Why does every rollup I use still hand transaction ordering to one operator?
Opportunity
Every major L2 today, including Arbitrum, Base, OP Mainnet, and zkSync, routes all transactions through a sequencer run by a single organization. That operator decides the order transactions execute, can censor individual addresses, and pockets sequencer MEV with no meaningful accountability to users. Over $700M in MEV has been extracted from Arbitrum and Optimism alone. Shared sequencer designs like Espresso Systems exist as research and early testnets, but as of April 2026 none has shipped to a production mainnet L2. The decentralization roadmap keeps slipping to the next release cycle.
Why it matters
A sequencer with unilateral ordering power is a censorship chokepoint and a regulatory target that undermines each rollup's claim to being neutral infrastructure.
How I score the opportunity
The Opportunity Score is my own read, not a measurement: how much it hurts, how often it bites, and how little exists to solve it today. Higher means I think it is more worth building.
How much pain it causes when it shows up.
How often people actually run into it.
How little good tooling exists for it today.
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