Layer 1 is the base blockchain. Layer 2 runs on top, faster and cheaper. Understanding this is essential for navigating modern crypto — ETH vs ARB, Ethereum vs Polygon, Bitcoin vs Lightning.
Layer 1 blockchains: Bitcoin, Ethereum, Solana, Cardano, Avalanche. They process and settle transactions on their own chain. They are decentralized, secure, slow. Ethereum: 15 TPS. Solana: 65,000 TPS. Bitcoin: 7 TPS. L1 security is the gold standard.
Layer 2 blockchains (Arbitrum, Optimism, Base, Polygon) run on top of Ethereum. They process transactions fast and cheap, then periodically settle batches on Ethereum for security. Arbitrum: 45,000 TPS at $0.04 gas. Same Ethereum security, 99% lower cost.
L1 tokens (ETH, SOL): more established, lower risk, benefit from all activity on the chain. L2 tokens (ARB, OP): higher upside if L2 adoption accelerates, but dependent on L1 ecosystem health. ARB at $0.95 is ~4x from ATH — speculative but with real usage behind it.
Most blockchain experts believe L2s are the long-term scaling solution for Ethereum. If true, ARB, OP, and zkSync benefit from Ethereum's security moat while capturing the activity. Ethereum stays the settlement layer; L2s become where users live. Both benefit.
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