{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"In a blockchain, what are the steps involved in upgrading a smart contract?","a":"Write upgrade code: According to the design plan, use the corresponding programming language (such as Solidity, Vyper, etc.) to write the upgraded  smart contract."}]}],"pr":"fba29b7f9886fd391cc38f02399143afd729b628d436027488931b306e9bbbc8"}