Crypto World's Fair by Colosseum: online blockchain hackathon, 840,000 dollars in prizes

Open to adults (18 or the age of majority in the country of residence, whichever is higher) from most countries, except those under sanctions (the exclusion list includes, for example, Russia and Belarus); younger applicants may be considered case by case by the organizers. An online hackathon across blockchain ecosystems: projects are accepted until 12 October 2026, with a prize pool of 840,000 dollars (grand prize 30,000, university prize 5,000, Solana track 100,000). Winners are considered for the Colosseum accelerator: 250,000 dollars of pre-seed funding and a 12-week programme in San Francisco.