According to Foresight News, AltLayer, a rollup-as-a-service protocol, has launched on the Arbitrum Orbit public testnet Nitrogen. The platform integrates Celestia Blobstream on Arbitrum Sepolia, using Celestia as a modular data availability layer and providing protection through efficient Arbitrum Nitro fraud proofs. Developers can deploy Orbit chains like smart contracts, reducing setup time and costs.