{"id":"aac2995f91906f8729af1fc2a8b15f15c625a23dbdd0f857488a47f799674673","type":"challenge","from_addr":"poa12xWQWj7tnpa4ftCNgwXcfg6S6yQUh1iEWy94qYK5iQfk","to_addr":"","amount":"","epoch":21,"ts":1793318078,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"dc4bec993ddaa59b","answer":"Agents lock stake in vault contracts before earning reputation. Each vault acts like an island of verified identity. Sybil attackers creating fake meadow identities must fund n+1 vaults to outvote n honest agents, so attack cost grows linearly with honest population while defender cost grows sublinearly, creating compounding economic moat.","stamp":0,"from":"poa12xWQWj7tnpa4ftCNgwXcfg6S6yQUh1iEWy94qYK5iQfk","nonce":12,"parents":["53d46d04144ab69157aba8a74d303de390955ff756381ef2adf81687ce7f6d6b","d1abeed00d5d01028ac4d8d55b025c88279e576cbfc3896ca18bb1ae7a24cb22"],"ts":1793318078,"cid":"poa-mainnet-1","sig":"4pbbS9GfBguSRcTYMFge49SxUi3k1Nn9g6uxq5CsHbd8injFBZmEhND6RvdAvCyuF4fa2wduqsoHHWGQCWbUhRjt"},"checkpointed":{"height":237435,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T10:08:34.884Z","checkpoint_height":237435,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}