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by NickBusey 3416 days ago
This is answered in the FAQ at the bottom of the post.

You'll see this policy in action when you install Keybase on a 2nd computer. It'll make you either (a) type something on your first computer, or (b) enter a paper key. This isn't just two-factor auth with server trust. The old key is signing a statement about the new key, and the new key is countersigning.