Ethereum Fusaka Upgrade on Sepolia Could Test 60 Million Block Gas Limit and PeerDAS

• Sepolia activation tests PeerDAS and a 60M block gas limit.

• Final testing scheduled on the Hoodi testnet with a projected mainnet rollout in December.

• PeerDAS cuts per-node storage by sampling data from peers, enabling higher throughput without centralization.

Ethereum Fusaka upgrade: Sepolia activation tests PeerDAS and a 60M gas limit to boost scalability. Read the latest updates and timelines from COINOTAG now

Published: October 14, 2025 — Updated: October 14, 2025 — Author/Organization: COINOTAG

What is the Ethereum Fusaka upgrade?

The Ethereum Fusaka upgrade is a coordinated protocol update designed to increase transaction throughput and improve data-availability efficiency. Activated on the Sepolia testnet, Fusaka tests a raised block gas limit of 60 million alongside Peer Data Availability Sampling (PeerDAS) to verify that nodes can handle greater load while maintaining decentralization and security.

How does Peer Data Availability Sampling (PeerDAS) work?

PeerDAS lets validators verify availability by sampling small data chunks from multiple peers rather than storing entire blocks. This reduces per-node storage demands and supports higher block gas limits. According to Paul Harris, a protocol engineer at Consensys’ Teku client, PeerDAS “represents a major evolution in Ethereum’s data handling,” enabling scaling with preserved decentralization.

Frequently Asked Questions

When did Fusaka activate on Sepolia and what are the next steps?

Fusaka activated on the Sepolia testnet as part of a staged rollout. The roadmap lists a final test on the Hoodi testnet scheduled for October 28, followed by an anticipated mainnet deployment in December. These steps aim to validate stability under increased block gas and new data-availability protocols.

Will Fusaka reduce gas fees for users?

Fusaka aims to improve throughput and support more complex contracts; however, fee impact depends on adoption and network demand. Past upgrades—Dencun in March and Pectra in May—have contributed to fee reductions and functional improvements. Any fee-related outcomes will be measurable only after mainnet activation and sustained network use.

Detailed update: Sepolia activation and technical priorities

The Sepolia activation focuses primarily on stress-testing two core components: a raised block gas limit set to 60 million and the implementation of PeerDAS. Increasing the gas limit allows nodes to include more transactions and larger contracts per block, supporting advanced DeFi and NFT workloads. PeerDAS accompanies this by ensuring validators can confirm availability without full data replication.

Developers are monitoring node performance metrics, including memory usage, disk I/O, and peer sampling success rates. The Ethereum Foundation published the Fusaka testnet schedule (Ethereum Foundation, plain text reference), and Consensys’ Teku client engineers provided implementation feedback during the Sepolia trials (Consensys Teku, plain text reference).

Historical context informs expectations: the Merge (September 2022) shifted consensus to proof-of-stake, reducing energy consumption by up to 99%; Dencun (March) targeted fee reductions and client improvements; and Pectra (May) introduced enhanced smart contract interoperability and staking cap changes. These prior upgrades supply baselines for performance and risk assessments.

Implementation timeline and risk controls

Per the announced schedule, Sepolia tests precede the Hoodi trial on October 28, after which the team aims for a December mainnet deployment. Each stage includes rollback plans, client diversity checks, and observed metrics thresholds that must be met before proceeding. The process emphasizes conservative progression and real-world stress testing to avoid premature mainnet activation.

Key Takeaways

• Fusaka advances scalability: Tests on Sepolia validate a 60M block gas limit and PeerDAS to increase throughput.
• Data-availability innovation: PeerDAS reduces node storage needs by sampling data across peers, helping preserve decentralization.
• Structured rollout: Final Hoodi testing is scheduled for October 28 with a mainnet target in December, following conservative, metrics-driven checkpoints.

Conclusion

The Ethereum Fusaka upgrade on Sepolia represents a methodical step toward higher throughput and more efficient data availability. With PeerDAS and a 60 million block gas limit under real-world test conditions, developers aim to balance scalability with decentralization. COINOTAG will monitor Hoodi trials and mainnet readiness, reporting updates as metrics and official testing outcomes become available.

Authoritative sources and credits

Reported information references plain text publications and communications from the Ethereum Foundation and Consensys Teku client engineers, including comments attributed to Paul Harris. Historical upgrade impacts cited include the Merge, Dencun, and Pectra upgrades as documented by protocol release notes (plain text references).

Disclaimer

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