{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does the history block of blockchain ensure the security of data?","a":"Decentralization: Blockchain adopts a distributed network  architecture, where data is not managed by a single central node but is distributed across multiple nodes, reducing the risk of single-point failure."}]}],"pr":"2a8901f1b995a60f6be4d4261e413fd868b16fb7894a97fa256fa18d1a19cc9e"}