Optimistic Rollup Designs

Architecture

Optimistic Rollup Designs represent a Layer 2 scaling solution for Ethereum, fundamentally altering transaction processing by executing transactions off-chain while leveraging Ethereum’s security. These designs operate on the principle of ‘optimistic’ validity, assuming transactions are valid unless challenged within a specified fraud-proof window, reducing on-chain data requirements and associated costs. The core architectural component involves a sequencer that batches transactions and posts state roots to the main chain, enabling faster and cheaper transaction throughput. This approach necessitates a dispute resolution mechanism, typically involving a fraud-proof system, to ensure data integrity and prevent invalid state transitions.