> For the complete documentation index, see [llms.txt](https://cardano-course.gitbook.io/cardano-course/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cardano-course.gitbook.io/cardano-course/handbook/protocol-parameters-and-configuration-files/byron-genesis-file.md).

# Byron genesis file

## Cardano mainnet Byron genesis file:

{% embed url="<https://book.world.dev.cardano.org/environments/mainnet/byron-genesis.json>" %}

```bash
cardano-cli byron genesis print-genesis-hash --genesis-json mainnet-byron-genesis.json
5f20df933584822601f9e3f8c024eb5eb252fe8cefb24d1317dc3d432e940ebb
```