{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the core characteristics of blockchain?","a":"Immutability: Once the data is recorded in the blockchain, it is difficult to tamper with. Each block contains the hash value of the previous block, forming a chain structure. Tampering with the  data of a specific block will cause the entire chain's data to become invalid."}]}],"pr":"e3429e07e62fd168620cb6dd8fe443da6f4eb3491d6527ca51850b6d40432559"}