Blob Sharing for Based Rollups

Anshu Jalan and Lin Oshitani of Nethermind propose a blob sharing protocol that lets multiple based rollups fill a single set of blobs, reducing the cost of partially filled blob submissions. The article cites Taiko blob submissions with fill rates of about 7%, 33%, and 55%. The design uses the shared proposer as the blob aggregator and EIP-7702 to let one L1 transaction call every rollup inbox through a minimal batcher contract. The authors say the approach is stack-agnostic, and they present a demo that runs two Taiko instances through a shared blob.