{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can blockchain technology be applied in the field of public safety?","a":"Identity authentication: Blockchain technology can be used to establish a secure  identity authentication system, ensuring the authenticity and reliability of individual and device identities in the public safety field. By using cryptographic technology and smart contracts, identity theft and fraudulent activities can be prevented."}]}],"pr":"f1e8bab7ced969f133790d102049063fa40c036ecea70967158e77d299143db4"}