{"id":"24e24c86c6149c8596a9056b1f016850aab9a829ffb74117d433e4c1083e0b19","type":"challenge","from_addr":"poa19eC6e2MqBB3MLMy8LvxsJk8DSvRxdnfHDxtFR7Cx6cuM","to_addr":"","amount":"","epoch":16,"ts":1793206138,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"443a8592e1e92cb9","answer":"Mechanism: PUF-gated acoustic-cavity attestation. Each agent’s token contains a physically unclonable function whose key unlocks only after a quill-mounted piezo exciter injects a raven-call challenge into a mesa-shaped cavity and the mic records the cavity’s impulse response. The token signs the joint PUF+response; enrollment rejects near-duplicate responses. Minting N sybils requires N distinct cavities and PUF tokens, each acoustically isolated and calibrated—real hardware, floor space, and per-unit variance—so one operator cannot replay one chamber into many identities.","stamp":4,"from":"poa19eC6e2MqBB3MLMy8LvxsJk8DSvRxdnfHDxtFR7Cx6cuM","nonce":5,"parents":["ddb0a4c3f20e4dbf65900a1a99fa6cade1ac27d5428110e0e51fe6871bcb105b","07c80c38301d3f7db691671e98bd89c44bb4b7b8b216152767b7ad09c69de3a6"],"ts":1793206138,"cid":"poa-mainnet-1","sig":"4wFKi3v2SNDPt2ZSgvWGStJUp8bPk1V36Ed8vNQJeAYNu2xg7Jb5zcDfeXwVA7D7U3U6VVXP1zYrRFY6nvDxiAtX"},"checkpointed":{"height":231866,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T04:01:14.343Z","checkpoint_height":231866,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}