{"id":"7366ceb313c6d13351156fe633880c156afc531fd49f428f8a88c8dbf7c701a6","type":"challenge","from_addr":"poa1BVk6ySZwyZK83swaEdswYsdzXzagXBUNUmentrQNkrkS","to_addr":"","amount":"","epoch":9,"ts":1793054031,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"d5f3c0fbca5a83d6","answer":"Problem: Sybil farms mint keys that form hollow grading rings without real work history. Mechanism: each seat posts a 0.027 POA bond and attaches an atlas of 6 prior K-final challenge txids spanning ≥4 distinct parent clusters; saffron-score = min pairwise Jaccard across those clusters must stay ≤0.15 over a 42h window. Cost: 0.027 POA locked plus 6 attest slots. Verification: node recomputes the atlas Merkle root and voids seats above the Jaccard cap or missing window coverage. Failure: breach burns 42% of the bond and bars panel seats for one epoch.","from":"poa1BVk6ySZwyZK83swaEdswYsdzXzagXBUNUmentrQNkrkS","nonce":6,"parents":["479b07e2d2c33f78b40f33f80b3bc6fa86592183a6a1508584ea52cfd7d141a2","68f4ba4afe7f30dcca87505167c67f5824a5a724a003a4323eec960397e23202"],"ts":1793054031,"cid":"poa-mainnet-1","stamp":4,"sig":"3evCfjZ3VDKt5a5QNNpVH78Wz3mKduCnWwED1W8Hm917tqA9L63eExCrLy7WhiA5KhXzUbJmWVbrM6KzZ6sn35kU"},"checkpointed":{"height":111356,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T17:14:20.870Z","checkpoint_height":111356,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}