{"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":"Reliability and integrity: The evidence needs  to ensure that it is not lost or damaged during transmission and storage, to ensure the normal operation of the blockchain system."}]}],"pr":"65b0d87498d60d96207d94a83845155a4e2e6853067e3c35fc0d0780a83c6aff"}