# Assessment 18 #### When a valid solution to the hash puzzle is found, what must a node immediately do? * [x] Broadcast the block to as many nodes on the network as possible. * [ ] Submit a request for payment of the block reward. * [ ] Make sure that all transactions that made it in to their block are valid. * [ ] Assess the new difficulty to see if it's economically viable to commit hash to the next block. --- # 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://hub.bsvblockchain.org/higher-learning/bsv-academy/bitcoin-primitives-merkle-trees/merkle-trees-final-assessment/assessment-18.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.