Layer 2 / Couche 2
Solution built on top of a main blockchain to improve its performance.
Beginner-friendly explanation
Layer 2 is a technology built on an existing blockchain to make transactions faster and cheaper. Example: The Lightning Network is a Layer 2 solution for Bitcoin.
Intermediate-level insight
Layer 2 handles transactions off the main blockchain, then bundles them to minimize load. They use mechanisms like rollups or state channels. Example: Optimism and Arbitrum are Layer 2s that bundle Ethereum transactions to lower costs.
Advanced perspective
Layer 2 solutions optimize scalability while ensuring secure finality on Layer 1. Their challenges include compatibility, cross-layer bridge security, and censorship resistance. Example: An exploit on a Layer 2 bridge can compromise security even if Layer 1 remains intact.
Blockchain & Technology
layer 2, scalability solution, rollups, state channels, Lightning Network, Optimism, Arbitrum