Ethereum scaling enters the zk era: How is Taiko driving the evolution of decentralized Rollups?

In 2026, Ethereum's scaling narrative has completed the critical leap from "theoretical validation" to "engineering implementation." Ethereum has officially transformed from a congested smart contract platform into a modular settlement layer, supporting the operation of a multi-Rollup economy. The core driving force behind this shift is zero-knowledge proof technology moving from academic frontiers to production-grade infrastructure—ZK Rollup is no longer just an option on the scaling roadmap but is becoming the default execution paradigm for Layer 2.

Against this backdrop, Taiko, as the first representative project on Ethereum based on a Based Rollup, offers a highly valuable sample for understanding the evolution of Rollups in the ZK era through its unique decentralized architecture and technical roadmap. Starting from the underlying logic of modular blockchain, it sorts out the path of ZK technology mainstreaming, analyzes the competitive landscape of the Layer 2 ecosystem, and evaluates Taiko's position and challenges in the evolution of decentralized Rollups.

Modular Blockchain: The Underlying Logic of Ethereum Scaling

Ethereum's long-term vision revolves around modularity: the execution layer shifts to Layer 2 Rollups, settlement and consensus are guaranteed by Layer 1, and data availability is optimized through Blobs and DAS (Data Availability Sampling). The essence of this architecture is to decouple the four core functions of blockchain—consensus, data availability, settlement, and execution—into independent modules, each performing its own role and combining as needed.

By 2026, this modular thesis has moved from theory to reality. Ethereum continuously strengthened Layer 1 data availability capabilities through the Pectra upgrade (May 2025) and the Fusaka upgrade (December 2025). The Pectra upgrade increased the target number of Blobs from 3 to 6, while the Fusaka upgrade introduced PeerDAS (Peer-to-Peer Data Availability Sampling), enabling more efficient data availability for Rollups. The upcoming Glamsterdam upgrade, expected in the second half of 2026, will further introduce a built-in proposer-builder separation (ePBS) mechanism, helping Layer 1 expand its processing capacity.

The cumulative effect of this series of upgrades is that Ethereum's Layer 1 is transforming into a "global settlement court"—evolving slowly, extremely secure, and economically strengthened through Layer 2 usage. The modular architecture allows Ethereum to scale horizontally through a range of specialized Rollups, rather than requiring Layer 1 to scale vertically. This layered decoupling design not only significantly reduces the development and operational costs of the public chain but also enables Ethereum to accommodate diverse scaling needs from DeFi, RWA (Real World Assets), on-chain gaming, and other scenarios while maintaining decentralization and security.

In this architecture, Rollups assume the execution functions originally belonging to Layer 1, and ZK Rollup, with its cryptographic finality advantage, is becoming the mainstream choice for the execution layer.

ZK Rollup Mainstreaming: From Technical Narrative to Production Infrastructure

In 2026, the evolution path of ZK Rollup is clearly divided into two stages: technical maturity and ecosystem diffusion.

On the technical side, the most landmark event is the completion of the Type 1 EVM equivalence upgrade by Polygon zkEVM in May 2026. According to Vitalik Buterin's four-level classification of zkEVM, Type 1 represents a fully equivalent execution environment to Ethereum Layer 1, covering all opcodes, precompiled contracts, state tree structures, and block formats. Prior to this, mainstream ZK Rollup solutions, including zkSync Era, had long remained at the Type 3 level, with some complex smart contracts relying on edge opcodes or EVM underlying Assembly facing implicit compatibility risks during deployment.

The technical foundation for Polygon zkEVM's Type 1 breakthrough comes from the Plonky3 proof system and recursive aggregation scheme, combined with dedicated ASIC and FPGA hardware acceleration clusters. The proof generation time for a single block has been compressed to approximately 2.3 seconds, a 12-fold reduction compared to two years ago. The industry significance of this breakthrough lies in the fact that the competition between ZK Rollup and Optimistic Rollup has entered the same baseline for the first time—both sides have solved compatibility issues, and the remaining competition centers entirely on security models, fee structures, and ecosystem appeal.

