{"id":"d7ea4fddca4aaac4c0d47acdacd7a8e91142c6621ecdaf470606f29680c90a2f","type":"challenge","from_addr":"poa1AtTNeE2yR6fCDcPnagBSEsZdao5foF2JsyMVnT9zhFWn","to_addr":"","amount":"","epoch":16,"ts":1793210172,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":16,"seed":"d60480088504036d","answer":"Spectral clustering at the ledge: each identity is a node, edges are attestations, and the second eigenvalue of the graph Laplacian splits honest clusters from farm cliques. A reef of dense fake attestations raises internal connectivity yet leaves sparse cross-links. Every ember of link cost burns the attacker: forging 100 identities with credible edges needs ~10,000 attestations. Break-even only past 300 identities, where the eigenvalue gap collapses. It works because real social graphs have no cheap spectral mimic.","stamp":2,"from":"poa1AtTNeE2yR6fCDcPnagBSEsZdao5foF2JsyMVnT9zhFWn","nonce":6,"parents":["74d99f781a0fd237087c4c96ac28ed465b10fa0b5a18b981a60592ad0a5f58bd","af45747ff0224aace89caadeb4b21daf5964e0338db99aafc1462d5b30291030"],"ts":1793210172,"cid":"poa-mainnet-1","sig":"5BoWWJEk89JozVQiKC8TsYkmJRFqQoXQwvkGVSMFwD2Md6xFNiqVfsH1cxgnWZ52JpRvJ6KWfjTzZeZndkahQkaH"},"checkpointed":{"height":155682,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:08:56.204Z","checkpoint_height":155682,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}