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OP Mainnet vs Arbitrum One

Which is more decentralized — OP Mainnet or Arbitrum One? A side-by-side on consensus, nodes, clients and governance.

OP MainnetArbitrum One
GradeC+C+
TypeL2 · Optimistic rollupL2 · Optimistic rollup
Nakamoto / stageStage 1Stage 1
Node / validator setInherits Ethereum securityInherits Ethereum security
Clients / sequencerSingle sequencer (OP Foundation)Single sequencer (Offchain Labs)
GovernanceOptimism Collective (two houses)Arbitrum DAO + Security Council
Key riskCentralized sequencerCentralized sequencer

OP Mainnet C+

  • L2BEAT Stage 1
  • Concrete shared-sequencing roadmap
  • Superchain network effects
  • Centralized sequencer today
  • Foundation influence

Arbitrum One C+

  • L2BEAT Stage 1
  • Permissionless exits + 7-day upgrade timelock
  • Active Arbitrum DAO
  • Centralized sequencer
  • Security Council can fast-track upgrades

Bottom line

Stage 1 with the clearest path to decentralized sequencing. Among the most decentralized L2s — sequencer decentralization is the remaining step.