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In this paper we analyse the correctness of Istanbul BFT (IBFT), which is a
Byzantine-fault-tolerant (BFT) proof-of-authority (PoA) blockchain consensus
protocol that ensures immediate finality. We show that the IBFT protocol does
not guarantee Byzantine-fault-tolerant consistency and liveness when operating
in an eventually synchronous network, and we propose modifications to the
protocol to ensure both Byzantine-fault-tolerant consistency and liveness in
eventually synchronous settings.

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