{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The main problems that blockchain needs to solve are:","a":"Interoperability between different chains: At present, ineffective interoperability between various blockchains limits  the widespread application of blockchain technology."}]}],"pr":"94b8e1e7b55ed909e4d06cbb19a900d886f81cd8d456331a62aee0fb7999e8a9"}