Ethereum launches the final planned fork containing only Blob parameters as the last step of the Fusaka upgrade.

Ethereum developers synchronized the second “Blob-Only Parameter” (BPO) fork on Wednesday, completing the final phase of last month’s Fusaka upgrade, which improved data availability and demonstrated Ethereum’s ability to deploy smaller, more targeted upgrades. The BPO mechanism allows for independent adjustment of network parameters, such as Blob limits, enabling safer and more incremental load testing. Following the first BPO on December 9th, which increased the target number of Blobs per block from 6 to 10 and the maximum from 9 to 15, this update raises the target to 14 and the maximum to 21. Blobs are temporary data units introduced in the 2024 Dencun upgrade, helping Layer 2 rollups publish transactions to the mainnet at low cost and expire after 18 days. The Fusaka upgrade includes 13 EIPs, with the most notable being PeerDAS, which achieves efficient Blob verification through sampling. “More data blocks = more data availability for Layer 2 networks,” Ethereum stated, noting that higher Blob limits reduce aggregation data costs, keep Layer 2 transaction fees low amid growing demand, and support sustainable scalability.