OP Mainnet
Optimism’s optimistic rollup network for Ethereum, delivering low-cost, high-speed transactions.
What is OP Mainnet?
OP Mainnet, launched in 2021 by OP Labs, is an EVM-equivalent optimistic rollup that batches transactions off-chain and posts data to Ethereum. It uses fraud proofs with a 7-day challenge window, securing over $10 billion in TVL and processing 50 million monthly transactions as of 2025.
As the core of the Optimism ecosystem, OP Mainnet powers dApps like Uniswap, with single-round fault proofs reducing confirmation times to 1 hour post-2024 upgrades. Its open-source nature has spawned 20+ chains in the Superchain.
Related Terms
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51% Attack
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Aave
A decentralized non-c custodial liquidity protocol for lending and borrowing digital assets on blockchains like Ethereum.
Buy Walls
Large accumulations of buy orders at a specific price level, forming a barrier against downward price movement.
EIP (Ethereum Improvement Proposal)
A standardized process for proposing and implementing changes to the Ethereum protocol.
Don't Trust, Verify
"Don't Trust, Verify" is a core principle in blockchain technology, emphasizing that users should independently validate transactions and data on the network rather than relying on intermediaries.