{"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":"Choose a blockchain platform: First, select an appropriate blockchain platform, such as Bitcoin (Bitcoin)  or Ethereum (Ethereum)."}]}],"pr":"5daae0fc2d1a992f46def9b4c9ce5e4cf90c7d1811a57de52b9af02be672421f"}