ETH Finalises Fusaka Update
ETH has finalised and activated its Fusaka update, marking one of the network’s most significant technical milestones of 2025. The upgrade focuses on dramatically expanding data capacity for Layer-2 rollups, improving fee efficiency, and strengthening protocol-level security — all critical steps as ETH faces stiff competition from quicker, cheaper Layer-1 alternatives. Fusaka is not a flashy overhaul, but a foundational upgrade designed to ensure ETH can scale to meet rising global demand for on-chain activity.
How Fusaka Supercharges ETH’s Data and Scaling Stack
The headline feature of Fusaka is PeerDAS (Peer Data Availability Sampling), a breakthrough mechanism that increases the volume of “blob” data ETH can securely process. Blobs — temporary data objects introduced in earlier updates — allow rollups to post transaction data to ETH without congesting the main chain. Fusaka expands blob capacity by up to eight times, enabling rollups to support significantly higher throughput at far lower costs.
This is essential for DeFi protocols, decentralized platforms, gaming platforms, and other applications that rely on high-speed, low-cost transactions. By increasing available data bandwidth, Fusaka reduces average transaction fees across leading Layer-2 networks and lays the groundwork for more complex real-time on-chain applications.
Fusaka also brings refinements to gas accounting, block construction, and Block confirmer coordination. These improvements assist rollups write to ETH more predictably and efficiently, lowering operational friction for developers and infrastructure providers. Over time, the upgrade aims to make Layer-2 networks more stable, more scalable, and more aligned with ETH’s long-term modular design philosophy.
What Fusaka Means for Users, Developers, and ETH’s Competitive Edge
For everyday users, the most visible impact will be lower transaction fees and quicker processing times on major Layer-2 networks like Arbitrum, Optimism, Base, and zkSync. While mainnet activity may not change dramatically in the short term, the improved economics of rollups could expand usage across decentralized applications that previously struggled with cost volatility.
Developers benefit from more predictable fee markets and a clearer capacity roadmap. With Fusaka, there is greater confidence that the network can sustain higher throughput without compromising security. This encourages long-term infrastructure investments and reinforces ETH’s role as the settlement layer of choice for institutional-grade applications.
From a competitive standpoint, the upgrade assists ETH defend its position against high-performance Layer-1 ecosystems touting raw speed and low costs. Instead of trying to match monolithic blockchains directly, ETH is doubling down on modular scalability — pairing a secure base layer with quick, efficient rollups. If Fusaka delivers on its promises, it will strengthen the argument that ETH’s layered architecture is both scalable and sustainable.
Ultimately, Fusaka is not about short-term hype. It is about reinforcing ETH’s foundation so the network can handle the next era of growth — from tokenised assets and DeFi to gaming, social apps, and real-world financial infrastructure. With this upgrade, ETH signals that it is building for a future in which millions of users interact with the network daily, without ever worrying about congestion or soaring fees.
