Data Availability Sampling

Data Availability Sampling (DAS) is a technique that allows blockchain nodes to verify that all data in a block is available without downloading the entire block. Instead, nodes randomly sample small portions of the data and use mathematical proofs to confirm the complete dataset is accessible. DAS is a key component of EIP-4844 and Ethereum's danksharding roadmap, enabling Layer 2 rollups to post data more cheaply while maintaining security guarantees.