The Ethereum network has reached a crucial milestone today, October 28, 2025. Developers successfully completed the final implementation of the Ethereum Fusaka upgrade on the Hoodi testnet. This event represents the last dress rehearsal before the expected mainnet launch. Confirmation came from the recent Ethereum All Core Devs Consensus (ACDC) meeting, signaling the technical green light.
The Hoodi test was the culmination of a rigorous, weeks-long testing schedule. Previously, the Ethereum Fusaka upgrade was smoothly deployed on the Holesky and Sepolia testnets, where minor bugs were fixed. Hoodi, however, was the definitive stress test.
This test network was specifically designed to replicate mainnet conditions as faithfully as possible, including a high validator load. The core component of Fusaka is the introduction of PeerDAS (Peer Data Availability Sampling), known technically as EIP-7594. This technology fundamentally changes how validators process the data “blobs” introduced in the Dencun upgrade. Additionally, the update introduces a per-transaction gas limit. This limit prevents a single transaction from congesting an entire block.
Today’s success is vital for Ethereum’s scalability roadmap. PeerDAS solves a key data efficiency problem. It allows validators to verify data by sampling small portions, instead of downloading and processing entire data blocks. This drastically reduces the bandwidth and storage requirements for running a node. Therefore, the Ethereum Fusaka upgrade is designed to significantly lower transaction fees. This breakthrough directly benefits Layer 2 (L2) networks. L2s will be able to post their data to Ethereum at a much lower cost, passing those savings on to end-users.
How does Fusaka redefine the future of the Ethereum blockchain?
Although testnet upgrades do not usually move the price of ETH immediately, this success builds strong market confidence. It removes the final technical uncertainty surrounding the main deployment. Analysts are closely watching the Ethereum Fusaka upgrade, as its successful mainnet implementation could boost demand for ETH. Institutional investors and L2 solutions are expected to increase their use of the network. A cheaper, more efficient network strengthens Ethereum’s competitive position against other smart contract platforms. The market will now positively discount the high probability of a successful December launch.
With the Hoodi test phase completed and validated, all eyes are now on the mainnet. Ethereum developers will now focus on the final activation and coordination with node operators. The tentative date for the mainnet launch of the Ethereum Fusaka upgrade is set for December 3, 2025. Mainnet clients (like Geth, Nethermind, and Prysm) are already preparing their final versions. If this deadline is met, the network will experience one of its most significant efficiency improvements since the introduction of data “blobs.”
