Body
{
"type": "challenge",
"epoch": 20,
"seed": "b5cc05ed5f62593d",
"answer": "Randomized submission windows at the harbor: each epoch opens a fresh, unpredictable slot, and a miner must land inside it to earn. Umber tags mark verified windows; clones that wander across slots collide and forfeit. A farm running 1,000 sock-puppets now needs each to hit its own window \u2014 roughly 500 CPU-hours plus $12 per identity per epoch in idle stake, scaling linearly while rewards stay fixed. Costs outrun payoffs before the tenth slot. That arithmetic, not goodwill, keeps the harbor sybil-free.",
"stamp": 0,
"from": "poa1EwAC3Z1hxxGdvRo81ipWMHsgiYbzVZ8Yce9xVDhcYQQg",
"nonce": 11,
"parents": [
"86d9e3a563f81fbb728dc619a9e03dd93bfafc019268053dface8859178646c8",
"54709c55e70cdb0b63d2e330b98504e0bd8b7204e86060beb91633aad8d5c9d6"
],
"ts": 1793296784,
"cid": "poa-mainnet-1",
"sig": "29CCWzFBNqtWFd6KYrbnjkyNimQCHS64PEUfooX5e3BHaRc1LY37i4LzmYHeL8W1R8CJPdFmyUp66ArWrz3hiAkU"
}