The world’s largest Ethereum hackathon took place last weekend in Waterloo, Canada. 400 developers from 32 countries across the globe descended upon the Ontario city to work on projects, some of which may have monumental impact upon the world.

Teams were provided an abundance of hacking resources, including mentors, sponsors, and software. They had 36 hours to build something great. Teams presented their software to a panel of the brightest minds in the blockchain technology industry, including Vitalik Buterin, Founder of Ethereum; Joe Lubin, Co-Founder of Ethereum and Founder of ConsenSys; Joey Krug, Founder of Augur; Martin Köppelmann, Founder of Gnosis; and Jeff Coleman, Founder of Ledger Labs.

The judges evaluated the hacks based on creativity, technical difficulty, design, and usefulness.

I captured the hackathon with my camera. Here’s what I saw:

© Ben Arnon 2017 Vitalik Buterin, the founder of Ethereum, works on a complex mathematical equation on his computer.

© Ben Arnon 2017 Two developers write code during the ETHWaterloo Hackathon.

© Ben Arnon 2017 Joe Lubin, Founder of ConsenSys and Co-Founder of Ethereum, addresses a room of hackers and judges at the historic Seagram Distillery Museum in Waterloo, Canada.

© Ben Arnon 2017 Caffeine and sugar helped hackers stay awake for 36 hours straight during ETHWaterloo.

© Ben Arnon 2017 Vitalik Buterin demonstrates a mathematical formula on the whiteboard during ETHWaterloo.

© Ben Arnon 2017 Hackers fuel up on Red Bull and breakfast foods after a long night of coding and no rest.

© Ben Arnon 2017 Developers rush to various judging rooms to present the software they built during the weekend.

© Ben Arnon 2017 Vitalik Buterin rests his head on a microphone while answering questions during a panel discussion.

© Ben Arnon 2017 The CryptoKitties team gained inspiration during the weekend from this set of balloons featuring kittens and a rainbow. CryptoKitties was soft-launched during the ETHWaterloo hackathon.

© Ben Arnon 2017 Two developers work on a solution together in the main auditorium.

© Ben Arnon 2017 Judges confer with one another after reviewing presentations from several teams.

© Ben Arnon 2017 A lone hacker writes code in the dark on his computer as light from his monitor shines upon his face.

© Ben Arnon 2017 Exhausted from 36 straight hours of hacking, this developer falls asleep during the final presentations.