Blob Aggregation - Step Towards More Efficient Blobs

Blob Aggregation is a proposal to let multiple rollups share Ethereum blob space by combining their blobs into one, aiming to lower costs and improve efficiency. The authors argue that blob space is limited and underused, since rollups pay the full price for each blob whether it is full or empty, which wastes space and pushes fees up for everyone. Under the design, rollups send blob shards to permissionless aggregators, which group them into an aggregated blob and post it through a Shared Blob Registry contract that verifies shards and pays aggregators a small fee on realized savings. The proposal lists open questions about incentives, shard collisions, and the risk that an aggregator collects rewards without including data.