Overview
Summary
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The verification of Layer 2 state can be categorized into two types: fraud proof and validity proof. However, Morph proposes a new verification method called Responsive Validity Proof that combines the benefits of both methods.
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The problem with fraud proofs is the wastage of capital efficiency and low security assumptions. Additionally, no OP-Rollup has implemented a permissionless fraud-proof challenge mechanism. On the other hand, although validity proofs have high security assumptions and theoretical timeliness, practical operation faces cost and efficiency issues that impede the scalability of Rollups.
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Morph combines Optimistic Rollup with Validity Proof and utilizes ZK-Proof to verify the correctness of the state. This approach is different from ZK-Rollups as the ZK-proof is only generated when there is a state challenge. This method reduces the high cost of ZK-proof generation and shortens withdrawal periods based on the nature of validity proofs.
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By implementing ZK-Proof generation and verification, Morph can seamlessly switch to a complete ZK-Rollup in the future.