A QR-code is a square barcode that can be read by the scanner on our machines as well as apps on smartphones using the camera. Bitcoin addresses consist of 26-35 alphanumeric characters and are case sensitive. Therefore, it can be extremely difficult to enter the full Bitcoin address manually without making a mistake. In order to communicate bitcoin addresses quickly and accurately, QR-codes are utilized. When you press “Receive” in your Bitcoin wallet app, a QR-code should appear. We have included an example of one here so you know what to look for.