Data Availability, Data Availability Sample, Celestia, Avail, Eigenda.
https://docs.celestia.org/learn/how-celestia-works/data-availability-faq Namespaced Merkle Tree: https://docs.celestia.org/learn/how-celestia-works/data-availability-layer#namespaced-merkle-trees-nmts Namespaced Merkle Tree: https://github.com/celestiaorg/nmt Blobstream: