OP Mainnet vs Starknet

OP Mainnet (Optimism) is an optimistic rollup that batches transactions to Ethereum and relies on fraud proofs submitted during a seven‑day challenge window. The Bedrock upgrade in 2023 cut L1 calldata costs by 40 % and introduced multi‑proof modularity. ‘RetroPGF’ rounds redistribute protocol revenue to public‑goods builders, governed by the OP token‑holder Collective.

Starknet is a STARK‑based validity rollup where smart contracts are written in Cairo and executed off‑chain, with succinct proofs verified on Ethereum. The 2024 Madara sequencer supports parallel execution, and the ‘Quantum Leap’ upgrade reduced L1 calldata by 30 %. STRK token launched in February 2025, enabling slot auctions for sequencer decentralization roadmap.