Mir-BFT：高吞吐量分散网络鲁棒BFT
Mir-BFT: High-Throughput Robust BFT for Decentralized Networks
摘要：
本文介绍了Mir-BFT，这是一种强大的拜占庭容错（BFT）全序广播协议，旨在最大限度地提高广域网（WAN）的吞吐量，目标是分散网络中的部署，例如许可和权益证明许可的区块链系统。Mir-BFT是第一个允许多个领导者独立提出请求批次的BFT协议（即，并行领导者），以排除恶意（拜占庭）客户端的请求重复攻击的方式，通过将分区的请求散列空间的分配旋转到领导者。由于这种机制消除了单个领导者的带宽瓶颈，并暴露了即使在WAN上也与客户端身份验证相关的计算瓶颈，因此我们的协议使用客户端签名验证分片优化进一步提高了吞吐量。我们的评估表明，Mir-BFT优于最先进的技术，在广泛分布的100个节点上，每秒订购超过60000个签名比特币大小（500字节）的交易，1 Gbps WAN设置，典型的延迟时间为几秒钟。我们还评估了Mir-BFT在不同的崩溃和拜占庭故障，证明其性能的鲁棒性。Mir-BFT依赖于经典的BFT协议构造，这简化了对其正确性的推理。具体来说，Mir-BFT是著名的和仔细审查的PBFT协议的推广。简而言之，Mir-BFT遵循PBFT“安全性”，需要进行更改以适应限于PBFT活性的新功能。
英文摘要：
This paper presents Mir-BFT, a robust Byzantine fault-tolerant (BFT) total order broadcast protocol aimed at maximizing throughput on wide-area networks (WANs), targeting deployments in decentralized networks, such as permissioned and Proof-of-Stake permissionless blockchain systems. Mir-BFT is the first BFT protocol that allows multiple leaders to propose request batches independently (i.e., parallel leaders), in a way that precludes request duplication attacks by malicious (Byzantine) clients, by rotating the assignment of a partitioned request hash space to leaders. As this mechanism removes a single-leader bandwidth bottleneck and exposes a computation bottleneck related to authenticating clients even on a WAN, our protocol further boosts throughput using a client signature verification sharding optimization. Our evaluation shows that Mir-BFT outperforms state-of-the-art and orders more than 60000 signed Bitcoin-sized (500-byte) transactions per second on a widely distributed 100 nodes, 1 Gbps WAN setup, with typical latencies of few seconds. We also evaluate Mir-BFT under different crash and Byzantine faults, demonstrating its performance robustness. Mir-BFT relies on classical BFT protocol constructs, which simplifies reasoning about its correctness. Specifically, Mir-BFT is a generalization of the celebrated and scrutinized PBFT protocol. In a nutshell, Mir-BFT follows PBFT "safety-wise", with changes needed to accommodate novel features restricted to PBFT liveness.
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