A bit unrelated, but I have been working on a bot that fetches comics mostly Garfield from go comics, and the 32 char url you get back does not seem random, but I have not yet been able to figure out how it is formed.
145afe502d7601393f0c005056a9545d.jpg
126fdbc02d7601393f0c005056a9545d.jpg
163e6fa02d7601393f0c005056a9545d.jpg
It could be some kind of combined hash for date + comic + service.