On the ecosystem side, ZK Rollup is evolving from a scaling tool to a value settlement layer. With its instant finality and stronger privacy, ZK Rollup has become the preferred scaling solution for commercial scenarios such as DeFi, RWA, and on-chain gaming. ZK cross-chain technology is reshaping interoperability security—ZK-SNARK cross-chain bridges replace traditional multi-signature schemes, reducing cross-chain attack risks by 99%. Vitalik Buterin pointed out in early 2026 that the timeline for Ethereum to fully embrace ZK at the Layer 1 level is gradually aligning with the actual progress of introducing native Rollup precompiles.

ZK Rollup is no longer just a temporary solution to Ethereum's scaling problems. The execution layer in 2026 is integrating around provable systems. The real question is no longer whether ZK is important, but how quickly it will become the default option.

Layer 2 Ecosystem Competitive Landscape: Integration and Differentiation in Parallel

While ZK Rollup technology matures, the market structure of the Layer 2 ecosystem is showing a high degree of integration.

Market concentration continues to rise. Data shows that the top five Layer 2s—Base, Arbitrum, Optimism, zkSync, and Starknet—have captured over 85% of market share. Base, Arbitrum, and Optimism together handle nearly 90% of Layer 2 transaction volume. In the DeFi sector, Base and Arbitrum control over 80% of total Layer 2 DeFi TVL. Arbitrum remains the leader in DeFi liquidity, holding approximately 38% of the Layer 2 DeFi share; Base dominates in consumer, gaming, and social verticals.

Technical route competition enters a new phase. Optimistic Rollup still dominates in DeFi liquidity and user adoption due to developer familiarity and tooling maturity. But ZK Rollup is rapidly closing the gap. The realization of Type 1 EVM equivalence undermines the core argument of "full compatibility" that Optimistic Rollup has long relied on. The logic for developers choosing a Layer 2 is shifting from a binary trade-off of "compatibility vs. finality" to a three-dimensional comparison of "fees + ecosystem tools + liquidity depth."

Functional specialization becomes a differentiation path. The current Layer 2 ecosystem is not simply fragmented but functionally specialized. Arbitrum focuses on DeFi liquidity, Base deepens consumer applications and social scenarios, and Optimism promotes infrastructure coordination through the Superchain model. This specialization means that Layer 2 competition is no longer just about technical parameters but a comprehensive contest of ecosystem positioning and value capture capabilities.

In this landscape, the challenges for new entrants are extremely severe. Over 50 Layer 2 networks are competing for users, liquidity, and developers. Market data confirms the integration trend: transaction activity and value are rapidly concentrating among the top players. For emerging projects like Taiko, finding a differentiated position in a highly concentrated market is a key determinant of long-term viability.

Taiko's Technical Path: A Practical Example of Decentralized Rollup

Against the backdrop of a highly integrated Layer 2 ecosystem, Taiko has chosen a technical path distinctly different from mainstream Rollup projects—the Based Rollup.

The core design philosophy of Based Rollup is to return transaction sequencing rights to Ethereum Layer 1 validators, rather than being controlled by a centralized sequencer. Most current mainstream Rollup solutions rely on centralized sequencers, creating single points of failure and facing risks of censorship, transaction manipulation, and systemic issues. The solution proposed in Taiko's Alethia whitepaper is to restore sequencing functionality to Ethereum's native validators—this is not just a technical choice but an ideological declaration about decentralization.

In terms of technical architecture, Taiko introduces two proof system frameworks: Based Contestable Rollup (BCR) and Based Booster Rollup (BBR). BCR enhances decentralization by allowing participants to challenge the validity of transactions when they suspect fraud; BBR reduces developer workload and redeployment costs by sharding transaction execution and storage. Taiko adopts multiple proof systems within BCR, including SGX, ZK, SGX+ZK, and other Rollup proof schemes at different stages, ensuring system flexibility and operational stability.

