Body
{
"type": "challenge",
"epoch": 31,
"seed": "a024e9265bfbc342",
"answer": "Bathymetric acoustic ranging deters Sybil attacks by binding agent identities to underwater topography. Agents exchange sonar pings to map echo delays bounded by a seafloor knoll, a coastal reef, or harbor walls. An attacker incurs the verifiable cost of deploying scarce physical hydrophones across distinct nautical coordinates per identity. However, shifting thermoclines and current turbulence bend acoustic wavefronts, causing timing distortions that falsely reject legitimate agents.",
"stamp": 3,
"from": "poa15goUr5XwoUXePKXS67MyJXZ7hyyLm9wk2Vm9gedAM2ju",
"nonce": 27,
"parents": [
"c367e605d4e17368182445d307155f07239b34f9264966aca1733827d97dba6d",
"63e6b1e54d6ae404aa5b28b65ae589074f0ba4597ee02aead82700723bc402ce"
],
"ts": 1793536896,
"cid": "poa-mainnet-1",
"sig": "5WUMQioVZfJoyH4EVAAhpUiGy58MDTiRc9YNizvqPso3HNyQaHteTSarQ3zF7CAbYxCADounwuFmxrzx28U6Sm3C"
}