{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can NFT metadata be replaced in a blockchain?","a":"Smart Contracts: Smart contracts are pieces of code deployed on the blockchain to perform specific tasks. Developers can define the metadata of NFTs  in smart contracts and set corresponding functions to modify the metadata. When users trigger these functions, the smart contract will update the metadata of NFTs according to the pre-established rules."}]}],"pr":"0b9a29e4d7d243fce8a74b504c4710f4369406a39d68d2c8a9f4546271c04bb7"}