Briefing
The foundational problem addressed is the centralization of the prover role in Zero-Knowledge Rollups, which introduces a single point of failure for transaction finality and concentrates economic profit. The proposed solution is a Two-Step Submission Algorithm that transforms proof generation into a decentralized, permissionless Proof-of-Work-like competition. This mechanism requires provers to first commit to a proof’s existence by submitting a cryptographic hash of the proof and their address, followed by a later submission of the full proof for verification and reward. This breakthrough ensures network liveness by allowing any prover to submit a valid proof, thereby cryptographically eliminating the single-node dependency and establishing a more robust and economically fair architecture for future scalable decentralized systems.
Context
The prevailing architecture for early ZK-Rollups, such as Polygon zkEVM and zkSync era, relies on a centralized or trusted aggregator/prover to generate and submit the cryptographic validity proofs to the Layer 1 chain. This design choice, while simplifying initial deployment, creates a critical vulnerability ∞ a single-node failure or malicious prover can halt the submission of the validity proof, compromising the finality and liveness of the entire Layer 2 network. Furthermore, the centralized control over the high-cost, high-reward proof generation process centralizes profit, which undermines the core ethos of decentralized token economics and network participation.
Analysis
The core mechanism introduces a novel two-phase commitment and revelation protocol to decentralize the prover function and mitigate race conditions. The first phase, the Commitment Phase , requires a prover who has successfully generated a Zero-Knowledge Proof (ZKP) to calculate a hash of the proof data concatenated with their wallet address, then submit only this hash to the on-chain smart contract. This step establishes their claim to the proof without revealing the computationally expensive ZKP itself. The second phase, the Revelation Phase , begins after a specified block delay.
During this phase, any prover can submit the full ZKP to the contract for verification. This two-step process prevents a “race attack,” where multiple provers submit the full ZKP simultaneously, wasting computational resources. By allowing any prover to submit a valid ZKP after the delay, the system ensures that a single node’s failure cannot prevent finality. The economic model then rewards the prover who successfully submits a verified proof based on a Proof-of-Work reward structure.
Parameters
- Commitment Identifier ∞ Hash of (Proof Data / Prover Address) – The unique cryptographic commitment submitted in the first step to claim a proof generation reward.
- Revelation Window Start ∞ T+11th Block – The earliest point at which any prover can submit the full ZKP for verification.
- Finality Deadline ∞ T+20th Block – The block by which a verified ZKP must be submitted, after which the sequence is reopened and non-submitting provers are penalized.
- Economic Model ∞ Proof-of-Work Rewards – The incentive structure used to reward validated provers based on their staked amounts, encouraging stable computation.
Outlook
This two-step submission protocol establishes a new baseline for ZK-Rollup infrastructure, moving the technology from a semi-decentralized operational model to a fully permissionless one. Over the next three to five years, this foundational work will enable the creation of robust, censorship-resistant ZK-Rollups that can scale to meet mass-market demand without sacrificing security or liveness. The research opens new avenues for exploring decentralized proving markets, where specialized hardware can be utilized efficiently, and for formally integrating cryptographic work into a fair economic mechanism design. This shift is critical for the long-term viability of ZK-Rollups as the dominant Layer 2 scaling solution.
