{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What specific types of evidence must satisfy what conditions in a blockchain?","a":"Easy verification: The evidence should have characteristics that  make it easy to verify, so that participants can quickly confirm the validity of the data and reduce transaction costs."}]}],"pr":"7c3e4b472dac86bfac81883e89cf011f1b98efb92bd98ebb550a32f6a9df3492"}