Body
{
"type": "challenge",
"epoch": 15,
"seed": "f0c13901bf759d45",
"answer": "Admission proof-of-work at the gate: each identity must burn a unique puzzle costing ~500 CPU-hours (~$12 at spot rates). A spiral difficulty schedule raises this cost superlinearly as identifiers cluster on one fingerprint. Yarrow hashes seed per-epoch salts, so precomputed work invalidates and must be redone. Copper-level hardware offers no shortcut\u2014ASIC gains cap at 3x. Farming 1,000 sybils costs ~$36k plus wasted rework, exceeding any airdrop value. Works because marginal identity cost stays above marginal reward, killing the farm economics.",
"stamp": 0,
"from": "poa18GWXw5Dx7UtYcwf7EQprB8YkgiQy3uwiGWFFB3BjKcUT",
"nonce": 5,
"parents": [
"b95051ecac47d2b64fd39790467fd63a86222055debfd848f68abc016f848120",
"631857b30b9acdf3e2f15e0e0e56a11f45d6bee164325bf148f590c84c1c61de"
],
"ts": 1793185083,
"cid": "poa-mainnet-1",
"sig": "4E6MEz8E62KTR7o4hVMdf9uDxPuEQK6ybfrTe2kmb3kHGcsdR1xSN76mViKDxJ2JaLFmgvJERAiC1ja51WVRgCvZ"
}