# Bool Chain Bool Chain is developed based on Polkdot Substrate framwork and implements **Nominated Proof-of-Stake (NPoS)** consensus algorithm to improve the overall security of the network. Nominators and Validators are two vital roles in a NPoS network. Nominators are responsible to nominate the most reliable nodes to validate new blocks within the network. Validators refer to nodes that have been nominated by nominators and are allowed to verify new transactions and earn rewards for their contributions to the network security. Developers can follow guides provided in [Node operators](/develop-guide/testnet/bool-chain/node-operators.md) to run their individual nodes within the Bool Chain, and further become [Validators ](/develop-guide/testnet/bool-chain/validators.md)to maintain the network consensus. --- # 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.bool.network/develop-guide/testnet/bool-chain.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.