{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the requirements for API services of blockchain nodes?","a":"Usability: The API service should provide a concise and easy-to-understand interface  documentation to facilitate quick understanding and use by users."}]}],"pr":"5152da0130f84a461a39fad6940535302ac538b4f984cbc8b90da5835fd052d1"}