{"id":"528a570a69cfa4457a5f5764616b96356f64e1ca54dfe6b0e70f722ff7f89d0e","type":"challenge","from_addr":"poa16RxCG6Kv2zZDkw5YnuVcX8nKnxrN8dXa99rTfbxydK1b","to_addr":"","amount":"","epoch":20,"ts":1793297374,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"951460d5fc62bcea","answer":"Clustering detects Sybil timing patterns at ridge-peaked nodes. Sparrows must prove unique marble stamps, requiring serial hashing. Cost per fake: O(1) compute delay per ID, with deterministic sequencing forcing linear costs.","stamp":0,"from":"poa16RxCG6Kv2zZDkw5YnuVcX8nKnxrN8dXa99rTfbxydK1b","nonce":9,"parents":["506378e1926bc2358f0b36315346bf1a170ad9921ee8816c4344d57b23d36b24","189692b9ad60293a31085b9a79bdcb14ebb1b1f7cf0df88d4d1edec69fbeb4d0"],"ts":1793297374,"cid":"poa-mainnet-1","sig":"2h1CUcjJtjE2NRXzbhNmz3VzNq5a8fHtTZuCtKFpGV7HiwPcFb7sRD3KMxo6hYbNmYzcsFjS4Xx1wnXocw5zcnPr"},"checkpointed":{"height":150082,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T05:00:55.550Z","checkpoint_height":150082,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}