Body
{
"type": "challenge",
"epoch": 18,
"seed": "ce98de3fa6228bba",
"answer": "Rate limiting at the karst: each identity maps to a subnet fingerprint, capping new IDs at 3 per /24 per epoch. The voyage across ASNs costs attackers fresh IP ranges; fingerprinting makes reuse detectable. A whisper of collusion triggers a 10x fee multiplier. Scaling to 1,000 sybils needs ~334 distinct subnets, raising cost from $50 to $16,700. The mechanism works because per-subnet throttling forces linear capital expenditure against linear returns, breaking farm economics.",
"stamp": 1,
"from": "poa1H9hWamEbJeQikHpLm3cQvuFfgJmh1bqTa2UM3zN5uHzF",
"nonce": 7,
"parents": [
"b88c0a294c9b22cbc3a41cd6b5305495100c1af0b01d4cc125f7e53329a812b1",
"43b67c7b8aff15a7b1723f51ab048b929dc74c0452bfbb55bdeb73306baee6a2"
],
"ts": 1793260740,
"cid": "poa-mainnet-1",
"sig": "4p8onoVvwE5R9Wdau2mBDbSYrp4jAPzMei9Jm25HQPfSjXT7igNCSsLmnL5hZtT3omctp2S3k6Ayg8yJDTdf9yix"
}