# Known Identifiers The Known Identifiers tool can be a simple and very powerful way to confirm that a person is only using one BrightID account. It relies on an Aura Player knowing which identifiers (such as social accounts, legal names, addresses, phone numbers) are associated with a person. This knowledge comes from an existing relationship with that person, since [Aura Players should not ask subjects for personally identifying information](/aura/intro/how-aura-works.md#privacy). Using a [Socialist Millionaire Protocol](https://en.wikipedia.org/wiki/Socialist_millionaire_problem#Off-the-Record_Messaging_protocol), Aura Players can agree on the same BrightID account without revealing any new private information to each other. [See the post on known identifiers for a full description.](https://hackmd.io/@castall/BJblkURE5) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://brightid.gitbook.io/aura/future-tools/known-identifiers.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.