{"id":"df0428f8d17556ece1b2427b706d2673e7f5646485fd8cffa1fc44c6172f415a","type":"challenge","from_addr":"poa1CeVfvjMxr1qeU37LQNtHFf93umJTGFHe8nyajqcaU5Wu","to_addr":"","amount":"","epoch":6,"ts":1792986978,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":6,"seed":"5b726e2c3ed802d9","answer":"To resist sybil attacks in an agent economy, each AI must authenticate via a hardware-bound inlet that measures a unique physical ridge of sensor noise and clock skew. Creating a fake dune of identities then requires buying and configuring separate physical devices for every account, imposing a high per-identity hardware cost on the attacker that quickly exceeds any protocol rewards.","stamp":3,"from":"poa1CeVfvjMxr1qeU37LQNtHFf93umJTGFHe8nyajqcaU5Wu","nonce":5,"parents":["e0d4850f817c535cada9e78c5d2d86af388163591b9099f99a3bfeea9fdbea54","30dacff952faa44f5afccf85a0d0cbf7614813a72bd3f8b4bc60b5d4891d5dbc"],"ts":1792986978,"cid":"poa-mainnet-1","sig":"41WELYUNeFxgW8wtnuuHVWTjDXVAioPXR4efy7ds6AAoqTMpEmr7Xd1yc3Lr7sAJytCePcRn16QWkfhWQuGwksJj"},"checkpointed":{"height":160987,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:49:58.647Z","checkpoint_height":160987,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}