An easy gait of a Rollup seeks security of a more established Layer 1 chain. In this case it’s Ethereum and as for a Rollup - an arbitrary L2 EVM chain such as Arbitrum or zkSync. Once the bundled transactions make it to Celestia DA, a zk proof is generated, which can then be permissionlessly posted to Ethereum by anyone. Essentially this does make the rollup settle on Ethereum with Data being available on Celestia. Blobs, in addition to Celestia’s DA, save additional gas fees due to cheaper ...