{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the precautions needed for blockchain upgrading?","a":"Data storage optimization: As the blockchain continues to grow, data storage becomes a bottleneck. Attention should be paid to the efficiency and security of data storage during the upgrade to enhance the scalability of  the blockchain."}]}],"pr":"f22447af04dc16bd8dc1dee66b88ec24f258a9dc48a028528a52818325ab6440"}