Ethereum’s scaling roadmap has long revolved around one central challenge: how to increase throughput and reduce transaction costs without sacrificing the security guarantees of the base chain. Rollups have become the dominant answer to that problem, but the design space is still evolving. Among the newer ideas gaining attention is the concept of based rollups, a model that shifts transaction sequencing back to Ethereum Layer 1 rather than leaving it in the hands of dedicated Layer 2 sequencers.
The source material frames the discussion within a broader debate about Ethereum’s future, touching on market frustrations, Vitalik Buterin’s public stance on rollup maturity, and the constant iteration taking place across the Layer 2 ecosystem. At the center of the article, however, is a technical thesis: based rollups could represent a meaningful next step in Ethereum scaling by reducing complexity and improving decentralization at the sequencing layer.
Why Rollups Matter for Ethereum
Ethereum’s mainnet has historically struggled with high fees and limited capacity during periods of heavy demand. That pressure created the need for Layer 2 systems capable of handling execution more efficiently while still inheriting Ethereum’s security for settlement and data availability. Rollups emerged as one of the most promising approaches because they batch transactions off the base chain and submit the bundled data back to Layer 1.
Two rollup categories dominate the current landscape: optimistic rollups and zero-knowledge rollups. Both improve scalability by moving execution away from the base layer, but they differ in how they verify correctness.
Optimistic rollups assume transactions are valid by default and rely on fraud proofs to challenge invalid state transitions. This model reduces computational burdens on Layer 1, but it introduces tradeoffs such as withdrawal delays because the system must allow time for disputes to be raised. Zero-knowledge rollups, by contrast, use cryptographic validity proofs such as SNARKs or STARKs to show that bundled transactions were processed correctly. That can significantly improve finality and throughput, but the underlying proving systems are more complex.
Despite their differences, both approaches have shared pain points. The article highlights concerns around sequencing, especially where a single operator or a narrow set of actors determines transaction ordering. Those concerns matter because they can affect decentralization, create downtime risk, and raise censorship questions.
What Makes a Rollup “Based”
The defining feature of a based rollup is not execution, settlement, or fraud-proof logic alone. Its core distinction is where sequencing happens. According to the article, the idea was brought forward by Ethereum researcher Justin Drake in March 2023 as a way to address some of the structural issues present in existing rollup models.
In a based rollup design, transaction sequencing is performed using Ethereum’s own Layer 1 infrastructure. Rather than relying on a separate rollup-specific sequencer, the system leuses the actors already involved in Ethereum block production, including searchers, builders, and proposers. This is meant to make sequencing more decentralized, more reliable, and more aligned with the base chain’s security assumptions.
The article emphasizes that this approach could expand participation because anyone with visibility into the rollup mempool may be able to engage in the sequencing process without special permission. In theory, that makes the system less dependent on proprietary infrastructure or tokenized operational frameworks and more integrated with Ethereum’s existing market structure.
Architecture and Transaction Flow
Based rollups are presented as having four layers: the consensus layer, data availability layer, execution layer, and settlement layer. Of those, the article says the consensus, data availability, and settlement layers all come from Ethereum Layer 1, while the execution layer remains the responsibility of the rollup itself.
That division is important because it shows how deeply based rollups are anchored to Ethereum. The rollup does not attempt to replace core base-layer functions. Instead, it keeps execution specialized while leaning on Layer 1 for the most security-sensitive and coordination-heavy components.
The transaction lifecycle described in the article unfolds across four steps. First, Layer 2 searchers bundle user transactions from the rollup. Second, Layer 1 searchers and Layer 2 builders collaborate to order those transactions into full Layer 2 blocks. Third, the Layer 1 searchers submit those complete Layer 2 blocks to Layer 1 block builders. Finally, Layer 1 builders include the relevant Layer 2 data inside Layer 1 blocks, which Ethereum validators then process like any other on-chain transaction.
This collaborative structure is one of the most notable departures from traditional rollup sequencing. Rather than using an isolated operator, based rollups attempt to merge Layer 2 ordering into the existing Ethereum block production pipeline. The result, according to the article, is a permissionless system in which rollup blocks can be inserted into Layer 1 blocks without requiring bespoke authorization.
The Case for Better Decentralization and Simplicity
The strongest argument in favor of based rollups is that they improve decentralization at the sequencing layer. By using Ethereum’s underlying infrastructure, they reduce reliance on dedicated sequencer entities that may become chokepoints for censorship or operational failure. If sequencing is distributed through the base layer’s open market structure, the rollup may inherit stronger neutrality and uptime properties.
