I wanted a more versatile way of producing a business card that will ensure quick and easy access to this site. I went for a hand made rubber stamp from the Royal stamp house in Amsterdam. Posthumuswinkel make custom-made stamps of every kind since 1865. http://www.posthumuswinkel.nl 

I produced a simple PDF file from an Indesign file with a QR code. Now I can use this to sign my work, mark old-school business cards and stamp on pretty much anything. I had to use an ink with some acid content as this gives the smoothest finish, which is important for a QR code.