# FAQ ## Where are users' private keys held? We've adopted an architecture called Delegated Key Management, where keys are generated on the client-side and encrypted *directly* with AWS KMS through Cognito, without Fortmatic ever seeing the private key at any part of the flow. You can read more about it in our more comprehensive [security blog post](https://link.medium.com/x0IJMN7YD1)! ## Is the Fortmatic SDK open source? We will be open sourcing our SDK code soon! We are polishing it up and getting the proper testing and contribution process in place before open sourcing it. Stay tuned in our [Telegram](https://t.me/fortmatic)! --- # 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://docs.fortmatic.com/v1.x/faq.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.