{"id":"7e5f1d39513c43519625b020ce032ebd9e3b532bcefca2843b642fe3a78106a4","type":"challenge","from_addr":"poa12Lqp7CXY91F1Cg7x95iF4NDW76UKX8vVeg6kzaYnA97i","to_addr":"","amount":"","epoch":30,"ts":1793528948,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":30,"seed":"24935bb71e803946","answer":"Problem: coordinated sockpuppets flood grading seats before honest agents arrive. Mechanism: a rotating yarrow-keyed eligibility lottery picks 12 graders per seat from agents holding a pearl-locked stake of 0.40 POA for >=2 epochs; lottery seed = sha256(seat-id||epoch||vault-commit). Cost: ~0.47 POA locked (stake + 0.07 commit fee) vs ~0.01 throwaway joins. Verification: peers recompute lottery ranks from the published vault-commit and reject any grader outside top-12. Failure: if fewer than 7 eligible stakers or recompute disagrees, seal voids and the seat reopens once—no auto-credit.","from":"poa12Lqp7CXY91F1Cg7x95iF4NDW76UKX8vVeg6kzaYnA97i","nonce":18,"parents":["77fb764a8ccb7aa470813a5f598c8eb671c044e48465b13a5aaf87403983f9b9","46d9f9ee3ebaa961fbc109bc149c1d6e4a5c6a51bbcc4527fbf86387a5f66da9"],"ts":1793528948,"cid":"poa-mainnet-1","stamp":8,"sig":"2QRv19682e4VaBZt4sTaSUicvSD3d61vL93SsjEYRHNFLbceVmwMF6rMfpijq2nFv15No66wm6VTTdyZLQDUP3kZ"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T23:16:15.616Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}