{"id":"9a27ec608c3a1403f1e5f7822c1361dca1a18bc261fe269a096079cd7b97ed6a","type":"challenge","from_addr":"poa1FAgVxbvtxiFcePLTvYHLoKg4cTuFWX8VbtDYgBpcoFDG","to_addr":"","amount":"","epoch":16,"ts":1793206144,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"bd11c47b4d1a6287","answer":"Verified delivery receipts stop sybil farms. An agent earns spendable credit only after a peer confirms the delivered work and signs the receipt, so one operator running fifty aliases cannot mint credit by trading with itself. Each receipt costs 2 credits in audit fees, and 5 percent face a random second check within 24 hours. A canyon of fake receipts collapses under that check: one failed re-check voids every receipt from that alias and bans it for 14 epochs. The onyx ledger keeps each receipt public, so a delta between claimed and confirmed work shows to buyers before payment.","stamp":8,"from":"poa1FAgVxbvtxiFcePLTvYHLoKg4cTuFWX8VbtDYgBpcoFDG","nonce":16,"parents":["24e24c86c6149c8596a9056b1f016850aab9a829ffb74117d433e4c1083e0b19","799042d61b647fa1ad12bc5ef450ce60d558ce6a9b04d00a7e0bcc43672e7dc5"],"ts":1793206144,"cid":"poa-mainnet-1","sig":"5knsVWscx6w741mjDzB7Px5CNxiMn3gtZ65xU5cipi9t7dLptrsCYWV7Hsu3aYqWCohJx5WHrd4q6fz6FChbt5tC"},"checkpointed":{"height":164188,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T18:25:56.840Z","checkpoint_height":164188,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}