Layer 2 Coordinated Trusted Setup for Continuous CRS Generation

2026-07-06

AI Summary

This work addresses the inflexibility of static trusted setups in existing zero-knowledge proof systems, which hinder continuous and automated generation of public reference strings (CRS). To overcome this limitation, the authors propose a Layer 2 coordination framework that enables, for the first time within a ZK-rollup architecture, a decentralized, continuous trusted setup without centralized coordination. By decoupling transaction processing from ceremony execution, they design two protocol variants—one based on smart contracts and another on asynchronous peer-to-peer communication—leveraging PBFT consensus, non-interactive zero-knowledge proofs of knowledge (NIZKPoK), and a commit-reveal mechanism. Experimental results demonstrate that the proposed approach maintains ceremony liveness and Layer 2 transaction throughput stability under wide-area network conditions and adversarial settings, tolerating node failures and malicious behavior while effectively mitigating adaptive manipulation risks.

Abstract

Zero-knowledge proof systems rely on a trusted setup phase to generate a Common Reference String (CRS), yet existing approaches are typically static, one-time ceremonies that are inflexible and vulnerable to long-term compromise. Offloading continuous, recurring trusted setups to a decentralized Layer 2 (L2) network introduces a fundamental coordination challenge arising from the mismatch between high-throughput transaction processing and the multi-round requirements of trusted setup ceremonies. This paper presents an L2-coordinated framework that safely decouples transaction pipelines from ceremony execution to achieve automated, continuous CRS generation without centralized coordination. We design and implement two protocol variants over a decentralized, PBFT-coordinated ZK-rollup architecture: an on-chain smart contract approach and an asynchronous peer-to-peer consensus variant. Both designs utilize non-interactive zero-knowledge proofs of knowledge alongside commit-reveal structures to eliminate adaptive manipulation vectors and isolate ceremony latency. Experimental evaluations under simulated wide-area network constraints and adversarial conditions demonstrate that our architecture successfully isolates ceremony liveness. Continuous setups complete reliably within practical time bounds despite node dropouts or malicious contributions, while preserving stable L2 transaction throughput.

Problem

• trusted setup
• Common Reference String
• Layer 2
• zero-knowledge proof
• coordination challenge

Innovation

• Layer 2
• trusted setup
• continuous CRS generation
• ZK-rollup
• non-interactive zero-knowledge proof