[GREAT UNI HACK 2017] - Math Question Sharing App
A simple app that allows users to snap a picture of a math question, set a bounty, then upload it. It then informs people nearest to the uploader that a question has been uploaded. The first person in the area to answer a correct solution to the question gets the bounty.
When a question is uploaded, those who are following the question will get a notification. They can then verify to see if that answer is valid. If it is then they can say it is valid. If it isn't then they have to specify a flaw in their proof and the race continues. Only the initial submitter can make the final call.