshi`: the first satoshi in each coinbase
* `rare satoshi:` the first satoshi in the coinbase of the block created right after difficulty adjustment
* `epic satoshi`: the first satoshi in the coinbase of the block created right after halving
* `legendary satoshi`: the first satoshi in the coinbase of the block created right after a halving that coincides with a difficulty adjustment event
* `mythical`: the first satoshi in existence, locked forever in the first block, and unspendable. Meant only to be glanced at, never to be collected

***

Aside from the Ordinal Theory rarity, people have been collecting other interesting satoshis: interesting by virtue of their historical value, aesthetics of their ID, or their involvement in special transactions marking an important event for Bitcoin.

Some examples include:

* `Block 9`: Satoshis involved in the first transaction (historical value);
* `Block 9 450x`: Satoshis taken from the first bitcoin of the 9th block. All sats between 45,000,000,000 and 45,099,999,999 (including)
* `Palindrome`: Satoshis which have a palindromic ID (aesthetic value);
* `Pizza`: Satoshis involved in the famous pizza transaction (value given by their involvement in historical events);


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