A PBFT-based decentralized ZK-rollup sequencer network coordinates recurring Powers-of-Tau CRS generation ceremonies via smart-contract or peer-to-peer protocols, achieving continuous trusted setup with stable transaction throughput.
ChonkyBFT: Consensus Protocol of ZKsync
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abstract
We present ChonkyBFT, a partially-synchronous Byzantine fault-tolerant (BFT) consensus protocol used in the ZKsync system. The proposed protocol is a hybrid protocol inspired by FAB Paxos, Fast-HotStuff, and HotStuff-2. It is a committee-based protocol with only one round of voting, single slot finality, quadratic communication, and n >= 5f + 1 fault tolerance. This design enables its effective application within the context of the ZKsync rollup, achieving its most critical goals: simplicity, low transaction latency, and reduced system complexity. The target audience for this paper is the ZKsync community and others worldwide who seek assurance in the safety and security of the ZKsync protocols. The described consensus protocol has been implemented, analyzed, and tested using formal methods.
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Layer 2 Coordinated Trusted Setup for Continuous CRS Generation
A PBFT-based decentralized ZK-rollup sequencer network coordinates recurring Powers-of-Tau CRS generation ceremonies via smart-contract or peer-to-peer protocols, achieving continuous trusted setup with stable transaction throughput.