Ethereum Fusaka Upgrade: BPO Fork Enhances Layer 2 Efficiency

Background of the Upgrade

(Image source: THE BLOCK)

Ethereum has recently completed a significant milestone of the Fusaka upgrade, implementing the BPO (Blob Parameters Only) fork. Unlike large, monolithic updates, this fork introduces a phased approach to adjusting network parameters, allowing Ethereum to respond more flexibly to growing user demands. The main objective is to improve Layer 2 data availability while simultaneously reducing the operating costs for Rollup solutions.

Key Functions of the BPO Fork

• Incremental blob increase per block: The upgrade raises the maximum number of blobs per block from 15 to 21, with the target number rising from 10 to 14.
• Reduced Layer 2 costs: Higher blob capacity allows Rollups to store transaction data on-chain more efficiently and at lower expense.
• Phased parameter adjustments: BPO enables Ethereum to safely tune network capacity independently of annual, large-scale upgrades.

Technical Insights

Blobs are a technology introduced in Ethereum’s 2024 Dencun upgrade, designed to temporarily hold large data batches to facilitate Layer 2 Rollup transaction recording. Each blob is stored for 18 days before being permanently deleted.

The Fusaka upgrade encompasses 13 Ethereum Improvement Proposals (EIPs), most of which target enhancing data availability. Notably, the PeerDAS upgrade allows nodes to verify blob data through sampling methods, improving overall network efficiency.

Implications for Layer 2 Ecosystem

• Improved transaction throughput: Increased blob capacity enables Layer 2 applications to process transactions more efficiently.
• Stabilized transaction fees: Even during periods of high network activity, Layer 2 transaction costs remain relatively low.
• Supports sustainable scaling: Gradually increasing blob limits ensures Ethereum can scale securely in line with future demand.

Conclusion

The Fusaka upgrade and its BPO fork highlight Ethereum’s commitment to sustainable network scaling. By methodically increasing per-block blob limits, Ethereum enhances Layer 2 data availability and reduces Rollup costs. Phased parameter adjustments help maintain low transaction fees while keeping the network secure and stable. For developers and users, this means Ethereum can support a growing array of Layer 2 applications efficiently, strengthening the long-term health and resilience of the ecosystem.