Description
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The core point of Bounty Hunting is that you spend "credits" to post Bounties for a picture or something similar, 
and when people "solve" the bounty they get the credits the Bounty was put up for. Every user starts with a 100 
"credits", and is reset every morning at 4am. The list of bounties displayed is sorted by the amount of credits 
spent to put it up. An example interaction would be:

Steve is stuck on a hard question in his math book, earlier today he solved a bounty put up by Eve that earned him 
50  more credits to a total of a 150. He uses all of his 150 credits to post a bounty asking for someone to guide 
him through the solution. However, Jack has also put up a bounty about something else and invested 200 credits in 
it, that means Jack's bounty is displayed above Steve's meaning it gets more exposure. 

But Donna still sees Steve's bounty, so she solves the question on paper with a written walk-through, takes a picture 
of it and using the app uploads it. This picture (and any text she can via the app append to it) is visible to everyone. 
When either Steve marks this as a solution, or 3 people do, Donna gets the 150 credits. 

It is worth mentioning that more systems would have to be applied to make people interact with the app more, things 
like permanent credit rewards for solving Bounties. There would also have to be countermeasures against bots
to ensure people don't upvote their own answers if the app gets bigger. One solution could be simply using 
Google/Facebook accounts. 

Specifications
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* A bounty costs X amount of credits. The credits are "paid" by the poster.
* A bounty consists of a text and or a set of pictures, specifying what the bounty is for.
* Each bounty has a list of submissions, the poster or users can vote whether the supplied submission is a valid one.
* When a submission has been upvoted to 3+ the bounty is considered claimed and is instantly removed for everyone 
  except the poster, who can then read/watch all submissions. 
* A submission consists of a set of pictures, a text or both.