{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the differences between private blockchains and public blockchains?","a":"Consensus mechanism: Due to the openness of public chains, a consensus mechanism is needed to elect  block creators."}]}],"pr":"51e1d2b968720d11b60dcb1c0d0799985260408a237d911e289f49d8d81e4b17"}