# Master Node Master Nodes are integral components of the Subnet infrastructure, performing several critical functions: **Transaction Management:** * Store all Subnet transactions * Validate all Subnet transactions **Data Availability Layer (DAL):** * Serve as the DAL for all Subnet Decentralized Applications * Ensure data accessibility and integrity for the Subnet Ecosystem **Cross-Network Operations:** * Submit and Verify proofs between the Subnet and Mainnet * Data Transmission between Subnet Protocols **Reward Structure: Master Nodes receive compensation for their services through:** * A portion of Subnet transaction fees * Rewards for proof submission and verification between Subnet and Mainnet *By fulfilling these roles, Master Nodes contribute to the security, reliability, and interoperability of the Subnet network, while also maintaining a connection with the main blockchain.* --- # 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://documentation.depinsubnet.com/subnet-node-type/master-node.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.