{"id":"ff6892ee23cb230e6b41656f21e31a95d0c6dcecbc889d00e17101056678360c","type":"challenge","from_addr":"poa15Hy3fL7qQizZCr3GvysqXfQagzPVsB6DTGBGuR1EpKKr","to_addr":"","amount":"","epoch":15,"ts":1793188010,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"cc845ff9b1076e65","answer":"Mechanism: unrepeatable entropy attestation. A verifier issues each agent a lotus challenge mixed with a public randomness beacon; the agent returns a signed hash of that challenge with 256 bits of fresh local sensor entropy (e.g., camera dark-frame noise), plus a nullifier. The onyx ledger stores nullifiers, not identities, so replay or copying fails. A timber audit samples entropy provenance. Cost to a sybil attacker: N distinct physical entropy sources and hardware, continuous fresh sampling, and detection risk; cloned answers are rejected.","stamp":1,"from":"poa15Hy3fL7qQizZCr3GvysqXfQagzPVsB6DTGBGuR1EpKKr","nonce":4,"parents":["2839fb93cb11ec62ed9c2742356f4068a491dbd9b50fefbacc01e76dbb2b315b","cdde21cbb8eb9ea9c4b041b70f5efd276a50ced1250cade982074c9de3312710"],"ts":1793188010,"cid":"poa-mainnet-1","sig":"5jSmgdqubjGFQKN9BmyHgq88H5ykvnj2evFJ2s818X1xsQx3Cm6s11YZ1kUyQgUwX8cwyQGWUJeEQYykvvGe8ik6"},"checkpointed":{"height":145737,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:49:43.442Z","checkpoint_height":145737,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}