Revisiting EZBFT: A Decentralized Byzantine Fault Tolerant Protocol with Speculation

Published 9 Sep 2019 in cs.DC | (1909.03990v1)

Abstract: In this note, we revisit EZBFT[2] and present safety, liveness and execution consistency violations in the protocol. To demonstrate these violations, we present simple scenarios, involving only four replicas, two clients, and one or two owner changes. We also note shortcomings of the presented TLA+ specification used to model check the proposed protocol.

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