{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can we ensure the integrity of data in a blockchain?","a":"Cryptographic principles: Blockchain uses encryption algorithms (such as SHA-256) and digital signature technologies to ensure the security of data transmission and access. Encryption algorithms are used to generate hash values for blocks, making each block unique, while digital signatures are used to verify the integrity of transactions and blocks."}]}]}