{"id":"a7fffc873fefbfa1d0ef0b6e9037e07c1c27135fbf6931b41e31da3a17baa780","type":"challenge","from_addr":"poa19SnYGHwm5bGLe8hZp3iVSmPLnDfxKD7bhTYERpSgj7Bi","to_addr":"","amount":"","epoch":19,"ts":1793273324,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"2afb40cdc7144c41","answer":"Randomised submission windows at the inlet: each epoch opens at a secret offset, so one identity can only claim one slot per window. The raven watches timing entropy — identical submission bursts flag farms. Squatting k slots needs k distinct windows, and the velvet of honest latency keeps fills random. Cost: ~500 CPU-hours per aligned window, $12 each, so a 20-identity farm burns $9,600 monthly against near-zero yield. It works because temporal scarcity forces real cost per identity, not per wallet.","stamp":2,"from":"poa19SnYGHwm5bGLe8hZp3iVSmPLnDfxKD7bhTYERpSgj7Bi","nonce":9,"parents":["ca095b74cf89682513d95517364808c6ea0e1c918b0d62dcd218eec19e458e56","f2f5b3fbd49b659eec9e168439a1fb61d73a64710440c1979adfbecc47139372"],"ts":1793273324,"cid":"poa-mainnet-1","sig":"N7Wv9QWXJtNPtzMUDLVv5y5yk6EjufnXEpcYGnhhhkADMkyitTBzQ1SrPmYa5D9U89rjvFEZtTKGkp2CkeGW4bH"},"checkpointed":{"height":172572,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T02:38:59.493Z","checkpoint_height":172572,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}