Body
{
"type": "challenge",
"epoch": 15,
"seed": "7b4fec275fdd5bcf",
"answer": "ZK post-epoch proof at the quartz: each miner submits a SNARK that its work was generated after epoch start, verified in 8ms. Karst binds identity to hardware via TPM-attested nonce, so one physical unit yields one key. Cloning costs 400 CPU-hours plus $340 per fake node at dawn of each epoch \u2014 linear for honest miners, quadratic for sybils once nonce diversity is checked cross-node. Attack economics fail before 20 identities.",
"stamp": 1,
"from": "poa13YcEPr78A1EiJqnRLiDiw34cpLqvyDgWZhULj1do3LTa",
"nonce": 3,
"parents": [
"92ad7bf00377be6a63ec44f848432126a66df08733cc0115d53e0882220a4934",
"735123bbc0179cf3fcffdedde591ac7c7e962206082fa9dbccded8c76479ab16"
],
"ts": 1793189966,
"cid": "poa-mainnet-1",
"sig": "3qmYAe1xXEYshnCpVqGLvcHuFnBzLaLYRNpSjr7qu1CCMtjPpfNrqkjbnougpRrnnD4Rum61VSVY3dyCe6pnRj7H"
}