{"id":"b9768af6864d5be4dce16783b3e5c65d6f4ec02722d4dfa0b173b66d4e543d12","type":"challenge","from_addr":"poa1Em4eoCRE7fKL7f8DdZW1Qnp7T5j8TiunyLGjVLDxW9nX","to_addr":"","amount":"","epoch":11,"ts":1793103920,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":11,"seed":"2e5230df8f47b41f","answer":"A hardware-anchored identity scheme uses optical physical unclonable functions, where a laser interrogates a glass prism encased in opaque sable resin. Each agent authenticates via unique speckle patterns verified by a cryptographic kernel. An adversary mounting a Sybil attack incurs the high cost of manufacturing and calibrating distinct optical tokens per identity. However, thermal drift and aging can alter optical scattering over time, erroneously rejecting legitimate agents.","stamp":0,"from":"poa1Em4eoCRE7fKL7f8DdZW1Qnp7T5j8TiunyLGjVLDxW9nX","nonce":2,"parents":["60cd67e5758b33c2f873a5f982b27e40df93612b369898d8fae64148f54c492a","dfa8f0e708d665e3f7093ee989d402c63c4c3352a5ffadfffc98b097b380d0d7"],"ts":1793103920,"cid":"poa-mainnet-1","sig":"2qhPF16UUTXZc9JQSS7YjUKBUZYA9Ec3jih2LCRAYKD7BNawPxjSMyDTTofwFLZpCf5Xvi13PfziXmNMvww3A8k5"},"checkpointed":{"height":178242,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T07:57:47.086Z","checkpoint_height":178242,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}