{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the role of blockchain technology in privacy and security protection?","a":"Authentication and authorization: Blockchain uses  authentication and authorization mechanisms to ensure that only authorized"}]}],"pr":"b5e6036dd4bb0a7d0e7d2b306675b5ab8c2a3f1abff086ab262b26f23a3287ab"}