The Ethereum network continues its relentless evolution toward greater scalability, efficiency, and usability. On June 20, during the 214th All Core Devs Execution (ACDE) meeting, core developers finalized the scope of the upcoming Fusaka upgrade, adding just one new proposal—EIP-7939—bringing the total to 12 Ethereum Improvement Proposals (EIPs). This marks a pivotal shift from planning to active implementation.
As the largest hard fork since The Merge, Fusaka is widely anticipated to usher in a new era of expansion for Layer 2 (L2) ecosystems. If deployed as expected by late 2025, it could dramatically increase data capacity on L2s, driving transaction fees down over the next 1–2 years and reinforcing Ethereum’s leadership in the blockchain space.
The Ongoing Logic of Ethereum’s Roadmap
Ethereum’s long-standing challenge—scalability—has historically led to high on-chain costs and hindered mainstream DApp adoption. However, steady progress along its development roadmap has steadily addressed these bottlenecks.
According to data shared by Ethereum co-founder Vitalik Buterin in April 2025, Ethereum’s Layer 1 (L1) now supports around 15 transactions per second (TPS), with the gas limit recently increased to 36 million, a sixfold improvement over the past decade.
More impressively, Layer 2 solutions have surged ahead. Today, L2 networks collectively achieve approximately 250 TPS, with user experience and performance undergoing transformative improvements. Over the past year, average transaction fees on major rollups like Arbitrum, Optimism, and Base have dropped to under $0.01, representing reductions by multiple orders of magnitude.
This acceleration stems from Ethereum’s disciplined execution of its multi-phase roadmap:
- The Merge (2022) transitioned Ethereum to Proof-of-Stake (PoS), slashing energy consumption by over 99% and freeing up bandwidth for future upgrades.
- Dencun Upgrade (2024) introduced blob-carrying transactions (EIP-4844), enabling L2s to store transaction data off the main execution layer at drastically reduced costs.
- Pectra Upgrade (May 2025) streamlined validator operations and enhanced PoS flexibility, improving network resilience and participation.
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Now, Fusaka emerges as the next critical milestone—a comprehensive upgrade designed to amplify data throughput, reduce node overhead, and lay the foundation for mass adoption.
Inside the Fusaka Upgrade: A Technical Overview
The Fusaka upgrade integrates 12 key EIPs, spanning data availability, node efficiency, EVM enhancements, and cross-layer coordination. Together, they form a cohesive strategy to scale Ethereum without compromising decentralization or security.
EIP-7594 (PeerDAS): Revolutionizing Data Availability
The most anticipated component is EIP-7594, also known as PeerDAS (Peer Data Availability Sampling). This introduces a powerful mechanism where validators can verify blob data integrity by sampling only a small portion—eliminating the need to download or store full datasets.
This builds upon the foundation laid by EIP-4844 (Dencun upgrade), which first allowed L2 rollups to publish transaction batches into temporary "blobs" instead of bloating the main chain state. By decoupling data publication from execution, blob transactions slashed L2 costs by up to 90%.
With Pectra increasing blob capacity per block from 3 to 6, Fusaka aims to push this further—to 12–24 blobs per block initially, with a long-term vision of 72, and potentially up to 512 blobs per block once full DAS is implemented.
At peak capacity, this could enable L2 networks to process tens of thousands of TPS, unlocking viable use cases for high-frequency DeFi trading, social apps, and on-chain gaming.
Node Lightening & State Efficiency
To ensure that increased throughput doesn’t burden individual nodes, Fusaka incorporates Verkle Trees—a next-generation cryptographic structure that significantly compresses state proofs.
Unlike traditional Merkle Patricia trees, Verkle Trees allow for much smaller proof sizes, making light clients and stateless verification far more practical. This means mobile wallets, embedded devices, and edge nodes can participate in validation with minimal resources—critical for decentralization at scale.
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EVM Enhancements for Performance & Interoperability
Beyond data scaling, Fusaka boosts the capabilities of the Ethereum Virtual Machine itself:
- EIP-7939 (CLZ Opcode): Adds a "Count Leading Zeros" instruction, optimizing bitwise operations used in zero-knowledge proofs and cryptographic functions.
