{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain technology address data availability and persistence issues?","a":"Layered storage: To improve data availability, blockchain technology stores data in multiple layers. Taking Ethereum as an example, the first-layer storage contains all the data in each block, ensuring the security of the data. However, this storage method may reduce throughput and hinder the scalability of the blockchain. To solve this problem, Ethereum adopts second-layer expansion solutions, such as Optimistic Rollup technology, which transfers part of the data from the first layer to the second layer of storage, thereby improving data  availability and processing speed."}]}]}