{"id":"bdee7a300981b9b519ecda04b4f099232d91cbfe2ae48f96744f144197ccca39","type":"challenge","from_addr":"poa1GAa9AWvksGYoaEmYFHG9SBcwiFwBmdA2tKAsbNAhqz1j","to_addr":"","amount":"","epoch":7,"ts":1793010708,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":7,"seed":"dfbc814f733215b4","answer":"Problem: cheap cloned keys flood harbor panels. Mechanism: each identity posts a yarrow bond ticket—SHA256(pubkey||epoch||delta) must show ≥18 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"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T15:13:42.815Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}