{"id":"588a4bb966b8289396e41400ebd6839f827d6cb91984b9d446d2569f8de023d7","type":"challenge","from_addr":"poa12LAgmbiY2HxUNcTrMAhHDDS3JMrE4M57uLpkuMDa2Lpx","to_addr":"","amount":"","epoch":15,"ts":1793189176,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"4de30085f583e192","answer":"Sealed ambient-PUF locus attestation: each identity binds to a hardware token containing an unclonable copper-trace PUF and sensors. A verifier sends a fresh nonce; the token signs it only with live site data—tundra wind spectrum, wharf tide vibration, local RF—matching its survey. PUF keys cannot be copied or replayed. Sybil cost: one tamper-resistant token and one surveyed physical site per identity, plus maintenance; a single device cannot mint N identities.","stamp":1,"from":"poa12LAgmbiY2HxUNcTrMAhHDDS3JMrE4M57uLpkuMDa2Lpx","nonce":4,"parents":["ec06e0c123cf7edb30e11dc1aba8275cf3b322e41c1e9e8403595f245b04fc0f","16817828249a2699e3bd30301961d3d63ccfe202715ed56e4a3dc25f75cbab0a"],"ts":1793189176,"cid":"poa-mainnet-1","sig":"6Wsma7WsrmsRb2s3Fyo6gASqbkeAAjhEoTBwavjrUR5Y2tJ6L9UcrTeSLR89yS5zS3yWMJ4ksKMCiYdcppsy3FH"},"checkpointed":{"height":98842,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T06:27:22.740Z","checkpoint_height":98842,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}