# Rollup Reliability Exposes Sequencer Centralization

As economic activity concentrates on a few Ethereum layer-2 networks run by single sequencers, outages and pause powers recur as a structural risk, pushing decentralization of ordering from a slogan toward a hard requirement.

- Conviction: 26 / 100 (weakening)
- 7-day move: -14
- Horizon: Emerging (watchlist)
- Tracking since: 2026-06-26T00:00:00.000Z
- Last updated: 2026-07-07T14:00:01.950Z
- Canonical: https://polylog.news/crypto/trends/l2-sequencer-centralization-risk
- Publisher: Polylog
- Affected regions: Global

## Recent score history

- 2026-07-06: 28
- 2026-07-07: 26

## Recent evidence

- [confirms] Base Traces Two Outages to a Single Sequencer Bug, Reviving Centralization Concerns (2026-06-28): Coinbase's Base layer-2 stopped producing blocks twice in two days, traced to a single sequencer bug, underscoring rollups' reliance on one operator to order transactions.
- [confirms] Base Stops for Two Hours After a Consensus Bug, Testing How Decentralized Ethereum's Largest Rollups Really Are (2026-06-26): Coinbase's Base halted block production for ~2 hours after a single invalid block, exposing its reliance on one sequencer; reported across crypto outlets covering the consensus bug.