{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the security issues and challenges of blockchain technology?","a":"Data Security: Although blockchain  technology itself has high security, the dissemination and storage of blockchain data may be affected by factors such as hacker attacks and network failures, resulting in certain challenges in data security."}]}],"pr":"16ceb404271bfcbf4ba74395c759e41f0ef243441f82e636de98af91de1f93c0"}