> For the complete documentation index, see [llms.txt](https://faq.blink.sv/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.blink.sv/custody-and-security/what-is-a-multisignature-wallet.md). # What is a Multisignature Wallet? **Multisignature** (multisig) is a security mechanism that involves multiple private keys to authorize a Bitcoin transaction. Instead of a single private key controlling the transaction, multisig requires two or more private keys to sign off on a transaction before it can be executed. This adds an extra layer of security to prevent unauthorized access and potential theft of funds. While it's true that the principles of Bitcoin emphasize individual control of one's private keys, there are still valid reasons to use a service like Blink's Custodial Mode. Custodial wallets can offer additional security measures such as multisig, which can provide an extra layer of protection for users' funds. Additionally, using a managed wallet can provide peace of mind for users who may be less experienced with managing their own private keys or who simply prefer the convenience and ease of use that it can offer. Ultimately, the choice of wallet comes down to individual preferences and risk tolerance. **Note:** The multisig cold storage described above applies to Blink's Custodial Mode. In Non-Custodial Mode, you hold your own keys via the Spark protocol and your funds are not held in Blink's multisig system. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://faq.blink.sv/custody-and-security/what-is-a-multisignature-wallet.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.