> For the complete documentation index, see [llms.txt](https://docs.bitsong.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bitsong.io/products/bitsong-accounts/abstract-accounts-on-bitsong/infrastructure/registry.md).

# registry

## Registry

The Registry contract acts as the registry for all modules and accounts within the A2B platform. Bitsong Accounts can use it to claim namespaces and register their modules. The Registry contract allows modules to be queried by its namespace, name, and version, returning its reference which may be a code id or address.

### Namespaces

An account’s namespace is a unique identifier that is used to provide a publishing domain for modules and a human readable name for any Bitsong Account. Namespaces are claimed by an account and can be used to publish modules. Namespaces are unique and can only be claimed once. An account can only claim one namespace.

### Propose Modules

Developers that wish to publish modules to the Bitsong Account platform need to call ProposeModules on the Registry contract. The modules will subsequently be reviewed by the A2B platform for registration.

**Modules cannot be registered without their namespaces being claimed by an Account. This is to prevent malicious actors from registering modules under trusted namespaces.**

{% hint style="info" %}
 For mainnet deployment proposed modules are reviewed by the Bitsong Governance. To get them approved, reach out to us on Discord. For testnet deployment there is no review process.
{% endhint %}


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