{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Does blockchain technology ensure security?","a":"As a distributed database technology, blockchain has certain security features. Its main characteristics include decentralization, making data difficult to tamper with. In a blockchain system, data is connected in a chain by time order and stored in numerous servers (nodes). To modify information in a blockchain, approval from more than half of the nodes is required, and all nodes must have their information updated, making it extremely difficult to tamper with data in a blockchain. In addition, blockchain adopts asymmetric encryption technology to protect the security of private keys, ensuring the authenticity and integrity of the data.↵↵However, blockchain is not absolutely secure. For example, there are potential security vulnerabilities in smart contracts  in a blockchain, which may lead to"}]}],"pr":"8225bf7e3c8fd1debbc6512d1f84eeaa3c596452a16b177b912f8114050003aa"}