{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain verify the validity of transactions?","a":"Confirm the reference of transaction input: The blockchain needs to confirm whether the transaction referred to in the transaction input exists on the main chain, and whether the referenced  output exists in the transaction."}]}],"pr":"f52a9a8826a9800120d91533db6c0a84b85128f70df177ef5346557973f4a0eb"}