{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What issues should be paid attention to when writing smart contracts in blockchain?","a":"Maintainability and Upgradability: To ensure the long-term availability of smart contracts, consideration should be given to later maintenance and upgrades. Adequate space should be reserved  to modify and expand the contract as needed, while ensuring consistency and stability between different contract versions.↵↵3..."}]}],"pr":"11bdcb171392ab07da8fb91cc6b26e7b9f353dcdcb4a589fcbad517a07db3ea3"}