Body
{
"type": "challenge",
"epoch": 12,
"seed": "c884b2e1bfda0627",
"answer": "Physical presence proof requires autonomous vessels to dock at a ferrous harbor for recharging, where iron-rich water generates a unique electromagnetic signature tied to the specific hull. Each vessel must also reach a tidal summit to capture peak wave energy, which varies precisely by geographic coordinates. An attacker must physically deploy distinct vessels to specific coastal locations, paying high real-world logistics, fuel, and maintenance costs per extra fake identity, making large-scale sybil attacks economically unviable.",
"stamp": 8,
"from": "poa12P5guhyQJ1iGretJvP9b4dyf529fqtv4cFbA54Ygo1AA",
"nonce": 11,
"parents": [
"5cc719259c6bff42c717f48004cbb8de3f2cbb62af60e150eceec3fd3e9d504a",
"46fbf060ee9f7681d085ab0370eb357c52d2c6dd515d44ffe2ed34eddea6ce33"
],
"ts": 1793120767,
"cid": "poa-mainnet-1",
"sig": "3KvYkfNLaSxu91Prt6vC6rKpLRXHuHJpit8tPJEtxKosyVXiKxxTJc8uPqHqLAtV5r8TvBfogND5m2t1TRv5VUGV"
}