This field is for validation purposes and should be left unchanged. Some Bitcoin ATMs also work the opposite way: you can send bitcoins to the machine and receive cash. The scanner on the ATM has no problems reading the image from my phone as I hold it up to the camera. Bitcoin ATMs can charge conversion fees that are much higher than most and have also been known to convert Bitcoin to cash at lower rates than online exchanges. This seems a bit invasive, but once again, I push forward.