Ethereum Fusaka Upgrade December 3, 2025: Impacts and Changes to Know

Ethereum is ready to launch a major upgrade on December 3, 2025, known as Fusaka.This upgrade is an important step in Ethereum's broader roadmap to increase the scale and efficiency of the network, as well as significantly lower transaction costs.

If you're an Ethereum user or planning to get more involved in the crypto world, understanding Fusaka is crucial. This article will fully explore the impact of the upgrade.Fusaka on Ethereum and the changes you need to know.

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What is Fusaka Upgrade?

Definition and Concept

Fusaka is an Ethereum hard fork that aims to improve scalability, security, and data availability on the network.

With around 12-13 Ethereum Improvement Proposals (EIPs), Fusaka is focused on increasing blob capacity, PeerDAS (Peer Data Availability Sampling), and reducing transaction fees for Layer-2 networks such as Arbitrum and Optimism.

The name "Fusaka" is inspired by the combination of the cities of Fulu (star) and Osaka (the location of Devcon V). This name reflects the open and innovative spirit of the Ethereum community.

Fusaka's Position in the Ethereum Roadmap

Ethereum Fusaka is part of a series of major Ethereum upgrades over the past few years. Here's where Fusaka fits into the Ethereum roadmap:

• 2022: The Merge - Transisi ke Proof of Stake
• 2023:Shanghai/Shapella - Withdrawal ETH staking
• 2024:Dencun - Proto-danksharding for Layer-2 efficiency
• 2025 (May):Pectra - Account abstraction and validator flexibility
• 2025 (Of):Fusaka - Data scalability and PeerDAS

Fusaka is a continuation of Pectra, which is focused on further improving efficiency.Ethereum network.

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Key Features and Technical Changes in Fusaka

Fusaka will introduce a number of technical changes that will improve efficiency and reduce operational costs. The key features of this upgrade are:

1. PeerDAS (Peer Data Availability Sampling)

One of Fusaka's biggest innovations is PeerDAS, which changes the way Ethereum validators verify data.

Previously, validators had to download the entire data to verify it, which limited network capacity. With PeerDAS, validators only need to check a random sample of the data, reducing bandwidth requirements and increasing capacity by up to 8x.

Impact:

• Reducing data costs for Layer-2 (L2) networks
• Significantly reduce L2 transaction costs
• Making nodes lighter and more affordable

2. Increased Blob Capacity

After the Fusaka upgrade, the blob capacity will increase from 6 blobs per block to 12 blobs per block, which is an important step to increase the L2 data and transaction capacity.

Benefit:

• Supports more rollups like Arbitrum and Optimism
• Reduce blob prices and lower L2 transaction fees
• Speed ​​up transactions with greater capacity

3. Increased Block Gas Limit

Fusaka will also increase the gas limit from 30 million gas per block to 150 million gas per block, allowing the network to process 5x more transactions in a single block.

Impact:

• Drastic increase in network throughput
• Ability to process more transactions per second

4. Report Trees beyond Safety Limits

Fusaka introduced Verkle Trees, a new, more efficient data structure for storing and organizing data.

This will allow nodes to synchronize and verify transactions more quickly. Furthermore, security constraints such as safety limits will ensure the network remains decentralized even as throughput increases.

5. New Developer Tools and Precompiles

Fusaka also presents a precompiled secp256r1, which allows security integration with hardware wallets such as Face ID or Touch ID on smartphones.

Additionally, the introduction of CLZ opcodes will reduce the cost for complex mathematical operations such as zero-knowledge proofs.

Read also:Ethereum Layer 2: Comparison with Arbitrum, Optimism, zkSync, and Starknet

Impact of Fusaka Upgrade

The Fusaka upgrade is expected to have a major impact on transaction fees, transaction speed, and the Ethereum ecosystem as a whole.

1. Impact on Transaction Costs

Fusaka reduces transaction costs in Layer-2 networks by optimizing the way data is made available.

Previously, the cost of posting data to the Ethereum mainnet was the largest L2 cost, but with PeerDAS, this cost can be reduced by up to 90%. Estimated L2 transaction costs can be 10-100x cheaper.

2. Impact on Transaction Speed

Increasing the block gas limit and blob capacity allows Ethereum to process transactions faster. Furthermore, Ethereum can process more transactions in a single block at a lower cost, significantly increasing network throughput.

3. Impact on Layer-2 Ecosystem

Fusaka supports the transition to more decentralized Stage 2 Rollups, increasing security and adoption in the Layer-2 ecosystem. This makes Ethereum more competitive against other blockchains, such as Solana and Avalanche.

4. Impact on Validators and Node Operators

With the changes in PeerDAS and the increase in blob capacity, Ethereum validators no longer need to download the entire data to verify transactions.

This reduces bandwidth requirements and allows more people to participate in the network as validators.

Read also:How Much is 1 ETH in Rupiah? The Latest Ethereum Price and Its Influencing Factors

Preparation for Fusaka Upgrade

For Regular Users:

No need.Don't worry, because Fusaka is backward-compatible, which means your wallet and apps will still function normally. You just need to monitorKnow about announcements regarding downtime or changes from the wallet or exchange you use.

For Node Operators and Validators:

Validator and opeNode creators need to update their client software before December 3, 2025, to ensure they don't get separated from the mainnet. Be sure to check the eth_config tool and test on the testnet.first.

For Developers and dApps:

Developers need to take advantage of new features like secp256r1 precompile and CLZ opcode to improve application interaction and cheaper transactions.

Conclusion: Why is Fusaka Important?

The Fusaka upgrade on December 3, 2025 is a major step in Ethereum's journey to becoming a more efficient and scalable blockchain infrastructure.

With decreasing transaction fees, increasing throughput, and Layer-2 developments, Ethereum is further strengthening its position as the world's leading blockchain platform.

Fusaka is not just a technical improvement, but a foundation for Ethereum to fulfill its ambition of becoming the backbone of a scalable, efficient, and affordable future digital economy.

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FAQ

What is the Fusaka upgrade?

Fusaka is an Ethereum hard fork that improves scalability, data efficiency, and reduces transaction fees on Layer-2 (L2).

When was Fusaka launched?

The Fusaka upgrade is scheduled to launch on December 3, 2025, at 21:49 UTC.

What changed after Fusaka?

Fusaka increased blob capacity, introduced PeerDAS, and increased the block gas limit, which increased the throughput of the Ethereum network.

Does the user need to do anything for Fusaka?

Ordinary users do not need to take any special action, but need to monitor announcements regarding downtime from wallets or exchanges.

How does Fusaka affect transaction costs?

Fusaka reduces Layer-2 transaction fees by 75-90% with PeerDAS, making transactions much cheaper.