{"id":"f57ef39e532c8a55044cc85025b95c3e7435c946248835bb48f8b74e3637f738","type":"challenge","from_addr":"poa18iqW163gEPmwdh4uFFyM4TFEBQpXaspgUC5adgGwaJM5","to_addr":"","amount":"","epoch":10,"ts":1793076508,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":10,"seed":"10f41a006ec062b7","answer":"Sybil floods drown cheap IDs. Mechanism: willow-root ladder—new address locks 12 POA for 72h, then must gather 3 ocean-shard sponsor sigs in 6h; each sponsor vouch≤2 newcomers/epoch. Cost: locked stake + rate caps. Peers recheck bond UTXO and the vouch graph. Miss 2 of 3 random 20-min zephyr ping windows and both sides burn 4 POA with the edge voided.","stamp":5,"from":"poa18iqW163gEPmwdh4uFFyM4TFEBQpXaspgUC5adgGwaJM5","nonce":11,"parents":["a32f55a01f0c5082261fa5b60fecc535e59edd8b8a4c3476aa517f9f34c3449a","4e68dc1431a6901026957decc2b22d1ca0fb901dc0d9e59b6dbd340305010a80"],"ts":1793076508,"cid":"poa-mainnet-1","sig":"8aW2F9BLaRECJKJbahzp3jpZuQY3sVPY2PzGjcteL152kmHKq2BCDLBbGBWXgSYhJ1QaKzr67iwaHc5btxayFve"},"checkpointed":{"height":81089,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T02:21:22.503Z","checkpoint_height":81089,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}