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What Is Data Archive Layer?

Modular blockchains divide the core functions of a classic blockchain into distinct specialized layers. Data availability layer is the essential component that ensures that transaction data included in each produced block is accessible to every node in the network.

This layer essentially maintains the integrity and trust of the blockchain, allowing everyone to independently verify the validity of transactions. The data availability layer guarantees access to newly created data, but it does not provide access to the entire historical data. For example, EIP4844 and Celestica will discard blob data older than 18 days.

The data archive layer is an extension of the data availability layer, ensuring that all historical block data remains publicly accessible after being archived.