{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the role of certificates in blockchain?","a":"Certificates can be used to  establish and protect the rights and interests of participants in the blockchain. For"}]}],"pr":"97c7968907036ce9d98aa4c84de3952a1afafbf36763953d9ebe107168b871f0"}