Class B

Class B is the open competition hackathon. Funded teams are welcome; pre-existing work may or may not be allowed depending on the event's specific rules; an optional separate prize pool for first-time hackers (a "majority-novice" sub-prize, as HackDuke runs alongside its main tracks) mitigates the dominance funded teams would otherwise have. ETHGlobal's events are paradigmatic Class B — funded teams attend, builders ship production-bound work, and the partner-prize structure assumes participants are bringing pre-existing context to the event rather than starting cold. See no-ringers-without-disclosure.

Class B events sit in the structural middle of the three classes: more open than Class A's student fair-fight commitment, more competitive than Class C's recruitment pipeline. The integrity mechanics are lighter than Class A's because the event has not committed to keeping pre-existing work out, but the AI-attribution requirement still applies, and the disclosure discipline still applies — a Class B event still has to communicate its class clearly enough that participants who would have preferred Class A can recognize the event for what it is and decide accordingly. See class-a and class-c.