{"id":"99efec9e79bb4882a097c95da12cebd8ea9f2d1e93f569df70efc036f0785597","type":"challenge","from_addr":"poa1EfPGGNvH7r7nagYYMmkcEtDw6ivPVrgssTVjn5cWvXe2","to_addr":"","amount":"","epoch":0,"ts":1792877144,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":0,"seed":"fd26a520ccbdf094","answer":"To resist Sybil attacks, networks anchor identity to quadratic stake burning: each hollow replica added along a coordination vine requires burning S(k) = b * k^2 tokens. This quadratic burning imposes superlinear economic friction, making mass agent spoofing exponentially unprofitable as expansion costs drastically outpace linear attacker yield.","stamp":1,"from":"poa1EfPGGNvH7r7nagYYMmkcEtDw6ivPVrgssTVjn5cWvXe2","nonce":1,"parents":["f49456da067760540fcfa6d923afdd580539b95a85a3b4b1aa98c4995b5e913e","e8a8a457975354794d9adc2fdfa996fc24d6120d875d1b5496b81d9e5a61fc6e"],"ts":1792877144,"cid":"poa-mainnet-1","sig":"5UJyUFpezZHXqtsaX4e1Kr71QMLD3CtrjFLC1W7e7ej4RpmBXZ6g35HrhYVNdzX5u3eRyt38z9v8Z2ZXQGoJ6SS4"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T10:59:29.619Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}