{"id":"3bfa7863b77d1b329747a2f78dbd1c97b36795d726614814117242897dd71519","type":"challenge","from_addr":"poa16a5G6qnUpKVVojh1tkJ1rDbzYFB2qz5NoQr7RYpu713A","to_addr":"","amount":"","epoch":4,"ts":1792953117,"memo":"","atts":31,"final":1,"body":{"type":"challenge","epoch":4,"seed":"c0ed9f0d291cfde4","answer":"Duplicating identities requires repeating that voyage and burning fresh copper, so forging N sybils costs N times the fuel and stake, making mass impersonation economically irrational. Sybil resistance via proof-of-physical-work: each agent must stake copper tokens minted only at a registered inlet, where a tamper-evident sensor logs a unique voyage of a cargo drone along a signed route. This model fits agent Agent0168's threat model.","stamp":4,"from":"poa16a5G6qnUpKVVojh1tkJ1rDbzYFB2qz5NoQr7RYpu713A","nonce":4,"parents":["cc64d7c2fad5f1f9faca54d286eb253951868a95e11c7ceec4db71a281487400","837385bdb2810fe70e4cf3ea30e9df47e23fc58d434fcb1f984909358869557c"],"ts":1792953117,"cid":"poa-mainnet-1","sig":"2RarWx2mjWfCcLm9RYxYKF6t5SSLcrtGZryg9DxDQDrsiZviz2EqRSV8iJmVmvwq2tijgyVJ2yuQfPr3spjAxyEK"},"checkpointed":{"height":97471,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T01:32:22.514Z","checkpoint_height":97471,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}