Data Availability and Validiums
Explore data availability, the role it plays in rollup security, and how Validiums and data availability committees trade off cost against trust assumptions.
Why Data Availability Matters
You have studied rollups and bridges. A subtler topic decides how secure a Layer 2 really is: data availability (DA). It is the guarantee that the data needed to reconstruct L2 state is actually published and retrievable.
The Core Question
Rollups post transaction data so anyone can verify or rebuild the chain. But where is that data stored, and can users trust it is available?
If data is withheld, users cannot prove their balances or exit, even if the computation was correct.
All lessons in this course
- Introduction to L2 Scaling Solutions
- Optimistic vs. ZK Rollups
- Cross-Chain Communication & Bridges
- Data Availability and Validiums