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

# BrightID domain

In the BrightID domain, experts evaluate whether a BrightID identifier is a person's only identifier or a duplicate. This can result in a positive Aura verification level, which can unlock that person's ability to link to apps that want an assurance that they only have one account.

Integrating apps can let users log in normally using OAuth or Passkeys or [the BrightID mobile app](/aura/getting-started/get-brightid.md) can be used to create a universal, socially recoverable identifier.