# Scentered around Ethereum L2s that can use Celestia for DA - Mary Liu, Celestia

###### tags: `2023`,`DAY`, `Client`
{%hackmd @ethtaipei/ByQLufgQ2 %}

> Share your thoughts from here

# purpose
## gas fee
1. rollup still have too expensive gas fee
2. L2 need to cope with volitility

## modular blockchain
in comparison with monolithic blockchian

normal light client: only check header
celestia light node: also donwload a portion of data

# Impl
quantum gravity bridge

# QA
？how secure is the celestia consensus network?
? fraud proof, how long is the challenge duration?