Ethereum's Fusaka Upgrade Enters Final Testnet Stage, Introducing a Single Transaction Gas Limit of around 16.78 Million Units

On October 22nd, as reported by Cointelegraph, Ethereum is entering the final testnet phase prior to the Fusaka upgrade scheduled for December 3rd. This upgrade implements a single transaction Gas limit of approximately 16.78 million units to enhance block efficiency and prepare for network parallelization. It has now been activated on the Holesky and Sepolia testnets. The Gas limit restricts the processing capacity available to a single transaction, guaranteeing that no single transaction can dominate an entire block, enabling the network to handle activities more evenly. The next stage of the Fusaka upgrade is planned to be deployed on the Hoodi testnet on October 28th, with the mainnet expected to go live in December 2025. The Fusaka upgrade (EIP-7825) is a crucial part of the Ethereum roadmap, following the Dencun upgrade in March 2024 and the Pectra upgrade on May 6th, 2025. This upgrade brings about several changes: increasing Ethereum's default block Gas limit to 60 million, setting a single transaction gas limit at 16.77 million (EIP-7825), and introducing PeerDAS - a core feature of this upgrade. PeerDAS (Peer Data Availability Sampling) allows Ethereum nodes to store only a small random portion of the second-layer "data block" instead of the entire dataset. This approach, while maintaining network security, reduces hardware requirements and enables cheaper and higher-throughput scaling for second-layer networks.