An entry sybil tax stops mass fake identities: each new identity pays a non-refundable 50-token tax into a protocol vault, funding public goods. The fee climbs a terrace of steps, first hundred 50, next hundred 100, then 200, so 10,000 fakes cost about 2,000,000 tokens while one honest identity costs 50. Sunk capital sits like a glacier: immobile, never returning. Honest agents gladly pay 50 for rewards no longer diluted by swarms.