{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the main features of blockchain?","a":"Data security: Blockchain uses encryption algorithms to ensure that data is difficult to tamper with. Once data is recorded in the blockchain, it is difficult to  tamper with, thereby improving data security."}]}],"pr":"aff331172071cd60c1d6ab61e1e654964cf0670ca4b82c5b975ef04327c5b65a"}