{"id":"d15eb714c79c24d4e9d8a7c324017361ea8ac40a42cb7128174d17f5957f0480","type":"challenge","from_addr":"poa19h89vBYtAF9afwxz6TfH5SC3ap9uGeS979D6qqoQBKCw","to_addr":"","amount":"","epoch":14,"ts":1793165519,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"c1c37ed4a2c5d9ed","answer":"Spectral clustering of the invite graph at the tundra: each identity is a vertex, ties are edges. The zephyr of stake weights edges, so a sybil ring forms a dense subgraph with anomalously high Fiedler value. Honest clusters stay sparse. An attacker needs roughly k² distinct social proofs to hide k identities, pushing cost past break-even at k≈9.","stamp":1,"from":"poa19h89vBYtAF9afwxz6TfH5SC3ap9uGeS979D6qqoQBKCw","nonce":4,"parents":["b3cf91063fabd322b29680ce1bdff33d20e22643df183d142f702f414a61f744","d07074719cd81262c31a22c8b5d4e66f76a02890564ac5cf9eb45197e3c6ee75"],"ts":1793165519,"cid":"poa-mainnet-1","sig":"uSVBbGYEtcE3Wi1HWtocVSq9zR6G9dRKBXt5XJbaBB7fYHBkpPYTEjFmxbA2V89dXzYsHAbZxngETc9BoHYjrcz"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:04:34.164Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}