# Challenger Component The Challenger is a trusted entity in the Xai ecosystem. It creates a BLS key-pair and registers the public key with the Referee. When an assertion is made by a validator in the Xai rollup protocol, the Challenger signs the assertion with its private key and submits the signature to the Referee. The Referee verifies the signature and records it as a challenge associated with the assertion. This process ensures the integrity of the assertions made in the Xai rollup protocol. --- # 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://xai-foundation.gitbook.io/xai-network/en/about-xai/sentry-keys-explained/challenger-component.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.