# Assessment 2 #### You are developing a Bitcoin application that needs to reference a previous transaction. You copy a TXID from a block explorer showing "a1b2c3d4e5f6...". What must you do before using it in raw transaction data? * [ ] Nothing, use it as-is * [x] Convert it from big-endian to little-endian by reversing the byte order * [ ] Compress it first * [ ] Add a checksum --- # 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-in-bitcoin-and-bsv/assessment-2.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.