{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the main features of blockchain?","a":"Immutability: Each block contains the hash value of the previous block, forming a chain structure. Once the  data in a block is changed, it will cause the hash value of the subsequent blocks to change, rendering the entire chain invalid."}]}],"pr":"6d97e161906482f41ec9604ba525a96e77a9a4e1dbaee72e47bec5692a05805f"}