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On December 3, 2025, Ethereum activated the Fusaka hard fork on mainnet, its second major network upgrade of 2025 after Pectra. Fusaka continues Ethereum’s roadmap toward a highly scalable, rollup-centric ecosystem, focusing on cheaper transactions and better support for Layer 2 (L2) networks.
The core idea behind Fusaka is to dramatically expand data availability for L2 rollups while lowering the hardware burden on validators. The headline feature is Peer Data Availability Sampling (PeerDAS), a technique that lets nodes verify only small samples of the posted data instead of downloading everything. This keeps the network decentralized while still increasing total data capacity, which is crucial for rollups that depend on Ethereum for posting transaction batches.
Alongside PeerDAS, Fusaka introduces a set of Ethereum Improvement Proposals (EIPs) that tweak gas limits, fee mechanics and node efficiency. Sources highlight a higher effective gas limit (often summarized around 150 million gas per block) and improvements to how Ethereum handles so-called “blobs” of rollup data. The combination is designed to make L2s like Arbitrum, Optimism and zk-rollups faster and cheaper, especially during times of heavy demand.
Fusaka also prepares the ground for future upgrades by improving compatibility with existing wallets and Web2-style authentication. Some EIPs aim to make it easier for mainstream users to interact with Ethereum applications without complicated key management, continuing a trend already started with the earlier Pectra upgrade in May 2025, which focused more on staking, account abstraction and general UX.
For everyday users, the Fusaka upgrade should translate into lower average fees and smoother L2 usage over time, rather than a dramatic overnight change. For developers and infrastructure providers, it signals that Ethereum is committed to a twice-a-year upgrade cadence and a modular design where execution, consensus and data availability are increasingly specialized. In short, Fusaka is another step toward an Ethereum that can scale to billions of users without sacrificing decentralization or security.
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Qu'est-ce que Binance Futures et comment ça marche
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