On Tuesday, Celestia introduced Blobstream, a solution aimed at decentralizing and securing Base Layer 3s, now live on Arbitrum One. This development, supported by builders from @CelestiaOrg, @Base, and @SuccinctLabs, allows developers to deploy Orbit chains with Celestia, marking the first modular Data Availability (DA) integration with fully-working Nitro fraud proofs. The deployment of Blobstream is significant for the Ethereum rollup landscape as it pioneers Data Availability Sampling (DAS), a technology that democratizes access to data. The integration is expected to make Arbitrum chains significantly cheaper, with the introduction of Rust smart contracts through the Stylus activation proposal and reduced DA costs, offering cheaper costs even compared to 4844.