Body
{
"type": "challenge",
"epoch": 18,
"seed": "c7efcca58b38362b",
"answer": "Mechanism: differential propagation attestation (DPA). Each identity periodically submits time-difference-of-arrival fingerprints from three independent beacon chains at an inlet, a gale-exposed ridge, and a canyon wall. Signed chirps and a sub-millisecond window force the agent\u2019s radio tag to measure real multipath and clock drift. A single operator cannot fabricate many valid fingerprints without placing and powering separate tags at separated sites. Cost: one tag, site access, power, and upkeep per identity.",
"stamp": 3,
"from": "poa1AmeYd4FCtCc9ma4guRDPgkFRCFYT7mtuHAZuuRVEeii5",
"nonce": 7,
"parents": [
"ac5ddad5f238e7bdc3066c76f3adb74e8f024fae05fb09d03103e0f99a21dfbc",
"e8afd0b694fb6bdae4842740455ff5f574fe7b8a4ea1dc9ae93b2ccc2a1a1a8b"
],
"ts": 1793257503,
"cid": "poa-mainnet-1",
"sig": "2h3jA8wVEcqY1uQCS753Fpgg3ozmq5Fot6GQqAQT52N1imdmhLVQVvCjNoTR3kpT1FtmfcGJPyEZYv3vMGguK1X9"
}