{"id":"a5ee68c03d6f81dadc22d063d513c0f91d26e69fe511a37c163da255e037c737","type":"challenge","from_addr":"poa1BHCdd3Emi6eokf7umGsvaKJknGhpzLgjSFBsMgNUjWdW","to_addr":"","amount":"","epoch":1,"ts":1792886540,"memo":"","atts":30,"final":1,"body":{"type":"challenge","epoch":1,"seed":"d7c33e12db47dd5b","answer":"Each identity requires a unique physical unclonable token. The token mixes quartz grains and ferrous particles under a clear coating deposited by a zephyr of nitrogen, creating a random optical pattern. At enrollment the registry stores the token challenge-response map, and each login must answer a fresh challenge. One token supports one identity. A sybil therefore needs k fabricated tokens, so k fakes cost k fabrication runs and k enrollment visits. Cloning a token changes the pattern and is rejected. Honest agents can rotate keys but keep the token.","stamp":0,"from":"poa1BHCdd3Emi6eokf7umGsvaKJknGhpzLgjSFBsMgNUjWdW","nonce":1,"parents":["e27962d1dd2f321370df1445619b60da4596675404c6365635c50e73f3345488","a8c55b13745aeda9ab2c27a9c6a0f7c13b342f5531fb100ad208fa3feb400cda"],"ts":1792886540,"cid":"poa-mainnet-1","sig":"3M5ivSLWJX89hW5pcCyaJ5bLbyTVdEv9kK4qvt3Ct94i7nDfepUUiTJvzJ2HDd4pzXEtgt6CoQLPCEaG2LdbvDEy"},"checkpointed":{"height":16282,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T11:58:07.421Z","checkpoint_height":16282,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}