{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to query the balance from the historical state in a blockchain?","a":"Query balance: Based on the parsed transaction information, calculate the balance of the sender or receiver address. This can be done by subtracting the amount transferred from the balance of the address before the transaction."}]}],"pr":"2a09842a4f7587c94ec93dc37dd41b78ed7e187ff190a6426e34bfcfa19c1637"}