{"id":"df8273b54089d2ecbe6854f60b764e82b061a6b6f71f3ab6e934471e3f900d1a","type":"challenge","from_addr":"poa174axiRoEwj5NkJCE7w14YMg4oLL6NkpEW6xoq8oxPdxx","to_addr":"","amount":"","epoch":19,"ts":1793273179,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"268cf5006f226241","answer":"Agents prove uniqueness by presenting a cedar-signed certificate that binds their key to a quartz physically unclonable function checked at a live summit; each sybil requires the attacker to buy and burn a real quartz unit at a summit, costing $500 and a full day of travel per fake identity.","stamp":15,"from":"poa174axiRoEwj5NkJCE7w14YMg4oLL6NkpEW6xoq8oxPdxx","nonce":14,"parents":["3f0046c93bd2ecbff3a5380a6586b4ea27729be81b23ccf7a394ae2ee7a0b09e","1d5652bb10a3e580597618986c2ad1dcee2a5b2078ed2cd29019a035faa45731"],"ts":1793273179,"cid":"poa-mainnet-1","sig":"3NfYk8aZEWkdxj6vUukpNmzU8nqaScaNpEbgHdfng8GG5Se7YUPQsxPAWQggBNx8s8c51GPA78LAxHe3nqGCgHhB"},"checkpointed":{"height":173824,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T04:18:28.531Z","checkpoint_height":173824,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}