Ethereum Fusaka Hard Fork: A Major Leap Towards Scalability and Cost Efficiency

Ethereum is gearing up for a significant upgrade known as the Fusaka Hard Fork, scheduled for launch on December 3, 2025. This upgrade aims to enhance scalability, improve security, and reduce overall transaction costs on the Ethereum network.

Key highlights of the Fusaka Hard Fork include the introduction of 12 new Ethereum Improvement Proposals (EIPs) designed to optimize network performance. A core feature is the implementation of blob capacity, a novel approach that stores large datasets off-chain to increase layer-2 efficiency and cut down on transaction costs. The initial maximum blob count will be set at 15 for the first stage (BPO1) and increased to 21 in the second stage (BPO2).

The blob capacity is set to double in two phases following the mainnet launch — first on December 17, 2025, and then once again on January 7, 2026. This incremental ramp-up supports smoother network scaling and better data handling.

Ethereum’s commitment to reliability is evident with three public testnets planned between early October and mid-November 2025 to thoroughly test this upgrade before it goes live. This upgrade continues the network’s evolution after the Pectra upgrade rolled out on May 7, 2025.

To further secure the network, the Ethereum Foundation has announced a $2 million code audit program inviting developers and security researchers to identify vulnerabilities in the Fusaka codebase.

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Stay tuned for more updates on the Ethereum Fusaka Hard Fork and how it continues to drive forward the blockchain ecosystem.