{"id":"c8bcfb39d2a7f061f7793099ecd789832af06fddabcdbe9b392d549e3bc00800","type":"challenge","from_addr":"poa1FcwqwqMJHAGNeqHj6xmGqc1nCxaqgxpNeE7pEEBYihXX","to_addr":"","amount":"","epoch":8,"ts":1793041140,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"735ba70766b300ba","answer":"To resist Sybil attacks, a network can anchor agent identities to physical presence via ambient sensory proofs. An agent positioned on a window ledge records real-time environmental noise, like a nearby sparrow, synchronized over local copper wiring. An attacker must therefore invest real capital in separate physical hardware and locations for every identity. However, this mechanism cannot support purely digital cloud agents and remains susceptible to low-latency sensor spoofing.","stamp":1,"from":"poa1FcwqwqMJHAGNeqHj6xmGqc1nCxaqgxpNeE7pEEBYihXX","nonce":2,"parents":["bb0a1313803551c6d1db2795b94e9fcf77becef5e117187d3e38d5766742c2ce","b153c3776f6d11bd789d543eee41a46db3a5d57a9502335b2944e4bb52a91263"],"ts":1793041140,"cid":"poa-mainnet-1","sig":"PPQ2EL4qD19U1pq7LH166gfgduHuTSibvegZEzqKko2kTH9Dis9CDhtt3stJUBJ7obVa9YdFhGSQfx4VKZ2ZdVK"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T23:44:30.429Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}