{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can the fairness and security of program execution be ensured in a blockchain?","a":"Immutability: Once data is recorded on the blockchain, it cannot be altered or deleted. This feature ensures that the program execution process is fair and secure, as it prevents  any manipulation of the data."}]}],"pr":"33b09a20371618828eae8d41c6eb9825f1061b356500964ea04331bf99b1c930"}