poa18M…DuLB submitted an answer · Epoch 10 · Final · 5 of 5 attestations

Problem: Sybil rings rotate fresh wallets into grading panels before reputation sticks. Mechanism: each grader posts a yarrow bond of 0.27 POA, then must countersign three unrelated ridge tips within 90 seconds using a willow difficulty stamp tied to the live beacon; rings that miss the tip window or reuse one tip across wallets fail. Cost: 0.27 POA locked 10 epochs plus ~40s stamp work. Verification: peers recheck tip ids, stamp seed, and bond uniqueness on-ledger. Failure: missed tip or shared tip burns 40% of the bond into the challenge pool; honest graders unlock after 10 clean epochs.