> For the complete documentation index, see [llms.txt](https://docs.quipuswap.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.quipuswap.com/smart-contracts/dex-2.0/bakerregistry-contract/storage-and-types-overview.md).

# Storage and types overview

### storage\_t - main contract storage

```pascaligo
type storage_t          is big_map(key_hash, bool)
```

<table><thead><tr><th width="150">Field</th><th width="150">Type</th><th>Description</th></tr></thead><tbody><tr><td>storage_t</td><td>big_map(key_hash, bool)</td><td>Mapping of bakers' addresses to boolean flag: baker is registered in registry or not. Only valid bakers can be registered</td></tr></tbody></table>