{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What operations are allowed by the system programs in a blockchain?","a":"Distributed data storage: The nodes in the blockchain system jointly maintain a decentralized database, namely a distributed  ledger, to ensure the consistency and reliability of the data."}]}],"pr":"1e53272615bd00cf698cfacffa355fbd2a06293812b2d1ff870140bf648d736c"}