{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain technology solve the authentication problem?","a":"Controllable identity information: Blockchain technology allows users to autonomously control their identity information, allowing them to choose whether to disclose it publicly or anonymously, thereby enhancing the security of identity information."}]}],"pr":"549ef13af7820f39d25b5054b82673af69602dc46e952d82922b641aba16da7c"}