> For the complete documentation index, see [llms.txt](https://docs.zecblocks.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zecblocks.xyz/bitmap-v1.md).

# Bitmap v1

`BITMAP_V1` is the deterministic rendering algorithm for ZEC BLOCKS.

Its purpose is to make the primary artwork reproducible from public chain data instead of requiring an externally hosted image file as the authoritative asset.

## Inputs

At minimum, the generator is bound to the token's deterministic source block.

The canonical source block is derived using:

```
source_height = genesis_confirmation_height - token_id
```

The block hash and other explicitly published v1 fields act as deterministic generator inputs.

## Rendering direction

The reference visual style is:

* clean bitmap / ordinal aesthetic
* crisp pixel edges
* deterministic 24 × 24 logical grid
* deterministic composition and palette selection
* no dependency on hosted PNG metadata as the source of truth

## Determinism requirement

Given identical:

* Genesis
* token ID
* source block data
* `BITMAP_V1` implementation

two compliant clients must render the same principal artwork.

The public reference implementation will publish the complete generator code before public mining opens.