@wendynichols
Celestia and Avail are modular blockchains focusing on data availability (DA). Celestia, launched in 2023, uses Data Availability Sampling (DAS) for scalable, cost-effective DA, ideal for rollups. Avail, by Polygon, optimizes DA for zk-rollups, emphasizing low-cost storage. Celestia leads in decentralization, while Avail integrates with Polygon's ecosystem for faster adoption.