What Is Layer 1?
Layer 1 (L1) refers to the base blockchain network — the foundational protocol that processes and finalizes transactions using its own consensus mechanism. Bitcoin, Ethereum, Solana, Avalanche, and Cardano are all Layer 1 blockchains. They provide the security, consensus, and data availability that everything else builds on.
How Layer 1 Works
L1 blockchains face the "blockchain trilemma" — the challenge of simultaneously achieving decentralization, security, and scalability. Bitcoin prioritizes security and decentralization (slow but secure). Solana prioritizes scalability and speed (faster but more centralized). Ethereum aims for balance through a roadmap that offloads scalability to Layer 2 solutions while maintaining L1 security.
Why It Matters for Traders
L1 tokens (BTC, ETH, SOL) are the blue-chip investments of crypto because they capture the base-layer value of their ecosystems. All activity on a chain ultimately pays fees to the L1, making L1 tokens similar to "digital real estate" — they appreciate as more economic activity occurs on the network. Comparing L1 metrics (TVL, active addresses, revenue) is fundamental to cross-chain valuation.