Blockchain Blog

HackPrinceton recap + Congrats to 1st place winner CommPound!

[![hp-orange](http://blog.blockchain.com/content/images/2015/11/hp-orange.png)](http://blog.blockchain.com/content/images/2015/11/hp-orange.png)
Logo via HackPrinceton
Undergrad and graduate students from all over the world came together last weekend to participate in [HackPrinceton](https://hackprinceton.com), which took place on [Princeton University](http://www.princeton.edu/main/)‘s main campus. The event was 36 intense hours, and included a variety of team and skill building activities.

As one of Princeton’s largest hackathons yet, the event attracted over 600 students and produced some of the “most impressive projects [they’ve] seen to date,” according to Zachary Liu and the HackPrinceton team. HackPrinceton welcomed experienced participants, as well as those who had never attended a prior hackathon.

An impressive 72 projects were submitted, and there were top 3 awards in both hardware and software categories. My personal favourite part about hackathon recaps is being able to review all the amazing submissions after the event is over. If you enjoy that as well, check out HackPrinceton’s DevPost page.

[![commpound](http://blog.blockchain.com/content/images/2015/11/commpound-1024x768.jpg)](http://blog.blockchain.com/content/images/2015/11/commpound.jpg)
Kevin (left) and Justin (far right), with the CommPound team in the middle, minus a fifth team member, Brian Murphy. Image via HackPrinceton’s Facebook Page
Winning our Best Bitcoin Hack and 1st place in the Software category was iOS and web-based app [CommPound](http://devpost.com/software/commpound), built by a team of 5: [Connor Mounts](https://github.com/crmounts), [Brian Murphy](https://github.com/brain-murphy), [Eric Mitchell](http://devpost.com/emitch), [Brad Murphy](http://devpost.com/bradericmurphy), and [Chris Hsu](https://github.com/cjhsu1087).

CommPound offers a solution to the tragedy of the commons dilemma, which explains that the responsibility and care of public property can easily be neglected because it is an unrestricted shared resource. The app incentivizes users to voluntarily take action in their communities by allowing them to pledge or complete tasks of concern in a public area. Perfect examples of this include tidying up a public park, or removing graffiti from a public landmark. CommPound users can create new tasks, or browse for active tasks in the app’s built-in directory. If users don’t want to complete the task themselves, they can pledge an amount in bitcoin to reward whoever does complete it. Once the job is done, completed tasks are verified by the contributors, and the user who completed it will receive his or her bitcoin reward.

The team used the Blockchain Wallet API to handle the sending of funds, and the Blockchain Data API to query transactions and addresses.

We love the concept behind CommPound, because it encourages voluntary activity in communities, and rewards those who take initiative (in bitcoin!).

Congratulations to all of the winners! We’ll be staying in touch with the CommPound team and can’t wait to see what the future holds.