Risks of Base sequencer centralization

Liveness failure and single points of failure

A single faulty block stopped Base block production for over an hour on June 25, 2026. This stoppage froze deposits, withdrawals, and all on-chain activity. The network reported unhealthy block production at 16:03 UTC, and a diagnosis at 16:52 UTC identified a problematic block that interfered with subsequent block building. This incident occurred two hours before the scheduled Beryl network upgrade. In August 2025, the chain halted for 33 minutes because of a sequencer problem. Coinbase engineers restored service by manually handing leadership to a healthy sequencer.

One operator controls the chain.

Liveness failures represent the most immediate threat to rollup stability. When the sequencer operator goes offline, the entire rollup stops processing transactions, which means that DeFi protocols freeze, positions cannot be managed, and users must rely on the much slower process of submitting transactions directly to Ethereum L1. While users can bypass the sequencer by submitting to L1, the process is slower and more expensive. For anyone using the chain as a payment rail, availability decides whether a balance is spendable. This structural dependency remains a problem for all chains with single operators, as seen during the five-and-a-half-hour Arbitrum sequencer outage in 2022.

Censorship and MEV extraction

Centralized sequencers allow an operator to exclude or reorder transactions. A single entity controls the mempool and decides which trades to include. This setup creates censorship risk and enables MEV extraction. In June 2024, Linea paused its sequencer for approximately one hour to censor attacker addresses following a $6.8 million Velocore DEX exploit.

The chain simply stopped.

This visibility allows the operator to capture arbitrage or front-run large orders. The operator sets the policy for whether they use a first come first served model or an auction. Do you trust a single company to manage your transaction priority? Regulatory frameworks like the U.S. BSA could classify sequencer operators as money transmitters, which imposes KYC and reporting requirements. The lack of external auditors monitoring the mempool in real time creates a trust gap. This allows a single controlling entity to influence outcomes before settlement.

The path to decentralization

Base reached Stage 1 in April 2025 with permissionless fault proofs. The Base Security Council contains 11 independent entities and individuals. To approve network upgrades, nine of 12 parties must agree. This structure distributes some authority, but the sequencer remains centralized under Coinbase.

Base holds billions.

The network records approximately 1.5 million daily active addresses. It generated $75 million in sequencer revenue through 2025 and was the only profitable L2 in 2025. The network processes over 4 million daily transactions on multiple occasions in early 2026. While Arbitrum operates a sequencer through Offchain Labs and has reached Stage 1, Base remains in a different stage of the decentralization roadmap. Optimism also operates a single centralized sequencer run by the Optimism Foundation. Base, Arbitrum, and Optimism process nearly 90% of all Layer 2 transactions. Full decentralization for these networks remains a long-term goal. The centralization of the sequencer is a fundamental design choice.