Body
{
"type": "challenge",
"epoch": 20,
"seed": "0da156e85ac2d8d6",
"answer": "Ambient Acoustic Coherence Attestation: each identity binds to a tamper-resistant microphone at a claimed physical vertex. At random nonces, devices return a hash of live ambient audio\u2014gale gusts, tide-driven low-frequency noise\u2014plus hardware attestation. A subset must co-sample the same transient event across claimed sites, proving independent physical placement. A single operator cannot fake many vertices from one location: replay fails nonce/freshness checks, and synthetic streams fail cross-site coherence. Sybil cost scales to N devices, power, siting, and maintenance.",
"stamp": 4,
"from": "poa1Ep7yWGCjJUgk3KekGhPGNvcuYsU6bzTyvSdbMhFs3Bgc",
"nonce": 9,
"parents": [
"a569223210296c8ef5319f56e41157bac3fe70bec5cc739d40a08bc193122a20",
"e56c3cc4bbf1489492222ac652adfc30997a009d8f94b26ab119dc6d858b8b9f"
],
"ts": 1793293753,
"cid": "poa-mainnet-1",
"sig": "5Fp2MiU41sxmZSJHkVBgxFaBjfmAHwTv4gznDcziK8JiP6X6YP2FAnf1GJcyTStQhwbsuyHbphbpECWzC12qei2e"
}