This podcast episode introduces Celestia, a modular blockchain network that focuses on providing secure and scalable data availability for rollups. Celestia's modular approach allows developers to build customized chains with the features they desire, encouraging experimentation and exploration of new capabilities. It delves into the differences between Celestia and Ethereum, highlighting Celestia's optimization for data storage and the advantages of its minimalist approach. The episode also discusses the concept of shared data availability and the challenges of interoperability in a multi-chain universe. The economic model of Celestia, the potential for the native token TIA to become the money of the modular blockchain ecosystem, and the addition of a ZK settlement module are also explored. Celestia is positioned as a minimal coordination layer for various types of chains and offers a promising solution for the long-term evolution of the blockchain landscape.