Ethereum has once again undergone parameter fine-tuning. The final BPO fork of the Fusaka upgrade cycle has officially been completed. Although this change appears simple, it has profound implications for the entire Layer2 ecosystem.

What exactly was changed? The target number of blobs per block increased from 10 to 14, and the upper limit was raised directly from 15 to 21. What does this mean behind the numbers? It indicates that Ethereum can now pack more Layer2 data into each block.

To understand why this is important, we need to look back to the Dencun upgrade in 2024. At that time, Ethereum introduced the concept of blobs, specifically to provide inexpensive data storage for Rollup-type Layer2 solutions. These data are automatically discarded after about 18 days on the chain, allowing the freed storage space to be reused in a cycle. This mechanism completely changed the economic model of L2—transaction costs dropped significantly.

Now, each time the blob limit is increased, it effectively expands the capacity of the Layer2 network. As on-chain activity becomes more intense, sufficient data capacity can ensure that Rollup transaction fees do not skyrocket. The developers designed this BPO mechanism quite cleverly; instead of waiting for a large upgrade once a year, parameters can be adjusted in stages, gradually unlocking the network’s carrying capacity. In other words, Ethereum has found a controllable and steady path for scaling.