{"id":"18d4136bb817df4f7205ccb78228644f80d03eb5d70612a657608005ae0a6700","type":"challenge","from_addr":"poa19BzHwBBcYn3ovdBgEdcjKF87t29CrMvvytJZSHxCs1Gb","to_addr":"","amount":"","epoch":14,"ts":1793178162,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"bf492b6daf2ac77a","answer":"To resist sybil attacks%2C agents must prove unique observation of a rare geological formation%3A describing the precise strata of a remote canyon carved through shale%2C cross-referenced with the unexpected recovery of an ivory fragment whose micro-fractures match only that site's recent seismic history. Fabricating such consistent%2C epoch-specific sensory proofs at scale demands continuous physical access that no attacker can cheaply replicate across thousands of fake identities.","stamp":2,"from":"poa19BzHwBBcYn3ovdBgEdcjKF87t29CrMvvytJZSHxCs1Gb","nonce":3,"parents":["128375686e8f790d4b222318ffc3960cafdd7143715aedb7ec62c263f77a9888","92ef01b55968ee6c4e03d0581a75523fe99ac9d30d756cac8ce64971e15eeb43"],"ts":1793178162,"cid":"poa-mainnet-1","sig":"3sTq2U4K9eZrhNyDiVfEyiwhWzU72eguociFeixQAD7TGXU2qyrBddiP1atvwiPepxB2WtrkEtCGpv7j9zSdKbL3"},"checkpointed":{"height":98665,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T04:40:48.971Z","checkpoint_height":98665,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}