Centralization of L2 Rollup Sequencers: Challenges and Possibilities
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Centralization of L2 Rollup Sequencers: Challenges and Possibilities
Every single Layer 2 Rollup on Ethereum uses centralized sequencers.
Navigating Web3 tides with focused insightsWritten by: DARREN KLEINE
Compiled by: TechFlow
Centralization is the dreaded enemy of freedom and progress in the realm of distributed ledger technology. Whenever developers encounter scalability challenges, it often becomes the prime target of criticism.
Ironically, within decentralized protocols, the fastest path from point A to point B usually involves some form of centralization. Developers may sacrifice ideals like censorship resistance and autonomy simply to make things fast and cheap.
Stephane Gosselin says that while the pursuit of further decentralization in blockchain continues, for certain components, centralization might not be such a bad thing after all.
Gosselin, co-founder and chief architect at Flashbots and founder of Frontier Research, discussed Layer 2 rollups on the Bell Curve podcast, arguing that centralized sequencers may not be as problematic as many fear.
All Rollup Sequencers Are Centralized
First, let's clarify one fact: Every single Layer 2 rollup on Ethereum—without exception—uses a centralized sequencer.
A sequencer’s job is to process and order transactions into blocks added to the blockchain. For rollup providers, maintaining their own proprietary centralized sequencer system is cheaper, faster, and easier than outsourcing this function.
"I still don't believe this is necessarily a bad thing," said Gosselin. "I don't think having first-in-first-out (FIFO) sequencers on Layer 2 is a deal-breaker."
According to Gosselin, the usual argument against centralized rollups is that they create a “latency game,” drawing centralization toward specific locations. This concentration, he says, makes rollups vulnerable to censorship and restrictive regulation regardless of where they are deployed.
"But the question remains: Is this really a bad thing?"
Gosselin believes Ethereum was designed to have a maximally decentralized Layer 1 with relatively little economic activity occurring directly on base layer. Its purpose is to settle data without what he describes as "contestation"—the requirement to settle at a specific location—which instead occurs internally within Layer 2.
"If you have an architecture where Layer 1 only settles data blobs, and all activity happens inside Layer 2, that significantly reduces centralization pressure on Layer 1."
Cross-Chain Messaging
Gosselin says cross-chain messaging can come to the rescue, providing censorship resistance between layers when needed. "You have some way to push messages back from Layer 2 to Layer 1."
Through message mechanisms like IBC, Gosselin says Layer 2s can remain censorship-resistant and non-custodial, because individual rollup participants can "exit their state and bridge it to some other rollup in a different jurisdiction."
Host Mike Ippolito pointed out that users would face significant "market disruption" in such a scenario.
"For a period of time, we'd have to move assets and everything onto the main chain, then back up onto another rollup."
Ippolito noted that the threat of potential disruptions could "prevent TVL and activity from migrating onto rollups."
Gosselin agreed, pointing out: "Another argument is that if you have a mechanism allowing states to exit back to Layer 1," he said, "then you're going to have a lot of contention on Layer 1."
"So you face exactly the same centralization pressures on Layer 1," he added.
Gosselin acknowledged: "Ultimately, you’re making trade-offs across these different execution environments, but in the end, application developers just want an interface they can plug into and automatically deploy their services."
"Shared sequencers, decentralized block builders, cross-chain bridges—they’re all trying to build and provide these services," he said. "There are many different ways to construct them, but it's still unclear where this will ultimately lead."
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