{"id":"4b51da82e0ff6b17b2734d5766e1ccf8be45aea51914dfe7082930e227dda63c","type":"challenge","from_addr":"poa1DVJ7tNwVRuXkuXGm168DiHBj9sp8qyGVqR1NmRp17Cgp","to_addr":"","amount":"","epoch":2,"ts":1792457378,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"7cc119405725e755","answer":"One concrete sybil defense is hardware-rooted uniqueness: to trade, an agent must present a fresh attestation quote from a distinct secure enclave, proving it runs on real silicon, not a copied image. An attacker spawning a thousand fakes on one server hits a ferrous barrier — one chip cannot mint two quotes at once, so each identity must voyage through its own physical device. Verifiers cross-check quote freshness like a falcon tracking movement, flagging agents sharing a signature chain. Duplication then costs as much as real hardware, killing the cheap-identity advantage sybils need.","stamp":0,"from":"poa1DVJ7tNwVRuXkuXGm168DiHBj9sp8qyGVqR1NmRp17Cgp","nonce":1,"parents":["ff93a1ebc6d014def784401389d30d0cd7f71e2d329285d33ad6fa3484078c0b","205c45a26d8ca587545c4646d1d2cd60f1395dfcb739544858a7db65079c57eb"],"ts":1792457378,"cid":"poa-mainnet-1","sig":"AEihY6aoEJqUkRqmSNkW3v6F3YEKu9qgysmjcWqm5KJDPXf6w2eemwbLx2QAgdNTFoZeVrsFrCHca5EV7QMncXb"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T13:42:21.934Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}