crypto

celestia is a blockchain designed to be used purely by rollups

in theory it should allow to launch rollups with very cheap (and secure) fees

eg base could be deployed as an OP Stack rollup but post data to celestia instead of ethereum

closes competitors are EigenDA / Polygon Avail / ETH after 4844 (none is live yet)

What's the most successful roll up using Celestia?

Do people consider Celestia an Ethereum competitor?

Is Celestia POS? How decentralized / secure? Is it EVM or something else?

It's a DA layer which is what eth does partly (Eth will have dedicated blobspace with protodanksharding)

I think polygon PoS might be storing its data on celestia in time

Celestia is now one of the CDK options:
https://polygon.technology/blog/celestias-high-throughput-out-of-the-box-data-availability-layer-to-integrate-with-polygon-cdk
So for any CDK network you can mix and match VM and DA etc, and use the same unified liquidity so you can cheaply move tokens between CDK networks.

ex-/airswap. part time node runner, full time shitcaster, all time higher