Owner key

Register the passkeys that approve owner actions (installs on the server) on the Builder's Questions page. Register at least two: one in iCloud Keychain and one in Google Password Manager, so either your iPhone, your Android phone or this computer can approve. On a computer, choose the phone with the QR code when the browser offers it. Nothing is sent anywhere: copy each public key into a file, or download it, for the bootstrap, and note each fingerprint.