Based Rollups: Delegated Sequencing as a Structural Correction for Layer 2s

Ethereum’s layer‑2 ecosystem carries a technical contradiction seldom addressed directly. Rollups are presented as scalability solutions that inherit the security of the base layer, yet most operate with a centralized sequencer that introduces a single point of trust. A sole operator decides transaction order, can censor addresses and captures the extractable value generated on the network. Users accept that architecture in exchange for fast confirmations and low fees, assuming that assets remain protected by forced‑exit mechanisms to L1. The based rollup proposal removes that trade‑off by shifting the sequencing function directly to Ethereum validators.

Optimistic and ZK rollups in production —Arbitrum, Optimism, Base, zkSync Era— depend on a sequencer node that bundles transactions, orders them and posts data to Ethereum. That node provides soft confirmations in milliseconds, but concentrates ordering power. The sequencer can extract MEV through reordering, insertion or exclusion of transactions, with no real‑time accountability mechanism. If the sequencer stops operating, the network halts from a user perspective, even though the rollup logic permits forced inclusion via L1. That forced inclusion remains slow and expensive, discouraging its use.

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