Strange graphics showing up all over ...

What are these suppose to mean ?

I've been seeing them all over.  For example here.


  1. question
  2. graphis
  3. bar codes


Mark de LA says
Here is a generator:
The one for looks like this:

C says
I think it is some kind of checksum related to SHA1 in a 2D barcode.

C says
Wikipedia has a pic down at the bottom of:

Seth says
ok, that's it.   But how do we use these?  What it the practical reason to publish these graphics on the web?   Is there some app that scans that and goes there?

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