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Ethereum10 min read

Ethereum Layer 2 Rollups: Optimistic Rollups vs ZK-Rollups and EIP-4844 Blobs

Comprehensive guide to L2 scaling: fraud proofs, validity proofs, sequencer centralization, and the revolutionary fee reduction of EIP-4844 blobspace.

Marcus Vance(Lead Blockchain Architect)
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Updated 2025-02-23
Executive Summary

How Layer 2 rollups bundle thousands of transactions off-chain, posting cryptographic compressed proofs to Ethereum Mainnet at 95% lower cost.

1. Off-Chain Execution with On-Chain Security

Layer 2 rollups execute transactions outside the congested Ethereum L1 execution environment, bundle state changes, and anchor data availability to Ethereum.

Following Ethereum's Dencun upgrade (EIP-4844), rollups write transaction data into temporary data 'blobs' instead of costly calldata, reducing L2 transfer fees to fractions of a cent.

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Frequently Asked Questions

Optimistic rollups require a 7-day challenge window to give verifiers time to submit fraud proofs before funds can be withdrawn back to Ethereum L1.