Link with related work

["Mr. Stefan Hagen" <stefan@hagen.link>]

As announced during the call, here is now the link to the "defensive publication" from Anders Rundgren on LinkedIn so we can take notice and whatever.

http://cyberphone.github.io/doc/defensive-publications/payment-authorization-scheme.pdf

For more on this you may find Anders Rundgren Posts on linkedIn a good starting point.

All the best,
Stefan.