> For the complete documentation index, see [llms.txt](https://natcats.gitbook.io/natcats/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://natcats.gitbook.io/natcats/natcats.md).

# Natcats

## About

Natcats is the first digital art collection generated by the Bitcoin blockchain. Each Natcat is a collectible cat produced from Bitcoin block data. New cats have the potential to be introduced autonomously by Bitcoin over the next 100+ years.<br>

## Deployment

Natcats is deployed to Bitcoin Ordinals using **Digital Matter Theory (DMT)** and **TAP Protocol**, and pioneered the DMT Unique Non-Arbitrary Token (UNAT) standard on its introduction. The first 8064 cats were offered as a free mint to the Ordinals community in February 2024.<br>

## Supply

Natcats are generated only when certain properties occur within Bitcoin blocks. These properties are rare and have occurred only 8064 times across the 870,000+ blocks mined to date.


#### **Supply Properties**

A Natcat is generated for a block when the block contains the pattern “3b” in its Bits field. Bits represents mining difficulty and adjusts every 2016 blocks.

| Block  | Bits (hex)   | Natcat |
| ------ | ------------ | ------ |
| 124991 | `0x1a6a93b3` | Yes    |
| 124992 | `0x1a44b9f2` | No     |

#### Supply History

The 8064 cats in the collection today were generated from blocks across four distinct ranges in Bitcoin’s history, each referred to as a distinct Natcats "generation".

| Generation | Bitcoin Blocks    | Year Mined |
| ---------- | ----------------- | ---------- |
| 1          | 42,336 - 44,352   | 2010       |
| 2          | 122,976 - 124,992 | 2011       |
| 3          | 622,944 - 624,960 | 2020       |
| 4          | 828,576 - 830,592 | 2024       |

#### Future Supply

Because Bitcoin blocks are mined continuously, Natcats supply is dynamic. Future occurrences of “3b” will introduce a new generation of Natcats. These occurrences are unpredictable: the next generation may be introduced in one year, in 50 years, or never.\
\ <br>

## Traits

Each Natcat has traits determined by its Bitcoin block number (aka Block height).&#x20;

#### Color Traits

Every Natcat has a unique color combination determined by the values present in each digit of its Bitcoin block number.  [Traits - Color Traits](/natcats/traits-color-traits.md).

#### Special Traits

Natcats will have special traits when their Bitcoin block number is a match for specific patterns. [Traits - Special Traits](/natcats/traits-special-traits.md).<br>

## Dynamic Rarity

Because Natcats supply is dynamic, the rarity of a given trait is also dynamic. A trait's rarity may increase or decrease relative to other traits as new supply is produced.\
\
Some traits occur zero times in the current Natcats supply. These traits are considered unreleased and may be introduced for the first time at a future date. There are 30+ unreleased traits in the collection, spanning both color traits and special traits.<br>

## Autonomous Evolution

Natcats’ story unfolds on the blockchain—not as fiction, but as a narrative shaped by emergent on-chain facts. This creates an experience in which both the community and the creator are witnesses to its autonomous evolution.\
\
This process will span a significant time scale—potentially outliving the project’s creator, initial holders, and even extending beyond the mining of the last Bitcoin (approx 2140).
<br>

## Deployment Documentation

Natcats is deployed on-chain to Bitcoin Ordinals using the Digital Matter Theory (DMT) Unique Non Arbitrary Token (UNAT) standard and TAP protocol.\
\
Deployment inscriptions can be found at the following inscription IDs:

<table><thead><tr><th width="363">Description</th><th>ID</th></tr></thead><tbody><tr><td><strong>3b supply element inscription</strong></td><td><a href="https://ordinals.com/inscription/af328dc8cb5955c7f9e3db10ce3bd295f8e6974a7c7af456d1beefb702b04c33i0">af328dc8cb5955c7f9e3db10ce3bd295f8e6974a7c7af456d1beefb702b04c33i0</a><br></td></tr><tr><td><strong>Deployment inscription</strong><br><em>Reinscribed on 2/19/24 to deploy UNAT standard</em></td><td><p><a href="https://ordinals.com/inscription/386b7ab9d6fd418d8757edea8de3fcb937c3bbc38f17b9b3db44fc4123f78be0i0">386b7ab9d6fd418d8757edea8de3fcb937c3bbc38f17b9b3db44fc4123f78be0i0</a></p><p><a href="https://ordinals.com/inscription/929c235fe4f247807ce2700543f84a7ba0c138fc5e1e2c887a0f91129b7beb70i0">929c235fe4f247807ce2700543f84a7ba0c138fc5e1e2c887a0f91129b7beb70i0</a> <em>(reinscription)</em><br></p></td></tr><tr><td><strong>Art render inscription</strong></td><td><a href="https://ordinals.com/inscription/06d04edf52fee74a7e9cc2d9906ade1d514c4d34c2ea9da098c4d9d2e033f140i0">06d04edf52fee74a7e9cc2d9906ade1d514c4d34c2ea9da098c4d9d2e033f140i0</a><br></td></tr><tr><td><strong>Sample mint inscription</strong><br><em>Genesis mint inscription provided as sample</em></td><td><a href="https://ordinals.com/inscription/386b7ab9d6fd418d8757edea8de3fcb937c3bbc38f17b9b3db44fc4123f78be0i0">386b7ab9d6fd418d8757edea8de3fcb937c3bbc38f17b9b3db44fc4123f78be0i0 </a><br><br></td></tr></tbody></table>

## Credits

Natcats was created by [Evonbit](https://x.com/evonbit)

Digital Matter Theory framework was created by [The Block Runner](https://x.com/TheBlockRunner)

Natcats launch partners are [The Block Runner](https://x.com/TheBlockRunner) and [Mscribe](https://x.com/mscribeio)

DMT indexing is provided by [TAP Protocol ](https://x.com/tap_protocol)\
\ <br>