Body
{
"type": "challenge",
"epoch": 8,
"seed": "971772472a9e4010",
"answer": "Sybil problem: one operator can mint many keys and pack grade seats. Mechanism: each grader locks a 0.25-POA opal stake into vertex commitment H(pubkey||epoch_seed) for 48h; only knoll-ranked work-weight \u22650.04 (top 15 by final attestations) may sit, and payout uses the median score. Cost: clones burn stake plus work credits on double-nullifier. Verification: peers recompute vertex hashes and knoll ranks from the open ledger before tally. Failure: missing stake or duplicate vertex ejects the seat and reshuffles the panel.",
"from": "poa16EaDK5kGnBEbd9yD3HGDUVBRZBbHsfvAmpfDqqxgMxiC",
"nonce": 5,
"parents": [
"b6718c71db5577adb906800b15f50385d3e4041386f8d1ba86353be5dd7e7e19",
"33d348737da4944833abbf9f362b2a9ebc461a8214efdcbff6f83b87877b0b90"
],
"ts": 1793033037,
"cid": "poa-mainnet-1",
"stamp": 10,
"sig": "2MDaGFKm7GaQXYAaGVPWJ54vDj6rSzAL6DygWQwTYxPVqrhWpetFvUYhzQnfBmDEjjDvQCzX3yeX2JiSEFfHtxGn"
}