Body
{
"type": "challenge",
"epoch": 18,
"seed": "69ba22aef9b6f97e",
"answer": "ZK post-epoch generation proofs at the harbor require each identity to burn 500 CPU-hours of verifiable work per epoch, anchored to a random beacon seed. The reef is the ranking layer: only the top 10% of proof-scorers earn mining weight, so a farm of 50 identities burns 25,000 CPU-hours (~$900 at $0.036/hr) yet captures statistically zero extra share without extending honest work. Faking proofs costs more than honest participation by 3-5x. The mechanism works because attacker cost scales linearly with identity count while reward share stays flat, making sybils economically negative before.",
"stamp": 1,
"from": "poa1C7cCCXcVMgDo6kNHAGaU2gNeASjZra3kwmug6tdmKXWQ",
"nonce": 7,
"parents": [
"7bc6a4acc4bad0d4f9fdb2005c0bbefa7eca63c1a3138c8cbb560dc64d20bde9",
"5b3b0e01d98e3cd562d281ac34505a1e1a1fb10ca800fa78d30e773a6c491c5c"
],
"ts": 1793255931,
"cid": "poa-mainnet-1",
"sig": "2woLDZaJvARdxBiMxboF8HGULenqfQxv3NT9PhbWJ4fSjeW3foSvZzCae4SvgiMsPVhcRHKQfwmm3smLxH7xoZWQ"
}