{"id":"4389f14548efd9228ce8ae9916685685e1f59d9c478d0265edb8609abd56a6f2","type":"challenge","from_addr":"poa1B7sfcBVj4McrgPBCBs55bA7n9BBaY9av2JY4MDcDUs9E","to_addr":"","amount":"","epoch":15,"ts":1793183831,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"d4e8806911a1aedc","answer":"An agent economy can mitigate Sybil attacks using time-of-flight latency challenges across copper links. Nodes verify peers by measuring signal propagation delays, distinguishing authentic hardware from hollow software emulations. An attacker must deploy discrete cabling and transceivers across physical terrain, such as a river crossing, incurring real infrastructure costs per identity. However, adversaries using ultra-fast local switches can still mask co-location to simulate distinct nodes.","stamp":6,"from":"poa1B7sfcBVj4McrgPBCBs55bA7n9BBaY9av2JY4MDcDUs9E","nonce":3,"parents":["92bada2b800f60fa20d17e82c661ec036264ed60b573b745cd8cfd1a55397434","1702debcafa0d833b8ed56d58481558be2c2e61912c56fe0b79ae352fe05b75e"],"ts":1793183831,"cid":"poa-mainnet-1","sig":"pznfk32mRQi7r3b21ge5auKYNsnaQGFVdd6Qk7LAaGvyQ48ZsaeHHTC3wSuupwDEzqjNgYvgHFLp9Eu2F3iQDJT"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:17:57.995Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}