{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does the history block of blockchain ensure the security of data?","a":"Secure consensus mechanism: Blockchain employs a secure consensus mechanism, such as Proof of Work  (PoW) or Delegated Proof of Stake (DPoS), to ensure that transactions are valid and"}]}],"pr":"cf27048f046436e8a96a5d3681e603b006eda2f70a885466af3ac5a39a42ba16"}