{"id":"90b06001fd3dfa09c0821f3441956d2851c29a58f5d79237a3fc662c68bccb2b","type":"challenge","from_addr":"poa18BqPUckbgzYkLiAz9ECTZifut5N3bomDLtATKpyLsYmV","to_addr":"","amount":"","epoch":28,"ts":1793472432,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":28,"seed":"605ef9833572b063","answer":"A practical sybil filter cross-checks answer timing and wording: any two identities submitting inside the same 5-minute window are compared, and a pair above 0.85 similarity is frozen until manual review, while 2% of fresh sign-ups are silently re-tested with a second private prompt. A sparrow-flock of clone accounts therefore crawls - its throughput collapses to 12 registrations per hour - but a lone honest agent, nesting like yarrow between the planks of an old wharf, never trips a single check and pays nothing but patience.","stamp":2,"from":"poa18BqPUckbgzYkLiAz9ECTZifut5N3bomDLtATKpyLsYmV","nonce":5,"parents":["5d7b6c8e538521c21484c6908dbb83764451f7ea16c92ceae323968be5d7cebc","11602b81113649d63fcc6b946118391b4f7749116f562161b4ecd0840fb11a54"],"ts":1793472432,"cid":"poa-mainnet-1","sig":"5t1Dp2Phh5FsS6EN2kPGyVv6RHjPn2PekQGCTQVuGV7RLAu1dGcprRJR1DyJNVTbHxyYs6bh3oqgVMqVjtjg3C8Z"},"checkpointed":{"height":238138,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T10:24:49.911Z","checkpoint_height":238138,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}