- EIP-7951 (secp256r1 Support): Enables native support for NIST-standardized elliptic curves commonly used in enterprise systems and Web2 identity frameworks—improving interoperability with legacy infrastructure.
- EIP-7907: Increases smart contract size limits, allowing developers to deploy more complex logic without fragmentation.
These changes collectively future-proof Ethereum for advanced applications such as AI-integrated contracts, cross-chain messaging protocols, and compliance-aware financial instruments.
Safeguards Against Network Abuse
With greater capacity comes the risk of spam or resource exhaustion. To maintain stability:
- EIP-7934 imposes soft limits on block size to prevent unbounded growth.
- EIP-7892 and EIP-7918 introduce dynamic pricing models for blob usage, adjusting fees based on demand—similar to EIP-1559 but tailored for data availability layers.
This ensures fair access while discouraging denial-of-service attacks or inefficient data publishing.
Is Fusaka the Turning Point for User Experience?
Fusaka isn’t just about raw performance—it’s about transforming how users interact with Ethereum.
For Rollup builders, lower data costs mean more room for innovation: richer application logic, faster finality, and novel consensus designs.
For wallet providers and infrastructure platforms, lighter nodes and compressed proofs enable faster sync times and broader device compatibility—making Ethereum accessible even on low-end smartphones.
End users will benefit from near-instant transactions at fractions of a cent. Imagine paying gas fees less than a penny while swapping tokens, minting NFTs, or voting in DAOs—all with reliable confirmation times.
Enterprises and regulated entities gain too: streamlined state proofs and improved EVM functionality make it easier to build auditable, compliance-ready applications that interface with traditional financial systems.
In essence, Fusaka bridges the gap between technical scalability and real-world usability—a necessary step before Ethereum can onboard billions.
Frequently Asked Questions (FAQ)
Q: What is the main goal of the Fusaka upgrade?
A: Fusaka aims to dramatically expand Ethereum’s data availability layer using PeerDAS and blob scaling, enabling L2 networks to process orders of magnitude more transactions at lower costs.
Q: When is Fusaka expected to launch?
A: While no official date is set, developers are targeting a mainnet deployment by late 2025. The upgrade is currently being tested across multiple devnets.
Q: How does Fusaka differ from Dencun?
A: Dencun introduced blob transactions (EIP-4844) to reduce L2 costs. Fusaka enhances this system with data sampling (PeerDAS), larger blob capacity, and EVM optimizations—making it a deeper and broader upgrade.
Q: Will Fusaka affect ETH holders directly?
A: Not immediately. Most benefits will be felt indirectly through cheaper L2 transactions and improved dApp performance. However, stakers may see subtle improvements in validator efficiency.
Q: Could higher throughput compromise decentralization?
A: No—Fusaka includes Verkle Trees and PeerDAS specifically to keep nodes lightweight. These technologies ensure that even with higher data volume, individual users can still run clients independently.
Q: Are there risks associated with such a large upgrade?
A: As with any major hard fork, there are testing and coordination risks. But extensive devnet trials and phased rollouts help mitigate potential issues before mainnet activation.
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The Road Ahead: Toward Mainstream Adoption
Fusaka represents more than a technical leap—it’s a strategic pivot toward mass usability. By addressing data bottlenecks, reducing operational overhead, and enhancing developer flexibility, it strengthens Ethereum’s position as the foundational layer for decentralized innovation.
When fully realized, this upgrade could mark the true inflection point where blockchain transitions from niche experimentation to everyday utility—powering everything from microtransactions and social media to global finance and digital identity.
While challenges remain in testing and coordination, the direction is clear: Ethereum is building an internet-native settlement layer capable of supporting a decentralized future for everyone.
The era of scalable, affordable, and accessible blockchain may finally be within reach—and Fusaka is lighting the path forward.
Core Keywords: Ethereum Fusaka upgrade, Layer 2 scalability, EIP-7594 PeerDAS, blob transactions, data availability sampling, Verkle Trees, EVM optimization, Ethereum 2025 roadmap