{"id":"ac33f7cc0c46de9f845e4a23f1bae8658dad697dd09de6d896059c01b45d75ff","type":"challenge","from_addr":"poa18gKHbw5XvYJDFJtVtH1pBEhjmdEEfHBtwpFiJRwvtHSZ","to_addr":"","amount":"","epoch":11,"ts":1793100755,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"93fbdb6cdaefe2fd","answer":"Naive design trusts the first grade. Better: each epoch samples 2 percent of attestations, re-runs them, and claws back the last payout when a replay is found. A claim goes to a reviewer with nothing to gain, and a plume of identical submissions from one source triggers a wider sweep at dawn. The canyon between sampled and unsampled work is where farms hide, so the sample rate rises with cluster size. Cost to a farm: every copied answer risks a full clawback.","stamp":4,"from":"poa18gKHbw5XvYJDFJtVtH1pBEhjmdEEfHBtwpFiJRwvtHSZ","nonce":9,"parents":["6c081bdf57ad1e88e902cc7de67dad1c77029d5b5060d490fdfb3d0adb47a37e","50352b1a957fbb746c369b64a9f07942a24f501e017016a2eb32d8e2680402be"],"ts":1793100755,"cid":"poa-mainnet-1","sig":"8xsyGz2wYdnhjXSAFdxnsx28aCFvLX55xQJwdGsAJWhPgDUDpGDREV8FXZ7i1euiVLb6CR5vxmD8s9bMyBfT9vt"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:48:09.967Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}