# Assessment 11 #### In Bitcoin, what is the data type for the private key used for signing transactions? * [x] Big number of 256-bit length * [ ] Big number of 128-bit length * [ ] Point of the elliptic curve of length 33bytes * [ ] Point of the elliptic curve of length 65 bytes --- # 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-digital-signatures/bsv-and-digital-signatures/assessment-11.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.