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Fusaka Is Coming: What Ethereum’s Next Major Upgrade Brings

Ethereum’s next upgrade, Fusaka, is planned for Q4 2025. It will update both the execution and consensus layers, focusing on scaling data capacity, improving network security, and giving developers better tools. Fusaka follows earlier milestones like The Merge, Shanghai, and Dencun, continuing Ethereum’s effort to make the network more efficient and resilient.

Ethereum 101

Why Is It So Important?

Fusaka matters because it helps Ethereum handle more activity without slowing down or overloading the network. By changing how data is stored and priced, it allows Ethereum to scale for growing Layer 2 use while keeping hardware and costs manageable. The upgrade also adds safeguards against spam and system overload, ensuring the network stays stable and secure as it grows.

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PeerDAS: A New Way to Handle Data
The main technical change in Fusaka is PeerDAS, short for data availability sampling. Right now, every Ethereum node has to store all blob data. PeerDAS changes that. Each node will only keep a small random portion, and the network can still confirm that the full data exists using cryptographic sampling.
This approach could increase blob throughput by roughly eight times without adding more load on node operators.

Speaking of Blob
Blobs are the temporary data packages introduced in Dencun. With this upgrade, they are getting a few updates:

These changes aim to keep blob usage fair and adaptable as demand from Layer 2 networks grows.

Strengthening Network Protections
Fusaka includes several changes to limit denial-of-service risks. New EIPs cap input sizes, block sizes, and gas limits to prevent heavy transactions from slowing or disrupting the network. These adjustments make Ethereum more stable under high demand.

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