Haven't read it carefully, so I might have missed the reference, but Barbara Liskov has described a very similar optimization for Viewstamped Replication[1] [1

Haven't read it carefully, so I might have missed the reference, but Barbara Liskov has described a very similar optimization for Viewstamped Replication[1] [1] http://www.pmg.csail.mit.edu/papers/vr-to-bft.pdf http://www.pmg.csail.mit.edu/papers/vr-to-bft.pdf