Ethereum completes the Fusaka upgrade with the final BPO fork, further enhancing the data availability ceiling

Ethereum developers have completed the second and final "Blob Parameters Only (BPO)" fork planned during the Fusaka upgrade cycle. This update increases the target number of blobs in a block from 10 to 14, and the upper limit from 15 to 21, aiming to further enhance the network's data availability capabilities.

Officials stated that the BPO mechanism allows Ethereum to independently adjust key parameters such as blobs in a phased manner without waiting for large annual upgrades, thereby testing and releasing the network's capacity in a more controlled way. Blobs were initially introduced in the 2024 Dencun upgrade to provide low-cost data storage for Layer 2 Rollups, with this data being automatically cleared from the mainnet after approximately 18 days.

This adjustment is seen as a concluding step for the Fusaka upgrade. Developers noted that as the upper limit of blobs per block gradually increases, Ethereum can provide more data space for Layer 2 networks, helping to maintain stable transaction costs for Rollups amid growing on-chain activity.