# Authentication

Authentication via [Flashbots standard](https://docs.flashbots.net/flashbots-auction/searchers/advanced/rpc-endpoint#authentication) is optional but encouraged. By default, authentication moves you into the Medium Priority queue.

## **There are three priority queues**

* **High:** signed header + reputation
* **Med:** signed header
* **Low:** unsigned header

Higher priority queues have higher inclusion rates as bundles will be added to the pool faster, allowing for later submissions.