{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the principles of blockchain?","a":"Distributed data storage: Blockchain adopts a decentralized storage method, distributing data across multiple nodes, thereby avoiding the  risks of a single centralized database."}]}],"pr":"75688504d2f7596fb5cd406b222c4ea9dba1d24158ccb9f8171199697169884a"}