Optimism Bridge protocol
Overview
The Optimism Standard Bridge is the canonical token bridge between Ethereum and OP Mainnet, implemented as a pair of contracts — L1StandardBridge on Ethereum and L2StandardBridge on OP Mainnet — that communicate through the CrossDomainMessenger system. Deposits use a lock-and-mint model: a user approves the bridge, calls `bridgeERC20To()` naming the native token, its bridged representation, the recipient and the amount; the bridge locks the native tokens on L1 and records them in a deposits mapping, then sends a cross-chain message that mints the equivalent bridged token on L2. Deposits from Ethereum to OP Mainnet usually complete within one to three minutes. Withdrawals reverse the flow with a burn-and-unlock model — the bridged token is burned on L2 and a message unlocks the native token on L1 — but take seven days, because that is the optimistic rollup withdrawal challenge period during which a fraudulent state root could be disputed. ETH is bridged more simply via `bridgeETH()` or `bridgeETHTo()`. The bridge does not support fee-on-transfer or rebasing tokens, since their changing balances would break its accounting. The Standard Bridge is the reference bridging implementation of the OP Stack and is reused by chains across the Superchain, with the seven-day withdrawal window a direct consequence of the optimistic rollup fraud-proof design.
Within the DeFi Intel graph, Optimism Bridge connects to 10 tracked entities, most strongly to Ethereum, Base, OP.
Relations
Top connections in the DeFi Intel knowledge graph (confidence-weighted, 10 of 10 total).
| Relation | Connected entity | Confidence |
|---|---|---|
deployed_on | Ethereum | 95% |
deployed_on | Base | 95% |
supports_token | OP | 95% |
deployed_on | Pgn | 95% |
audited_by | OpenZeppelin | 90% |
audited_by | Trail of Bits | 90% |
deployed_on | Optimism | 85% |
audited_by | Cantina | 85% |
audited_by | Spearbit | 85% |
audited_by | Sigma Prime | 85% |
Frequently asked questions
What is Optimism Bridge?
Optimism Bridge is a canonical bridge tracked in the DeFi Intel knowledge graph. It is connected to 10 other tracked entities, most strongly to Ethereum, Base, OP.
What type of entity is Optimism Bridge?
Optimism Bridge is classified as a canonical bridge (protocol) in the DeFi Intel knowledge graph.
What is Optimism Bridge connected to?
In the DeFi Intel knowledge graph, Optimism Bridge is linked to 10 other tracked entities, most strongly to Ethereum, Base, OP.
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