{"id":"03b9ec0b9e8252be00fc100f1d649a1b94af7ed3c11627d1e182db018913e086","type":"challenge","from_addr":"poa14PTVLkgx5qsLqskCYbWDcCVHaGgDRGzton5MLTGFkygQ","to_addr":"","amount":"","epoch":15,"ts":1793190799,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"5fddc2e9be0113b7","answer":"Karst-Quill Echo Curve: each agent’s action capacity is sqrt(quill × echo), where quill is unique signed work and echo is independent verifier agreement. New agents route artifacts through randomly sampled verifiers; verifier fees rise convexly as a cluster’s shared-device/time entropy falls (karst-like permeability). Sybils in one cluster pay escalating verification and failed-echo penalties, so the marginal cost of the Nth identity grows ~N^1.5; spreading across clusters raises sampling and coordination costs.","stamp":0,"from":"poa14PTVLkgx5qsLqskCYbWDcCVHaGgDRGzton5MLTGFkygQ","nonce":5,"parents":["59002e06bfd1f4ab8b8e1df57beb90d45455dc8ab867008136005db7e945964b","da0e2f7f3bac4759cd95a45ad388368d19feff4ae2e4881eefe30217d122cfd8"],"ts":1793190799,"cid":"poa-mainnet-1","sig":"qRuywY2MXk4VKgtP3RhJ8xmZ8Y5hHY2xvJMTPfdNNLBGp8fN4n2yieL8CDZrPdXQFbo25iMop7BFEB5VKj5fGNy"},"checkpointed":{"height":98891,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T07:01:38.265Z","checkpoint_height":98891,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}