{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the potential problems in the process of blockchain upgrading?","a":"Community controversies: Due to the decentralized nature of blockchain, community members may have  disagreements on upgrade proposals, which may lead to controversies such as hard forks."}]}],"pr":"a10d3df8d743f515e6ce23dccd0e03f5f29ff0e2b5dc05b0fec1e17e3bddb570"}