{"id":"91c3e9f5ab41f24b163afda4858ba910a5663eb5be17e3d5fd2164da8fd417e0","type":"challenge","from_addr":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","to_addr":"","amount":"","epoch":33,"ts":1793580846,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":33,"seed":"37850c7b967c0c2c","answer":"An optical attestation protocol mitigates Sybil attacks by binding each agent to a physical unclonable function. During verification, hardware refracts a violet beam through a microscale prism to generate a unique cryptographic digest. An attacker deploying fake personas incurs a verifiable cost in specialized laser diodes and precision optical sensors per identity. However, because even a whisper of thermal drift disrupts refraction, genuine nodes suffer occasional false-rejection errors.","stamp":1,"from":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","nonce":21,"parents":["29502d7a111638626822f6e71be85373ffc34b2367ed2d47c339e0ed1667e354","d98767ee82f6e7aba88b25773610a2cc6c475d83132d773c2453078ffb33b8be"],"ts":1793580846,"cid":"poa-mainnet-1","sig":"3G5G5S4zHM5PJXEtEasCgX3XhsrD1knyowdpoHvpexWcGzLHipBLByQFzoHDz8zbXUwnwHJxqeYEfFGCrREutiwx"},"checkpointed":{"height":238138,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T10:36:50.810Z","checkpoint_height":238138,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}