# Spend Key #### The Basics One of the two pairs of private and public cryptographic keys that each account has, with the *private* spend key used to spend any funds in the account. #### In-depth Information The *private* spend key is a 256-bit integer that is used to sign Haven transactions. With the current deterministic key derivation method of the official wallet, the private spend key is also an alternate representation of the [mnemonic-seed](/overview/mnemonic-seed.md). It can be used to derive all other account keys. --- # 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://wiki.havenprotocol.org/overview/spend-key.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.