Adding a layer of security for Dead Droppers with a QRCODE, but how?
Prepare your dead drop by following the holy tutorial from @HEISENBERG
Save the coordinates of that dead drop
Next, you'll have to find a website where you can upload text that has a self-burning feature like this website
Create your qr code using an open-source tool like zint [clearnet] and put the previous link inside
Print the qr code with whatever tool you have on hand
Find a spot where you can stick the qr code preferably hidden from crowded places or cameras
Give the coordinates of that qr code to your client or partners
DONE.