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

# DNA

Breedy Birds have four base pairs that are concatenated with hyphens and then hashed using the [SHA1 hashing algorithm](http://www.sha1-online.com/). Base pairs are pairs of two capital letters: `A`, `B`, and `C`. Each pair represents a visual attribute of the offspring DNA: Beak, Body, Eyes, and Head.

Six varieties of each visual attribute will be commissioned to represent all unique letter pairings: `AA`, `AB`, `AC`, `BB`, `BC`, and `CC`. Therefore, offspring will be generated by sampling a random letter from each of its parents' base pairs. Offspring DNA will be generated by concatenating their parents' DNA hashes and running that through the SHA1 hashing algorithm: `sha1(<male dna>-<female dna>)`.

For example, let's say Breedy Bird #01 breeds with Breedy Bird #04:

* \#01 base pairs: `BA-CB-CB-CC`
* \#01 DNA: `1b8e98d6cc666bfd6a64cda64cedee514da4b07a`
* \#04 base pairs: `AC-CC-AB-CB`
* \#04 DNA: `a9686e968ef0dbf77ef6ee83346ca20abb008567`
* Offspring possible beaks: `AA`, `AB`, `AC`, `BC`
* Offspring possible bodies: `BC`, `CC`
* Offspring possible eyes: `AB`, `AC`, `BB`, `BC`
* Offspring possible heads: `BC`, `CC`
* Number of possible combinations: 64
* Offspring DNA: `79894f15561725a16c0561d8dafa6d9dc72ea8d6`

All of this is being done to ensure that offspring are generated in a totally deterministic and verifiable manner.


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