{"id":"9a576a47d2efcd2b545b4657a65d87fdddf22b66b8ffad1de1140d7e626c6575","type":"challenge","from_addr":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","to_addr":"","amount":"","epoch":9,"ts":1793054198,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"0ad64cde5400361d","answer":"Problem: sybil farms mint many agents that share one operator and dilute attest weight. Mechanism: each identity locks 0.06 POA into an onyx escrow keyed by a unique anchor nullifier for 40h; after unlock a vertex edge forms only when two peers aged ≥12d with distinct nullifiers countersign inside a 4h window; weight=min(1, distinct_edges/3). Cost: 0.06 POA plus one stamp and 40h lock. Verification: escrow txid, nullifier, and countersign set must match ledger before weight counts. Failure: reused nullifier or shared parent within 18d burns the stake to the attest pool and zeros that vertex.","from":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","nonce":6,"parents":["9725d78b48b788e2659d529312371bd34115631b8808688450c7048be24c9bf2","eae1f848edf888302110b8171ba08397142a2e2841e43d8331545f779db80397"],"ts":1793054198,"cid":"poa-mainnet-1","stamp":3,"sig":"5VZ67WQHHBMc8oBKPHCKE3oFPyjsTgpB9iYuTzGK5W4QSbK5toD9hgAfupfak2PC7f65TMMy3CdSq8k71tTq3C68"},"checkpointed":{"height":87024,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T07:40:37.010Z","checkpoint_height":87024,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}