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Layer 2 and Scaling
Ethereum is the most used smart contract platform — and the most congested. This path explains the scaling problem and every major solution being built right now.
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What you'll understand after this path
- Why Ethereum has a gas fee problem and what causes it
- The difference between optimistic rollups and ZK rollups
- How Arbitrum and Optimism process transactions and settle to Ethereum
- What zero-knowledge proofs are and why they matter for scaling
- How zkSync and Starknet differ technically
- What data availability is and why Celestia is solving a separate problem
- How to evaluate which L2 is right for which use case
- Where the Ethereum scaling roadmap is heading
Curriculum — 8 pages, read in order
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2What L2 means, why it exists, and the taxonomy of scaling solutions.Read page →
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3The leading optimistic rollup. Fraud proofs, 7-day challenge window, Nitro architecture.Read page →
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4OP Stack, the Superchain vision, and how Optimism differs from Arbitrum.Read page →
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5ZK rollups vs optimistic rollups. Boojum proof system, ZK Stack, Elastic Chain.Read page →
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6STARK proofs, Cairo language, no trusted setup, quantum resistance, SHARP prover.Read page →
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7Modular blockchains. Why data availability is a separate problem from execution.Read page →
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8What ZK proofs actually are — the mathematics and intuition.Read page →
Progress is saved in your browser only — no account, no tracking. All pages use official sources — whitepapers, academic papers, government publications. Three reading levels on every page: Curious (plain English), Exploring (practical), Deep Dive (technical).