Layer 2 Blockchains

Architecture

Layer 2 blockchains represent a scaling solution designed to alleviate congestion and enhance transaction throughput on underlying Layer 1 networks, primarily Ethereum. These systems operate “off-chain,” processing transactions independently before periodically settling the net result on the main chain, thereby reducing the load on the primary ledger. Common architectural patterns include optimistic rollups, zero-knowledge rollups, and state channels, each employing distinct mechanisms to ensure security and validity. The design inherently introduces a trade-off between decentralization and scalability, requiring careful consideration of consensus mechanisms and data availability solutions.