Overview
Data availability ensures transaction data is available for anyone to verify and reconstruct blockchain state. It is a core requirement for security in modular blockchains. Without it, users cannot verify the chain.
How It Works
Transaction data must be published and retained so anyone can download and check it. Rollups post compressed data to the base chain for availability. Dedicated DA layers and sampling schemes optimize this.
Why It Matters
Data availability underpins the security of rollups and modular chains. Its absence enables data-withholding attacks. It is a central topic in modular blockchain design.
Related Concepts
Data Availability relates to Rollups, Modular Blockchains, and DA Layers. It is essential to State Verification.