> For the complete documentation index, see [llms.txt](https://docs.swipe.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.swipe.org/swipechain/swipe-nodes/churn.md). # Churn SwipeChain actively churns its validator set to prevent stagnation and capture, and ensure liveness in signing committees. Churning is also the mechanism by which the SwipeNode software can safely facilitate non-contentious upgrades. Every 50000 blocks (3 days) SwipeChain will schedule the oldest and the most unreliable node to leave, and rotate in two new nodes. The next two nodes chosen are simply the nodes with the highest bond. During a churn event the following happens: * The incoming nodes participate in a TSS key-generation event to create new Asgard vault addresses * When successful, the new vault is tested with a on-chain challenge-response. * If successful, the vaults are rolled forward, moving all assets from the old vault to the new vault. * The outgoing nodes are refunded their bond and removed from the 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://docs.swipe.org/swipechain/swipe-nodes/churn.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.