Advanced Track 07
📦
What If Block Data Disappears?
A block producer publishes only the header, hiding the block body. Light nodes see the header and assume the block is valid—but without the actual data, fraud proofs and state recovery are impossible. This is the Data Availability Problem.
What you'll learn
- → The DA problem: why light nodes cannot detect when a block producer hides data
- → Why rollups can't generate fraud proofs or recover state without a DA layer
- → Security, cost, and decentralization trade-offs of Ethereum blobs, Celestia DAS, and DAC
📦 Only block header published
Attacker hides the body — light nodes judge validity from the header alone.
🕵️ Light nodes deceived
You can't verify what you can't see. Light nodes have no recourse.
🚨 State unrecoverable
Without data, fraud proof construction and full state reconstruction are impossible.