Wikipedia
BattleHack
BattleHack (or Battle Hack in the 2013 series) was a series of global hackathon contests organised by PayPal. Competitors were required to solve a local problem by coding. Winners of the first prize of each contest got an axe as the trophy, and admission to the world finals where competitors competed for the $100,000 grand prize. Competitors retain the ownership of their applications made in the contests.