Ethereum Fusaka upgrade: Could mainnet hard fork trigger ETH rally?

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Ethereum Fusaka upgrade

What is Fusaka, and why is this upgrade so important?

This hard fork was activated on December 3 at epoch 411392. The process took around fifteen minutes and completed smoothly, with no finalization issues. Before going live, the upgrade had been thoroughly tested on the Holesky, Sepolia, and Hoodi networks.

Fusaka is a large-scale protocol upgrade focused on increasing Ethereum’s throughput and optimizing the network at the level of its core components: block structure, data processing, and interactions with Layer-2 solutions. The main idea behind the upgrade is to boost Ethereum’s efficiency without altering its economic model or introducing radical architectural changes. This is why Fusaka is often described as a “foundational upgrade”—one that does not produce instant visible effects but significantly expands the network’s long-term technical capacity.

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One of Fusaka’s most notable changes is the expansion of block capacity, increasing the amount of data that can be included in each block. This applies both to regular transactions and to blob structures used by rollup networks. Previously, limited block space led to fee spikes and processing delays, especially when Layer-2 networks submitted large batches of data for finalization. Fusaka not only expands this space but also introduces a flexible mechanism for adjusting blob parameters, allowing the network to scale gradually without repeated hard forks.

A key technical component is the introduction of PeerDAS — a data availability sampling mechanism. Previously, every node had to download full segments of data to ensure that none of it was withheld or removed. PeerDAS allows nodes to verify only random parts of the data instead, drastically reducing bandwidth requirements and disk usage. This brings Ethereum closer to true sharding and makes running validator nodes significantly more accessible and cost-efficient.

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Additional improvements were also made to the Ethereum Virtual Machine and cryptographic libraries, including support for P-256 — a signature scheme widely used in modern authentication protocols. This opens the door to new types of wallets and password-less login systems, creating a technological foundation for mainstream Ethereum adoption. In the long term, interactions with Ethereum may begin to feel as seamless as Apple Pay or Google Passkeys.

Could Fusaka trigger a mega rally for ETH?

The changes introduced by Fusaka are not immediate — this is not a “boost ETH price” button. Instead, the effects accumulate gradually. Rollups now have more room to operate, meaning fees should decrease over time. The network will be able to handle higher traffic, and congestion during peak activity will become less common. PeerDAS will expand decentralization by making it easier than ever to run a node.

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Market sentiment also reflects increasing interest in ETH following the upgrade. Analysts on social media already suggest that Fusaka could be an underrated catalyst for the fourth quarter. Historically, the market sometimes reacts with a delay to such “quiet but foundational” improvements. Pectra has already provided a strong example — a +58% rally after activation.

Fusaka does not make ETH deflationary, nor does it introduce any magical new features that would instantly push the price upward. But it creates the groundwork for long-term growth — a cheaper, more scalable, more reliable Ethereum that can support millions of new users.

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