Hmm... how does it work? Say I finish the view change and then everybody loses power. When the power comes back, how do you know what the old view was? What

Hmm... how does it work? Say I finish the view change and then everybody loses power. When the power comes back, how do you know what the old view was? What prevents two distinct nodes from being both leaders of view v+1 (one before the power loss and one after power comes back) thus issuing inconsistent messages?