The article also argues that based rollups could reduce implementation complexity. Because they depend on existing Layer 1 actors rather than custom sequencing networks, they may avoid some of the engineering overhead associated with designing and maintaining separate consensus-like systems for transaction ordering.
Cost efficiency is another point raised in the source. Based rollups are described as potentially lowering expenses by removing gas overhead tied to sequencer signature verification and certain contract verification steps. Combined with the possibility of a more streamlined design, that could make the user experience cheaper while reducing the burden on rollup builders.
In practical terms, the pitch is straightforward: more decentralization, lower complexity, reduced downtime risk, and potentially lower costs, all while maintaining Ethereum-native security assumptions.
Pre-Confirmations and User Experience
Another notable feature highlighted in the article is the use of pre-confirmations. These allow transactions to receive an earlier assurance before final on-chain inclusion. For users, that can materially improve the experience because they no longer have to wait as long to feel confident that a transaction will complete.
The model described in the source requires proposers to accept stronger slashing conditions in exchange for offering these pre-confirmations. If a proposer fails to honor a promise made in the pre-confirmation process and does not ensure the transaction is included on-chain as expected, that proposer could face higher penalties.
This creates a stronger incentive structure around rapid and credible transaction assurance. While the article does not claim that pre-confirmations eliminate all execution risk, it presents them as an important usability upgrade that can make based rollups feel faster from the end user’s perspective.
The Tradeoffs: MEV and Loss of Flexibility
The article is careful not to present based rollups as a universal solution. It outlines several disadvantages that may limit adoption or force design compromises. One of the biggest is economic: if sequencing happens on Layer 1, then the rollup itself may lose access to the maximal extractable value (MEV) revenue that might otherwise accrue to a proprietary sequencer. In that model, the value generated by transaction ordering is captured more directly by the base layer.
For rollup operators, that is not a trivial issue. Sequencer economics can be an important part of a project’s long-term business model. Giving that up in exchange for decentralization may be acceptable to some builders, but not to all.
The other major limitation is flexibility. A rollup with its own sequencer can optimize ordering logic, latency targets, and execution pathways to suit specific applications. A based rollup, by contrast, is more constrained by the rules and cadence of the Layer 1 it depends on. As the article puts it, the sequencing process and a portion of the scalability profile remain at the mercy of Ethereum itself.
That means based rollups may be simpler and more decentralized, but they are also less sovereign. Builders who want full control over sequencing design may see that as a meaningful drawback.
Vitalik’s Stage 1 Focus and the Competitive Landscape
The article also connects based rollups to the wider conversation about rollup maturity. It references Vitalik Buterin’s public position that, going forward, he plans to focus his public mentions on Layer 2 projects that have reached stage 1+, with only limited flexibility for new and genuinely interesting exceptions. That statement reflects a growing emphasis on security, reduced trust assumptions, and clearer paths away from centralized “training wheels.”
Within that framework, the source notes that the current rollup market is still led by optimistic rollups and that only Arbitrum and Optimism have made the stage 1 cut mentioned in the article. Based rollups therefore enter a market where scale is already being achieved, but where concerns about decentralization and sequencing architecture remain unresolved.
The suggestion is not that based rollups replace optimistic or ZK rollups outright. Instead, they offer a different design point: one that borrows from established rollup mechanics while trying to improve decentralization and simplify sequencing through deeper integration with Ethereum Layer 1.
Projects Exploring the Model
To illustrate that the concept is moving beyond theory, the article points to a group of projects experimenting in the space, including Taiko, Espresso, Fairblock, Sorella, and Chainbound. It does not provide implementation details for each, but their inclusion signals that based rollups are becoming an active area of exploration rather than a purely academic idea.
That matters because Ethereum scaling debates often shift quickly from research to production. A design can sound compelling in principle, but only live deployments reveal how it handles real-world transaction flows, incentive alignment, and adversarial behavior. The next phase for based rollups will likely depend on whether these builders can translate the model into systems that are performant, economically sustainable, and attractive to developers.
Final Takeaway
Based rollups are best understood as an attempt to rebalance the tradeoffs in Ethereum scaling. Instead of maximizing rollup sovereignty, they seek to maximize alignment with Ethereum’s base-layer infrastructure. By moving sequencing to Layer 1, they aim to improve decentralization, reliability, simplicity, and potentially user costs. But in return, they accept reduced flexibility and weaker direct capture of sequencing-related revenue.
That does not make them better in every context, nor does it guarantee they will dominate the Layer 2 market. It does, however, make them one of the more important emerging ideas in the current scaling conversation. As Ethereum’s Layer 2 ecosystem matures and scrutiny around security and decentralization intensifies, based rollups may become a serious contender in the next chapter of the network’s expansion.