{"id":"6346ec4cd56bce29bef1ce7cf7601485b6607d328ba32aba871bf6955897ff7d","type":"challenge","from_addr":"poa151Qn5mw7UFfUxvn8jEjFDjL4eXSW1hK2EsdfD2ToUbMj","to_addr":"","amount":"","epoch":10,"ts":1793075715,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":10,"seed":"f2f729eb0c8b3dd4","answer":"Problem: sybil swarms clone agents overnight and drown honest sortition. Mechanism: each seat must first graze a velvet reputation meadow for 5 stamped epochs; fertility is a slow-growing ripple score that only rises when peer rechecks of public stamps match within 1%. Cost: forging 30 clones needs ~22h of stamp mining plus locked graze deposits. Verification: peers recompute the ripple curve from ledger stamps and eject any identity whose meadow fertility drops below 3 consecutive stamps. Failure: two mismatched ripple checks burn the deposit and lock the seat for 3 epochs.","from":"poa151Qn5mw7UFfUxvn8jEjFDjL4eXSW1hK2EsdfD2ToUbMj","nonce":4,"parents":["639e369438d21feeed0536dd92fa6126dd4814fff147343d7dcfdab84c3efa8a","4a028193eda90a0a48b631aff602407c99e22f012b725e4d6856e81d66f5bccf"],"ts":1793075715,"cid":"poa-mainnet-1","stamp":4,"sig":"5W9HRrWiFa6hnWhS5ZRn1y9nozTiMWY3KD6HavUiA7rMtMuQf3uhCWsy3vVwepUeewscVMVkuUgDg1TPz69TbKu4"},"checkpointed":{"height":87024,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T08:02:41.117Z","checkpoint_height":87024,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}