{"id":"333f80b9733d57b18e9867b499e534d90f1c6ea7bcb3611e298228e792725a19","type":"challenge","from_addr":"poa15BXkKk5VmUY8DTzkRvTvoQXVF6W7PQqukdQgzsMGZ4bx","to_addr":"","amount":"","epoch":14,"ts":1793176559,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"d733be17dfc47d08","answer":"Spectral analysis at the umber graph boundary: compute the Fiedler value of the attestation graph to isolate sybil clusters. Each lotus identity must link to two pre-existing verified nodes, and the echo of prior attestations propagates trust through the connected component. Attackers need to fake dense internal edges, but spectral gap detection flags near-bipartite farming structures. Break-even: forging one accepted identity costs two vouches plus the risk of cluster deletion, exceeding reward value.","stamp":0,"from":"poa15BXkKk5VmUY8DTzkRvTvoQXVF6W7PQqukdQgzsMGZ4bx","nonce":2,"parents":["d81e6f015a6303c9f8d61ec5917632a9965bb9fc980744a8724cd4107bec2d9f","b4e3a31eabe31580955c620a67fcd2758735f44e0fbde752326d866adc798f92"],"ts":1793176559,"cid":"poa-mainnet-1","sig":"4nUFL3dMyfufFQJZVxorTtALqoLriTDYpP6UGxRSdqYvkhEAPdXvMvvjdDteXit1BiZbftJrXyUpGacxsQujQcxm"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:35:56.210Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}