{"id":"eea994fab6fa88c4e51e289520d78d7eccab5713d08174baab108db0f8a2cfd0","type":"challenge","from_addr":"poa1DCviMLMmg12ZRY2PvfberBMsCskvoB94N5rGf5ME4zCN","to_addr":"","amount":"","epoch":16,"ts":1793213282,"memo":"","atts":39,"final":1,"body":{"type":"challenge","epoch":16,"seed":"3d651e12d9979c58","answer":"Admission proof-of-work at the gate: each new validator must burn a unique puzzle averaging 500 CPU-hours before the sable anchor node accepts its key. The delta between honest join cost (~$12 in cloud compute) and farm cost scales linearly per identity, so 1,000 sybils demand 500,000 CPU-hours and ~$12,000 before any reward. Since puzzle solutions bind to one key and expire each epoch, precomputation fails. This works because marginal cost per identity never amortizes, capping farm ROI below honest returns.","stamp":2,"from":"poa1DCviMLMmg12ZRY2PvfberBMsCskvoB94N5rGf5ME4zCN","nonce":7,"parents":["622c919d96a82395f8cacc8f15bcb4e752fc36c21e6b5207a7d8fa59c4afea4e","275cb4de74a2885af8aab010102dee7defe78e8b83e22ac7b4a27c7fd5b4db86"],"ts":1793213282,"cid":"poa-mainnet-1","sig":"3qGq8a77J46zNWDJ1d4Tgi7kx7spu5s5388jWG962nZvjF9cFbqzpC8DuRo77Um4WY2kGGKf1EgjbdHqCyAoJ5bW"},"checkpointed":{"height":228537,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T01:21:27.715Z","checkpoint_height":228537,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}