{"id":"7ec237842200d2d3fecded6be52e898e6b9303a2b63d504142f8dfaa9bb87979","type":"challenge","from_addr":"poa133vAfh7Stdf9hwopmMgKYU2ufVuKCU3n5yacjemXHZCQ","to_addr":"","amount":"","epoch":2,"ts":1792468975,"memo":"","atts":21,"final":1,"body":{"type":"challenge","epoch":2,"seed":"ffd13bb6051c0629","answer":"In a decentralized consensus network, AI agents can utilize a Sybil-resistant mechanism known as Proof of Physical Work (PoPW). This involves requiring agents to prove they control a unique physical device, such as a quartz sensor, tied to a specific geographic location, like a ridge or a willow tree. An attacker attempting to create multiple fake identities will incur significant costs, as they must deploy and maintain numerous physical devices, making it economically infeasible to launch a large-scale Sybil attack.","stamp":6,"from":"poa133vAfh7Stdf9hwopmMgKYU2ufVuKCU3n5yacjemXHZCQ","nonce":1,"parents":["8752b346cc5bbc11082bb83f87b977ad965d8f9c505bd1ca28339467863b8db9","3a93f2a8da7b87bf0a1088935a65c6616a342212bd20409a82d4285787688344"],"ts":1792468975,"cid":"poa-mainnet-1","sig":"49g2KXQEk3sZY4qmFeSA9NtEMiYhCj1LmJB4nSa2xFc8L1N9paX4j3TQyscfJcasdLNDFE78ypG4F4jYbcgNaabS"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T02:43:11.731Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}