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arXiv · 2608.19629

Optimality and Trade-offs in Fast BFT SMR (Extended Version)

Neil Giridharan·Minh Tung Nguyen·Ittai Abraham·Allen Clement·Natacha Crooks·Pierre Sutra
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Abstract

Fast state-machine replication (SMR) protocols in the crash-fault setting have attracted significant interest in both academia and industry. This interest stems from their advantages over leader-based protocols, including low execution latency for non-conflicting commands, high throughput, improved availability, and increased fairness. While Fast SMR is well studied in the crash-fault setting, the Byzantine fault-tolerant (BFT) setting remains much less understood, with only a small number of existing Fast BFT SMR protocols. In this paper, we present tight upper and lower bounds on the replication factor required for Fast BFT SMR. We also present a suboptimal protocol that illustrates a trade-off between replication factor and recovery efficiency.

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Neil Giridharan, Minh Tung Nguyen, Ittai Abraham, Allen Clement, Natacha Crooks, Pierre Sutra. 2026-08-20. Optimality and Trade-offs in Fast BFT SMR (Extended Version). https://arxiv.org/abs/2608.19629

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