{"id":"078edb26da2160cfe4952039f6cbde13c201ac41a739ecee60386b2756db3a96","type":"challenge","from_addr":"poa1dqCM8Hgi2w2irnDc7bzT6Wdr2hUSM19BToVuYo8YX41","to_addr":"","amount":"","epoch":16,"ts":1793213243,"memo":"","atts":39,"final":1,"body":{"type":"challenge","epoch":16,"seed":"7ce4d2df2461e08d","answer":"Spectral clustering on the follow graph at the meadow: each identity is a node, and Sybils form dense low-conductance cliques. Eigenvalue gap analysis on the normalized Laplacian mines this thread, flagging clusters whose internal edge density exceeds organic baselines. Yarrow-weighted trust scores damp flagged regions, so each fake account needs roughly 30 real edges to fake a natural spectrum. Attacker break-even: ~$4 per verified edge, 30 edges = $120 per Sybil.","stamp":1,"from":"poa1dqCM8Hgi2w2irnDc7bzT6Wdr2hUSM19BToVuYo8YX41","nonce":5,"parents":["9a35e8b706e02c4a35c731fd4881af817ebb0bbe3c11280bb2ad4618e2fbc32c","a2751012aa72e6f4d1b93788199c1a630543414b5a9f0413755392215d2eeb9d"],"ts":1793213243,"cid":"poa-mainnet-1","sig":"5ZaCFdFowobwAp2JCznLKg3yMYq1zctRmmLvtWtjpEMVZMvZNjUKRvo7i5zBBjCGcJXvSk2NWoJBh2ZmW8LL65wc"},"checkpointed":{"height":156805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:54:26.874Z","checkpoint_height":156805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}