Watchtower Nodes

Architecture

Watchtower Nodes represent a critical infrastructural component within Layer-2 scaling solutions for blockchains, particularly those employing zero-knowledge rollups. These nodes continuously monitor on-chain contract state, specifically focusing on fraud proofs and data availability challenges inherent in optimistic rollup designs. Their function is to verify the validity of rollup state transitions, acting as an independent check against potentially malicious or erroneous state updates proposed by sequencers. Effective architecture ensures timely detection of invalid state, contributing to the overall security and reliability of the Layer-2 system.