Sui Lutris: A blockchain combining broadcast and consensus Blackshear, Sam Chursin, Andrey Danezis, George Kichidis, Anastasios Kokoris Kogias, Eleftherios Li, Xun Logan, Mark Menon, Ashok Nowacki, Todd Sonnino, Alberto Williams, Brandon Zhang, Lu Sui Lutris is the first smart-contract platform to sustainably achieve sub-second finality. It achieves this significant decrease by employing consensusless agreement not only for simple payments but for a large variety of transactions. Unlike prior work, Sui Lutris neither compromises expressiveness nor throughput and can run perpetually without restarts. Sui Lutris achieves this by safely integrating consensuless agreement with a high-throughput consensus protocol that is invoked out of the critical finality path but ensures that when a transaction is at risk of inconsistent concurrent accesses, its settlement is delayed until the total ordering is resolved. Building such a hybrid architecture is especially delicate during reconfiguration events, where the system needs to preserve the safety of the consensusless path without compromising the long-term liveness of potentially misconfigured clients. We thus develop a novel reconfiguration protocol, the first to provably show the safe and efficient reconfiguration of a consensusless blockchain. Sui Lutris is currently running in production and underpins the Sui smart-contract platform. Combined with the use of Objects instead of accounts it enables the safe execution of smart contracts that expose objects as a first-class resource. In our experiments Sui Lutris achieves latency lower than 0.5 seconds for throughput up to 5,000 certificates per second (150k ops/s with transaction blocks), compared to the state-of-the-art real-world consensus latencies of 3 seconds. Furthermore, it gracefully handles validators crash-recovery and does not suffer visible performance degradation during reconfiguration. ACM 2024 info:eu-repo/semantics/conferenceObject doc-type:conferenceObject conferenceObject http://purl.org/coar/resource_type/c_5794 https://research-explorer.ista.ac.at/record/18957 Blackshear S, Chursin A, Danezis G, et al. Sui Lutris: A blockchain combining broadcast and consensus. In: <i>Proceedings of the 2024 on ACM SIGSAC Conference on Computer and Communications Security</i>. ACM; 2024:2606-2620. doi:<a href="https://doi.org/10.1145/3658644.3670286">10.1145/3658644.3670286</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1145/3658644.3670286 info:eu-repo/semantics/altIdentifier/isbn/9798400706363 info:eu-repo/semantics/altIdentifier/wos/001436367300178 info:eu-repo/semantics/altIdentifier/arxiv/2310.18042 info:eu-repo/semantics/openAccess