← All chains
A L2BEAT Stage 1 rollup with permissionless exits — but still a single sequencer.
L2Optimistic rollup
- Type
- L2 · Optimistic rollup
- How it works
- Optimistic rollup settling to Ethereum. At Stage 1, users can always withdraw without operator help, a Security Council guards upgrades, and changes face a ≥7-day timelock. BoLD adds permissionless validation.
- L2BEAT stage
- Stage 1
- Node / validator set
- Inherits Ethereum security
- Sequencer
- Single sequencer (Offchain Labs)
- Governance
- Arbitrum DAO + Security Council
- Key risk
- Centralized sequencer
Assessment
Arbitrum is one of the most decentralized L2s on paper: L2BEAT Stage 1, forced-exit guarantees and a real DAO. But like every major L2 in 2026 it still runs a centralized sequencer, and the Security Council can act in an emergency — so it is not yet Stage 2.
Decentralized here
- L2BEAT Stage 1
- Permissionless exits + 7-day upgrade timelock
- Active Arbitrum DAO
- BoLD permissionless validation
Centralization vectors
- Centralized sequencer
- Security Council can fast-track upgrades
- Not yet Stage 2
C+Verdict
Among the most decentralized L2s — sequencer decentralization is the remaining step.
Visit Arbitrum One →
Grade as of June 2026; an opinionated synthesis of cited public metrics (Chainspect / Nakaflow (Nakamoto), L2BEAT (stages), clientdiversity.org — 2026). Figures shift — see methodology.
Compare Arbitrum One with…