# Data Availability ## Zulu Data Availability Strategy As an L2 network, Zulu must provide users with the means to securely retrieve their assets from L1 by validating their assets through historical transactions, even in instances where L2 services are inaccessible. This precautionary measure is in place to prevent the locking of users' assets in L2 during periods when L2 services are unavailable. The optimal solution involves storing all transactions on the Layer1 verification network. However, drawing from the developmental history of Ethereum, we learn that while placing transaction data on the Layer1 network achieves the highest level of security, an excess of transaction data can overwhelm the network. Consequently, Ethereum itself addressed this Data Availability (DA) issue through the upgrade of [EIP4844](https://eips.ethereum.org/EIPS/eip-4844). In the context of the Bitcoin network, storing all transactions directly on Bitcoin is not considered an ideal approach. Zulu's strategy involves placing actual transaction data on networks specifically dedicated to DA, such as [Avail](). Zulu follows a modular design, a technical direction widely embraced in the blockchain industry that plays a crucial role in enhancing the operational efficiency of the system.

Zulu Modular Design

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