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Hybrid Rollups

1 min read
Pronunciation
[hy-brid roh-lups]
Analogy
Like a hybrid car using both gasoline and electric power to optimize performance and efficiency.
Definition
Layer‑2 scaling solutions that combine optimistic and ZK rollup techniques to leverage benefits of both: fast deposits and low-cost proofs with fraud‑proof security.
Key Points Intro
Hybrid rollups integrate multiple verification schemes for flexible security and cost trade‑offs.
Key Points

Optimistic path: Quick inclusion with challenge window.

ZK path: Generate succinct proofs for finality.

Adaptive mode: Switch based on network load or risk.

Data availability: On‑chain blobs with optional KZG commitments.

Example
A rollup accepts transactions optimistically but periodically publishes zk‑SNARK proofs of the entire state to Ethereum for stronger guarantees.
Technical Deep Dive
Sequencer batches L2 transactions, posts calldata and state root. After challenge period, prover computes zk proof of state transitions. Bridge contract verifies SNARK via `verifyProof()` and marks batch final.
Security Warning
Combining models increases complexity; ensure both proof and fraud modules are audited.
Caveat
Proof generation latency may delay finality; balance frequency with cost.
Related Terms
Fraud Proof

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