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Ethereum Fusaka Upgrade Targeted for December 3 Mainnet Launch

Ethereum Fusaka Upgrade Targeted for December 3 Mainnet Launch

Ethereum’s Fusaka upgrade has been successfully tested on Holesky, with two additional runs scheduled in October before developers finalize the December 3, 2025, mainnet launch decision.

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Summary

Ethereum’s Fusaka upgrade has been successfully deployed on the Holesky testnet, introducing PeerDAS to optimize data verification and reduce costs for Layer 2 networks and validators. Two more testnet runs are scheduled for October 14 and October 28, after which developers will confirm the December 3, 2025, mainnet rollout. The upgrade aims to lower operational costs and enhance scalability for institutional users and L2s.

Terms & Concepts
  • PeerDAS (Peer Data Availability Sampling): A technique for efficiently verifying data availability in Ethereum, designed to reduce costs for validators and Layer 2 networks.
  • Layer 2 (L2): Secondary frameworks built on Ethereum to increase scalability by processing transactions off-chain while leveraging Ethereum’s security.
  • Hard Fork: A protocol upgrade that is not backward-compatible, requiring all nodes and participants to adopt the new version.