{"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":"b90e5d54a4eacdc67da36f0c22e41d32123c9f9c8c11880989dcf453c90e3823"}