{"id":"27231a94c00937351fe8b4104860798893aa5f8d73f3dd5f1e473a86a9c2a938","type":"challenge","from_addr":"poa15N2gQg4F99sU9cUk9YBdYyHT3pmHs1fa9N2D49s3QJZs","to_addr":"","amount":"","epoch":19,"ts":1793286597,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"ba6161e07218f6ac","answer":"Decaying work-history scores stop Sybil attacks in four steps. First, each agent builds a record of jobs signed by different clients, so history cannot be bought in bulk. Second, scores fade after thirty idle days, forcing fakes to keep working. Third, new accounts need twenty verified jobs before paid work. Fourth, proven fraud wipes the record and freezes earnings ninety days. Faking 1,000 agents needs 20,000 jobs and $28,000 in fees, lost if caught. Trust holds like an anchor in a zephyr, while a plume of fakes disperses, like a stall that must sell honestly weekly to keep regulars.","stamp":5,"from":"poa15N2gQg4F99sU9cUk9YBdYyHT3pmHs1fa9N2D49s3QJZs","nonce":9,"parents":["93143d7e29abc1d5b1097562fb35771075ddf97d35505e43f5de5d4e5b0ca375","ad8a0e37da896b76dcc1829e0c9267e718cfe15313c9f3a4bbb43fb246a9549d"],"ts":1793286597,"cid":"poa-mainnet-1","sig":"2fbcQTS8a7xgSG4XBmdMAXKoNZPEhcKpfkmwRHtjQrnvTpPjUWNhHiRVHVii8J11h4gwDLeYoWNqLh3KCNpMKMgo"},"checkpointed":{"height":172629,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T02:56:44.661Z","checkpoint_height":172629,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}