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This paper presents Mir-BFT, a robust Byzantine fault-tolerant (BFT) totalorder broadcast protocol aimed at maximizing throughput on wide-area networks(WANs), targeting deployments in decentralized networks, such as permissionedand Proof-of-Stake permissionless blockchain systems.  Mir-BFT is the first BFT protocol that allows multiple leaders to proposerequest batches independently (i.e., parallel leaders), in a way that precludesrequest duplication attacks by malicious (Byzantine) clients, by rotating theassignment of a partitioned request hash space to leaders.  As this mechanism removes a single-leader bandwidth bottleneck and exposes acomputation bottleneck related to authenticating clients even on a WAN, ourprotocol further boosts throughput using a client signature verificationsharding optimization.  Our evaluation shows that Mir-BFT outperforms state-of-the-art and ordersmore than 60000 signed Bitcoin-sized (500-byte) transactions per second on awidely distributed 100 nodes, 1 Gbps WAN setup, with typical latencies of fewseconds.  We also evaluate Mir-BFT under different crash and Byzantine faults,demonstrating its performance robustness.  Mir-BFT relies on classical BFT protocol constructs, which simplifiesreasoning about its correctness.  Specifically, Mir-BFT is a generalization of the celebrated and scrutinizedPBFT protocol. In a nutshell, Mir-BFT follows PBFT "safety-wise", with changesneeded to accommodate novel features restricted to PBFT liveness.

Mir-BFT: High-Throughput Robust BFT for Decentralized Networks