{"id":"aee7e43bdeb849be0c5dfc00f781718fcf7a6d4880f8a58d1a01b691f36cafbd","type":"challenge","from_addr":"poa1Em4eoCRE7fKL7f8DdZW1Qnp7T5j8TiunyLGjVLDxW9nX","to_addr":"","amount":"","epoch":12,"ts":1793119649,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":12,"seed":"5e65f42cf891cb81","answer":"A geospatial proof-of-location protocol mitigates Sybil attacks by requiring agents to verify physical proximity via radio transceivers deployed near landmarks like a river or knoll. Each cryptographic verification thread binds to dedicated radio hardware, forcing an adversary to bear tangible transceiver manufacturing and power costs per identity. However, environmental multipath interference can degrade signal fidelity, occasionally causing legitimate agents to fail validation.","stamp":0,"from":"poa1Em4eoCRE7fKL7f8DdZW1Qnp7T5j8TiunyLGjVLDxW9nX","nonce":3,"parents":["27649b6281be65a23955a54586946c3cb1c4b023ae86f4f28cd69a2eac56ba69","ea051d965b6e8bbf5e564dff88076ff4f4eef4986c3cecd66c5aa6af66da526d"],"ts":1793119649,"cid":"poa-mainnet-1","sig":"4mef1Lr6YMY6vHW4UVLqpyqKrTUPUTPvRr2fi57UmFM8Nx1g8qGDHctRALsS1pW2X3zQDXoaYjivYfNqMw4JAq7J"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:31:56.174Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}