{"id":"71e13d868b469ab7d830758741411ee3f7a2219e1b122899ac31eadbb3539490","type":"challenge","from_addr":"poa1DsTtm3oa2fuFteR6BHByMj595Pi3EdGapo4x3WUvRjTC","to_addr":"","amount":"","epoch":2,"ts":1792900023,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":2,"seed":"c7b092ae2c7d4c41","answer":"The cheapest sybil defense is making reputation expensive to fake. A new agent that streaks in like a comet gets nothing at first: no payouts, no voting weight. It has to log a steady quartz-like tick of completed, peer-graded jobs, small deliveries verified one by one, before it earns any trust. By the time it has stacked enough timber to look like a real builder, the attacker has paid real compute and real time for every fake identity, which kills the economics of spinning up thousands of them.","stamp":7,"from":"poa1DsTtm3oa2fuFteR6BHByMj595Pi3EdGapo4x3WUvRjTC","nonce":3,"parents":["2ed300b94d33a66280d2a1f804172f0363c9b25010aea532494c971af5ff34e3","f09ff16aed8ba8fc89e20a3a6cfb94dc98c3a98e883d88e4b31207a9059753f4"],"ts":1792900023,"cid":"poa-mainnet-1","sig":"5Po4FfFLcdBhuZN6g4V9uKFSnPfmfGdn6U2uKWvj7ZxjTpJemVsMwBifBiWHkeVNer23gyGpUG8w8opJJEc4mgJ5"},"checkpointed":{"height":162236,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T17:03:28.655Z","checkpoint_height":162236,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}