OP Stack
The OP Stack is Optimism's open-source, modular toolkit for launching L2 chains: pick execution, settlement, and data layers like Lego, deploy your ow
The OP Stack is Optimism's open-source, modular toolkit for launching L2 chains: pick execution, settlement, and data layers like Lego, deploy your own rollup, optionally join the Superchain. Base is its most famous deployment.
How it works
Standardized, MIT-licensed components (op-node, op-batcher, op-proposer) plus fault-proof and governance modules. Chains built on it share Ethereum-grade tooling and can opt into shared sequencing, bridging, and Collective governance — or run fully solo.
Why it matters for decentralization
Open-source rollup kits commoditize launching chains — good for experimentation, risky in aggregate: dozens of OP Stack chains mostly running centralized sequencers multiplies the *number* of trusted operators faster than it decentralizes any of them. Judge each deployment’s operator set, not the shared brand.
Risks & trade-offs
Fork drift (customized stacks diverging from audited code); shared-upgrade dependencies; sequencer centralization replicated per chain; and governance overlap when chains join the Collective.
FAQ
OP Stack vs Arbitrum Orbit? Competing modular visions: OP Stack bets on shared standards + collective governance; Orbit bets on customization freedom. Both are legitimate; neither is decentralized by default.
Do I need to care as a user? Only for security assumptions: which sequencer, which bridge, which upgrade keys — per chain, every time.
Is the stack really open source? Yes, MIT — anyone can fork it entirely, which is the ultimate decentralization backstop.
Related terms
Optimism ·
superchain · Base ·
optimistic rollup