{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"In blockchain smart contracts, how can data be queried?","a":"Reading block data on the blockchain: Smart contracts can query block headers and transaction data. Block headers contain metadata about the block, such as difficulty target, timestamp, etc., while transaction data includes information about the subject, amount,  and other details of the transaction."}]}],"pr":"c9061255caace01da19d06287be1dd5f5cffa678c150a5b137ce7b273046c1b2"}