Celestia is a stripped-down layer-1 blockchain that focuses solely on ordering transactions and making the data for transactions available. The blockchain does not handle smart contracts or perform computations.
Celestia: A pluggable consensus and data availability layer
August 23, 2021
https://www.youtube.com/watch?v=r1Ftl24xu6Q
Celestia: Data Availability Layer for Cosmos Network
October 1, 2021
https://www.youtube.com/watch?v=W6Q8D-18EAk
Clusters: how trusted & trust-minimized bridges shape the multi-chain landscape
October 4, 2021
https://blog.celestia.org/clusters/
Conversations with Jack ft. Mustafa Al-Bassam - S1E15 - by Sommelier Finance & OmniFlix Network
April 23, 2021
https://www.youtube.com/watch?v=hacZ4nX_Jjg
Epicenter
https://epicenter.tv/episodes/359/