Layer 2 Scaling Solutions

Ethereum's 'rollup-centric roadmap' envisions the base chain providing security while Layer 2 networks handle daily transactions. Optimistic rollups (Arbitrum, Optimism, Base) assume transactions are valid and verify only if challenged. They offer full EVM compatibility, existing dApps work with virtually no code changes.

ZK-rollups (zkSync, StarkNet, Scroll) use zero-knowledge proofs to cryptographically verify transaction batches. They offer faster finality and stronger security but are more complex. The gap is closing rapidly with zkEVM technology making ZK-rollups increasingly developer-friendly.

As of 2025, combined L2 TVL exceeds $50 billion. Transaction costs are often under $0.01. Throughput exceeds 10,000 TPS aggregate. For most users, the vast majority of DeFi, NFT, and gaming activity happens on L2s rather than Ethereum mainnet.

Bridging moves assets between L1 and L2s. Native bridges are safest but can be slow (7-day withdrawal for optimistic rollups). Third-party bridges (Across, Stargate) offer speed but additional risk. Always verify you're using official bridges and that your wallet is on the correct network. Pick one or two L2s with the apps you want and enjoy fast, cheap transactions.