# Requirements for Synchronizers Mining pools that have successfully mined blocks in the last 432 Bitcoin blocks (approximately 72 hours) are eligible to become Synchronizers and submit BTC data to exSat. Mining pools must include a specific OP\_RETURN output in the coinbase transaction of each Bitcoin block they mine. This output serves to identify the block as being mined by the pool. For detailed instructions on how to register as Synchronizer, please refer [here](/guides-of-data-consensus/others/operation-references/synchronizer-operations/synchronizer-registration.md). --- # 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://docs.exsat.network/guides-of-data-consensus/run-a-sychronizer/requirements-for-synchronizers.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.