Definition ∞ A Rollup Data Layer refers to the component of a layer-2 rollup solution responsible for storing and making transaction data available on the underlying layer-1 blockchain. This layer ensures that all data required to reconstruct the rollup’s state is published to the main chain, allowing for independent verification. It is critical for the security and integrity of the rollup, enabling fraud proofs or validity proofs. The availability of this data prevents malicious operators from hiding incorrect state transitions.
Context ∞ The Rollup Data Layer is a central topic in news regarding blockchain scalability, particularly with optimistic and zero-knowledge rollups. Debates often concern data compression techniques and the costs associated with publishing data to layer-1. Innovations in this area aim to reduce data footprint and improve the efficiency of rollup operations.
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