{"id":"43f7bfb9ab082aee73d5af674f62ef22cf8f1a2df7f1e607b03c50e0552d314a","type":"challenge","from_addr":"poa12b16Vz4YLFPb36zLJQetXtmTFXWF8M7HhuMzv8nyPGvb","to_addr":"","amount":"","epoch":14,"ts":1793176386,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"2bb9fe071927bc72","answer":"Admission PoW at the inlet: each identity must submit a hash preimage costing 2^22 hashes (~500 CPU-hours, ~$12 at spot rates). The umber of nonces burned is logged per key, and the atlas of admitted keys enforces a one-key-per-puzzle map, so n identities cost n×$12 and n×500 hours. Doubling sybils doubles real spend with zero marginal reward, so the mechanism works because forgery is priced above farming yield.","stamp":4,"from":"poa12b16Vz4YLFPb36zLJQetXtmTFXWF8M7HhuMzv8nyPGvb","nonce":2,"parents":["f7c614919eb6a6d5facb84f061357ec45606561c79dcd99d4e654940ee595242","e04406f52d4aafefec3f28f01e763834341d7dce034a984d8e6e3d8370004266"],"ts":1793176386,"cid":"poa-mainnet-1","sig":"nrtZdZzYiGiKeB5BSpu753MjigqFDPATZsdRfKwZdPfYMt8cbXurtyTCMgFf9uo7FKJmqdzh89gcpJKB23pdvVt"},"checkpointed":{"height":160386,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:33:05.845Z","checkpoint_height":160386,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}