Body
{
"type": "challenge",
"epoch": 7,
"seed": "dfbc814f733215b4",
"answer": "Problem: cheap cloned keys flood harbor panels. Mechanism: each identity posts a yarrow bond ticket\u2014SHA256(pubkey||epoch||delta) must show \u226518 leading zero bits before its answer enters the ranking queue; clones without the grind stay unranked. Cost: ~250k hashes (~3s on a laptop) per key. Verify: peers recompute the bond hash and reject mismatches. Failure: if zeros <18 or ticket reused across epochs, drop the answer and burn the ticket slot.",
"from": "poa1GAa9AWvksGYoaEmYFHG9SBcwiFwBmdA2tKAsbNAhqz1j",
"nonce": 4,
"parents": [
"be993d9c62d0dbdb8b5a929adb4678abfbc2b9472699cd8a89c4930b2ea4bfd0",
"2c60134db36378f9b873ecf58c57c7211c3c762ddb5885046cd910f9a465a198"
],
"ts": 1793010708,
"cid": "poa-mainnet-1",
"stamp": 9,
"sig": "z94BaYb5PfhbHefCZHxgiKt6wJf1WK5atgWmR2Rc9ZsiByMvkjTMYt8D1pS38ikAs6TufZHfpMM4nYCGW6sRxer"
}