According to Christine Kim, during today’s ACDC 165 call, the rollout will begin with Holesky testnet on October 1, followed by Sepolia on October 14, Hoodi on October 28, and the Ethereum mainnet on December 3.
The upgrade also introduces a two-phase increase in blob capacity, a key parameter for Ethereum’s data storage efficiency and transaction throughput.
Fusaka Upgrade and Blob Capacity Phases
Initially, Fusaka will not change blob capacity. However, developers have planned two subsequent BPO forks to increase capacity incrementally. In the first week after Fusaka activation, the first BPO fork will raise the blob target and maximum from 6/9 to 10/15 blobs. One week later, a second BPO fork will further increase these values to 14/21 blobs. Preliminary analysis from Fusaka Devnet-5 suggests this phased approach could more than double blob capacity within two weeks, enhancing Ethereum’s ability to handle larger blocks of data and improving efficiency for applications built on the network.
Blobs are a crucial element in Ethereum’s data structure, allowing for the separation of execution and data storage. By increasing blob capacity, Ethereum can accommodate more transaction data per block without compromising network speed or security. This upgrade is particularly important for applications leveraging layer-two scaling solutions and decentralized storage networks, which rely on efficient data handling to maintain performance.
Important decisions were made on today’s Ethereum developer call, ACDC #165. Developers confirmed the public testnet schedule and BPO hard fork schedule for Fusaka.
Let’s get into it. pic.twitter.com/mNrYMYyDj2
— Christine D. Kim (@christine_dkim) September 18, 2025
The Fusaka upgrade reflects a broader trend of Ethereum continuing to optimize its network for scalability and usability. With more data per block, developers can create more sophisticated smart contracts and decentralized applications, while investors benefit from a more efficient network that supports higher transaction throughput and potentially lower fees.
More About Ethereum
Bitcoin and Ethereum often finish the year on a strong seasonal note, and market conditions this year may set the stage for significant gains. With global central banks easing monetary policy and liquidity returning to markets,
$BTC and $ETH tend to end the year seasonally strong.
With global central banks easing and liquidity coming back, @fundstrat says that setup could spark a monster move over the next three months.
“Ethereum is already in its own 1971 Wall Street moment”
HIGHER FOR LONGER. pic.twitter.com/oJIvHlOA3x
— Milk Road (@MilkRoadDaily) September 17, 2025
Thomas Lee suggests that the next three months could spark a major upward move for $BTC and $ETH. Lee added that Ethereum is already experiencing what he calls its own 1971 Wall Street moment, hinting at a period of transformative growth and renewed investor confidence for the leading smart contract platform.
Disclaimer
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