Table of contents
What Layer-2s are and why 2025 matters
How rollups work
Milestones since 2024
The two big designs: optimistic vs. ZK
Data availability in 2025: Ethereum blobs and alt-DA
Sequencers and the push to decentralize ordering
How to choose an L2 in 2025
Beyond Ethereum: OP Stack chains and SVM L2s
FAQs
What Layer-2s are and why 2025 matters
Layer-2 networks scale Ethereum by executing transactions off-chain and periodically…
