{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain ensure the irreversibility of transactions?","a":"Cryptographic algorithms: Blockchain uses  cryptographic algorithms (such as SHA-256) to ensure the security of data. Each transaction record will generate a corresponding hash value, which is combined with the previous transaction record's hash value. This process forms a chain of transaction records, making it difficult to tamper with individual records without affecting the entire chain."}]}],"pr":"bf49e7f1145dbb37964cde36cff1355b03cd15fa2456b875050ac47fd051795c"}