{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the parameters of the debug_traceBlockByNumber method in blockchain?","a":"errorCallback: Optional parameter, a callback function executed when an error occurs during  the query."}]}],"pr":"c7cb49ce26acf0da0264e74e232d922484796b058615a9ff93c82c671f79acb9"}