Recent key developments include: On April 9, 2026, Taiko deployed the Shasta upgrade on mainnet—a complete protocol rewrite that reduces the cost of proposing blocks by approximately 22 times and proof costs by about 8 times. According to the official roadmap, full decentralized pre-confirmation is achieved in Q1 2026, sub-second pre-confirmation latency in Q2, and progression to Stage 2 Rollup classification. Additionally, the Ethereum Name Service (ENS) has announced it will use the Taiko tech stack to build Namechain—a fully ZK-based Rollup planned to launch its testnet in Q2 2026. This collaboration marks significant recognition of Based Rollup as a viable scaling solution aligned with Ethereum's values.

But challenges cannot be ignored. On June 21, 2026, the Taiko network experienced a security vulnerability incident, after which the team implemented a four-step recovery plan. As of June 30, the network resumed operation, cross-chain assets achieved 1:1 matching, and user assets suffered no loss. On July 2, the cross-chain bridge service fully resumed. This incident reminds the market that even Rollup solutions designed with more decentralized architectures still need to undergo practical testing in terms of security and operational stability.

In terms of market performance, as of July 3, 2026 (Beijing time), according to Gate data, the price of Taiko (TAIKO) was $0.13436, with a 24-hour change of -75.05%, a 7-day change of +111.36%, a 30-day change of +39.27%, a market cap of approximately $26.8219 million, a 24-hour trading volume of approximately $11.6066 million, and neutral market sentiment. The sharp price volatility reflects significant market divergence between Taiko's technological prospects and short-term risks.

Conclusion

Ethereum scaling is entering a new phase defined by ZK technology. The modular architecture has moved from blueprint to reality, ZK Rollup has evolved from technical narrative to production-grade infrastructure, and the Layer 2 ecosystem is undergoing high integration while moving toward functional specialization. In this macro context, Taiko's Based Rollup path offers a unique perspective—it attempts to find a new balance between Ethereum's core value of decentralization and scaling efficiency.

However, a "great cleansing" of the Layer 2 ecosystem is underway. In a landscape where top projects have captured over 85% of market share, technical uniqueness does not automatically translate into market competitiveness. Taiko must continuously prove its value across multiple dimensions, including proof costs, ecosystem appeal, and security track record. The ZK era indeed brings new technical possibilities for Rollups, but who will ultimately prevail in this round of competition depends on execution—not vision.

FAQ

Q: What is a Based Rollup? How is it different from traditional Rollups?

A Based Rollup returns transaction sequencing rights to Ethereum Layer 1 validators, rather than being controlled by a centralized sequencer. This design eliminates the single point of failure and censorship risks posed by centralized sequencers, aligning the Rollup's decentralization level with Ethereum's mainnet. Traditional Rollups rely on centralized sequencers operated by the project team.

Q: Why did ZK Rollup become mainstream on Layer 2 in 2026?

ZK Rollup offers instant finality and stronger privacy, making it the preferred scaling solution for commercial scenarios such as DeFi, RWA, and on-chain gaming. In May 2026, Polygon zkEVM completed its Type 1 EVM equivalence upgrade, solving long-standing compatibility issues and bringing ZK Rollup and Optimistic Rollup competition onto the same baseline.

Q: What substantive changes did Taiko's Shasta upgrade bring?

The Shasta upgrade was deployed on mainnet on April 9, 2026, and represented a complete protocol rewrite. After the upgrade, the cost of proposing blocks was reduced by approximately 22 times, and proof costs by about 8 times, significantly lowering the operational costs of the Taiko network.

Q: What is the current market concentration in the Layer 2 ecosystem?

The top five Layer 2s—Base, Arbitrum, Optimism, zkSync, and Starknet—hold over 85% market share. Base, Arbitrum, and Optimism together handle nearly 90% of Layer 2 transaction volume. Base and Arbitrum control over 80% of total Layer 2 DeFi TVL.

Q: What is the significance of modular blockchain for Ethereum scaling?

The modular architecture decouples the four core functions of blockchain—consensus, data availability, settlement, and execution—into independent modules. Through this architecture, Ethereum shifts the execution layer to Layer 2 Rollups, while Layer 1 focuses on security, consensus, and data availability. This design allows Ethereum to scale horizontally through specialized Rollups, rather than requiring Layer 1 to scale vertically.