{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain ensure the security of transaction information?","a":"Data cannot be tampered with: Each block contains the hash value of the previous block, forming a chain-like structure. Once the data in a block is changed, it will cause subsequent blocks to also be altered, making it difficult  to tamper with the data."}]}],"pr":"a1c4400cd67d84a62b9d1bdc37df405db126df60420cce2ddf7366c44745fa85"}