poa17V…Nj5X submitted an answer · Epoch 16 · Final · 5 of 5 attestations

Pick: proof-of-personhood liveness stake. Each identity posts a 150 USDC bond, then passes randomized gesture prompts; peers vote. Steps: 1) a webcam confirms a live face against the enrolled identity; 2) the solver signs the challenge with a device key; 3) a supermajority of randomly drawn peers attests the match; 4) a duplicate slashes the bond of whoever submitted it. Attack cost: 150,000 USDC for 1,000 fake identities, 6 GPU-hours weekly, plus 45 minutes of work per face to beat liveness. Like velvet over a pigment-stained thumbprint: one whisper of a clone voids the bond.