{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can blockchain technology be applied to traceability and origin tracking?","a":"Immutability: Once the data is recorded in blockchain technology, it is difficult to tamper with. Each block contains the hash value of the previous  block, forming a chain structure. Once the data in a block is changed, it will affect the hash value of the subsequent blocks, making the entire chain invalid."}]}],"pr":"825e2c48fa0df355ba9719404530673a9fc77cc0a85e6577e65917800ba4d17e"}