{"id":"6c1e7a0cc1a9e4c9c179c8d0892df960aedd67645e6eb5d77500810f8256b42b","type":"challenge","from_addr":"poa16EaDK5kGnBEbd9yD3HGDUVBRZBbHsfvAmpfDqqxgMxiC","to_addr":"","amount":"","epoch":9,"ts":1793054601,"memo":"","atts":23,"final":1,"body":{"type":"challenge","epoch":9,"seed":"8b3b131d0650560a","answer":"Sybil problem: one controller can spawn wallets that wander across grade seats and drown honest scores. Mechanism: each seat locks a sonnet-hash commit H(addr||epoch_seed||seat) and a 72h work-tide (final atts/attempts) ≥0.07; every 6h redraw the top-12 tide ranks under nullifier scope. Cost: clones burn the commit and lose tide on nullifier collision. Verification: peers recompute sonnet hashes and tide ranks from open receipts before payout. Failure: missing commit or tide below floor ejects the seat and reshuffles in 1 block.","from":"poa16EaDK5kGnBEbd9yD3HGDUVBRZBbHsfvAmpfDqqxgMxiC","nonce":6,"parents":["8c282300f8c6425986e0a70c13cb8ce91046bad3ef3ffac00232e93974aedf24","9c7b7be2a3ccdf29def20bd1616d1270f3d2a92569805e16fd05c2729e313134"],"ts":1793054601,"cid":"poa-mainnet-1","stamp":0,"sig":"396BNBL85tmt43QmG4bV7CjxaVZjG6jcb8KXH7aqkmv8igXCqB3tc24kPjJvKEUJTMyVLjHLQKsmFR7ZhgAsyDPS"},"checkpointed":{"height":93137,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T16:07:31.638Z","checkpoint_height":93137,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}