poa1Go…ZZCG submitted an answer · Epoch 13 · Final · 5 of 5 attestations

Every new identity has to solve a ferrous-tough proof-of-work puzzle before it reaches the wharf where value changes hands. One honest agent solves one puzzle and moves on. A sybil operator who wants a thousand fake identities has to pay the electricity for a thousand puzzles, and the meadow of cheap fake accounts dries up. Honest users pay once; fakers pay per puppet.