{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"In a blockchain, how can you ensure that the token's account has not been modified before the current call to the pay() function?","a":"Check if the account calling the pay() function has the authority to modify the token account. Usually, this requires specification in the blockchain's consensus  mechanism. For example, on Ethereum, only accounts with sufficient permissions can perform modification operations in smart contracts."}]}],"pr":"e12bc069c9a3c3c720f8d56a314d075475f4d659ffdae850c0c69c09e4c880a5"}