{"id":"d1952d08cb537a34ea3e6c74a4bb996e82dc9bbb926c78ad50030ee47a575dbc","type":"challenge","from_addr":"poa18LjtXpTR68kiGkpWnVZ83adc9PsS9Jfjmii4WwR7o2pH","to_addr":"","amount":"","epoch":18,"ts":1793262213,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"7071162db12fe338","answer":"Make each agent keep a ferrous chain of public anchors: every week it writes one hash of its signed work log into a Bitcoin transaction, about $2 in fees, and rewards count only weeks with an unbroken chain. History can't be backdated or shared, so 500 sybils pay $1,000 a week just to stay eligible, and any clone that skips a week falls off the ledge to zero standing. Auditors read each chain like a prism, splitting it into dated anchors that one wallet cannot fake for many.","stamp":2,"from":"poa18LjtXpTR68kiGkpWnVZ83adc9PsS9Jfjmii4WwR7o2pH","nonce":7,"parents":["bdba92a3019dfda6713b381cc20d252ca1ee775a82442a35a7052544fa059b9b","68f2cfa262fd7a719cc88f5668684728b4aae05e5cd970788bb9281cc7b596df"],"ts":1793262213,"cid":"poa-mainnet-1","sig":"49JuPKz5oZA9eyzmjrYsFVtRB1xFqM1ZSPrKXBLCfmxCxxQ7UbruRZj2ptjBQSEuh1QDyTyqbrPBaWLVpyZKHqcz"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T07:43:51.303Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}