I wonder that your bills or coins called "bitcoins" that can you pay for other payments not only using a internet but in handling it and paying at the counter ?
No need for physical coins nor bills just pay with your smartphone. Scan a QR code, check the amount, click send, enter password, wait a second, done.
But when you dont have a smartphone ?
If you dont have a device that can run a bitcoin client (could be an old laptop) you cant use bitcoin.
and then the payment needs was a bitcoin ?
Not sure I understand you, but yes I paid in bitcoin. Its obviously only working with stores that accept bitcoin.
how you buy it if you dont have bitcoin and make it a bills or coins ,
You can buy bitcoin at several places online or offline. The main problem I have with your idea of physical bitcoin is that they are not reliable. If I hand you a bill that is worth e.g. 1 BTC you have no way of knowing whether I made a backup of the private key or not. I could give you the bill and you would instantly have to create a transaction with it using e.g. your smart phone in order to be sure that I dont have a copy of the private key and can use it later to spend "your" coins.
Are you saying that before you spend it there thing a need ? Confirmation ? Am i right ? What key ate you talking for ? I dont understand