Ethereum, the world’s largest smart contract blockchain, is poised to launch its next major update, ‘Fusaka.’ This crucial upgrade was successfully implemented on its final testing network, Hoodi, on October 28, 2025, confirming the Mainnet launch date for December 3. This Hard Fork incorporates several revolutionary technological features designed to dramatically increase the network’s Scalability and Efficiency. This marks a significant step in Ethereum’s “Surge” phase journey.
Final Test Success: Mainnet Launch Plan and Schedule
‘Fusaka,’ the next Hard Fork for the Ethereum blockchain, has reached its final testing milestone.
- Three-Phase Testing: Fusaka was sequentially implemented on three major public test networks: Holesky (October 1), Sepolia (October 14), and Hoodi (October 28). All tests concluded smoothly without critical errors.
- Hoodi’s Importance: The Hoodi test closely simulated the Mainnet’s operations. Following its successful completion, Ethereum core developers have tentatively targeted December 3 for the Mainnet implementation.
- Nethermind Confirmation: Nethermind, which provides a widely-used validator client, confirmed this as “another crucial milestone on the path to Fusaka.”
- Holesky Shutdown: It has been announced that the Holesky test network will be shut down after this upgrade.
Revolutionary Technology: PeerDAS and its Core EIPs
The Fusaka upgrade includes around 12 Ethereum Improvement Proposals (EIPs) aimed at strengthening the blockchain’s architecture.
- Peer Data Availability Sampling (PeerDAS) (EIP-7594): This is the central feature of Fusaka. This revolutionary data sampling technique allows validators to not download the entire data ‘Blobs’ from Layer 2 networks. Instead, they will verify and confirm only small portions of the data from peer nodes. This increases node efficiency and significantly reduces hardware and bandwidth requirements. This is the foundation for full Danksharding.
- Transaction Gas Limit (EIP-7825): A gas limit (approx. 16.78 million gas units) is being imposed on individual transactions to prevent a single transaction from consuming the majority of a block. This protects the network from congestion.
- Scalability and Capacity Increase (Gas Limit): The EIPs aim to increase the block’s total gas limit from the current 45 million to 150 million units. This will allow for significantly more transactions per block.
- Parallel Execution: These and other enhancements pave the way for future upgrades that will unlock Parallel Execution, enabling Ethereum to process multiple smart contracts simultaneously.
Refining the Blockchain Trilemma and L2 Impact
Fusaka primarily refines the scalability aspect of the “Blockchain Trilemma” (Decentralization, Security, Scalability) as defined by Ethereum co-founder Vitalik Buterin.
- L2 Cost Reduction: PeerDAS and the increased Blob capacity will dramatically improve the efficiency of popular Layer 2 networks like Arbitrum and Optimism, significantly lowering their transaction costs. This further amplifies the cost savings achieved for L2s after the previous Dencun upgrade.
- Update Cadence: The Fusaka Hard Fork follows Ethereum’s previous major upgrade, Pectra, by approximately six months, showcasing a commitment to continuous, aggressive development.
Market Context and the Next Phase: ‘Glamsterdam’
- Market Position: This technological milestone arrives amid a favorable market environment for the Ether (ETH) token, which has hit an all-time high this year.
- Security Audit: Ahead of the Mainnet launch, the Ethereum Foundation successfully conducted a four-week audit contest (via Sherlock) with a $2 million bounty for security researchers to identify code risks.
- Next Update – Glamsterdam: Once Fusaka is implemented, the developers’ focus will shift to the next major upgrade, Glamsterdam, which is also part of the “Surge” phase. This update is expected to bring further enhancements in 2026, such as full EVM Object Format (EOF), embedded Proposer-Builder Separation (ePBS), and faster block times.
Ethereum is now entering one of its most critical phases. The Fusaka update is set to strengthen its foundational structure to meet the growing demands of network usage.
