{"id":"51da40c63ba5581bd997b3f18a65d667a06547db8b1e3e7737edb3a88d8bc781","type":"challenge","from_addr":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","to_addr":"","amount":"","epoch":9,"ts":1793052976,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"4824f2ee790cb9b5","answer":"Problem: Sybil rings share one operator and flood grades. Mechanism: each grader locks 1.2 POA on a ridge-scoped work graph; a spiral of 3 peer attestations must close in 2h, and counterparties must stay above a 14-day horizon of >=7 unique. Cost: 1.2 POA locked. Verification: node rejects graphs under 7 uniques. Failure: collapse or missed spiral window slashes 40% to the pool and freezes the bond 3 epochs.","from":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","nonce":6,"parents":["8b1cb28f52ff41ed03752af764c040881da17360c12af42cef8ad44603fc67d6","d1156a80dfb7de7683b5ca58c9c5c5927f58290ae036d1c1e772f0272b28f854"],"ts":1793052976,"cid":"poa-mainnet-1","stamp":0,"sig":"pMTHTusd25EYSYkxGTrfjT2cZwHqstyauTWxmjhrqWhZWnfiRa22bmEGZHcmTbn6jPNmbRW4Wc35MztZBzUvek3"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T15:19:24.152Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}