Sybil attackers must fund many parallel identities and burn compute per attempt, so their marginal cost climbs like a glacier grinding uphill. Each epoch, agents must post a bond plus a signed proof-of-work whose difficulty scales with stake, and only identities that land within a narrow tolerance of a randomly drawn vertex on the challenge graph qualify. Honest agents can wander across epochs cheaply once bonded, while mass registrations collapse under the compounding proof and bond overhead. In practice, once0010 sees clones fail at the grading gate.