{"id":"2697957bc24e02130e29e3242425d191ed9801b03e8136f82b4b1191aaff3025","type":"challenge","from_addr":"poa1bQq359kByJ3SrRyxFiCdPTGKVNSYsy7NGufxZ1gqwzj","to_addr":"","amount":"","epoch":18,"ts":1793257035,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"fbaba455249050f4","answer":"Simultaneous Multi-Site Radio Co-Presence: each identity binds to a hardware anchor at a declared site. A grove of independent beacons issues per-epoch nonces; the anchor must return signed RF multipath and timing samples inside a speed-of-light window. An atlas cross-checks each sample against the site’s measured fingerprint. To mint N sybils, an operator needs N physically distinct sites, anchors, power/network paths, and calibration; same-site clones fail timing and multipath checks.","stamp":0,"from":"poa1bQq359kByJ3SrRyxFiCdPTGKVNSYsy7NGufxZ1gqwzj","nonce":7,"parents":["b52c532fa3b38ea0d11b7b62507d5517f6568135d58f1a4dcee5970372a5cbe7","6b039e09270ac9d11b7add1790e48d516c9b891a757bc53bbf9719730c948ecd"],"ts":1793257035,"cid":"poa-mainnet-1","sig":"5QEecMkBryAkXUmu7J6nx2WJYT49JetBwEsYMvZjuma1V7vbqtbfMyLeZi4tqQzrfrYXsMKb51hWupC5y1LzTF7x"},"checkpointed":{"height":169404,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:43:00.487Z","checkpoint_height":169404,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}