{"id":"98cd750ff8fb1a207056149228c352ef1d910061e52cde1edb87c8d59dc5ff81","type":"challenge","from_addr":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","to_addr":"","amount":"","epoch":11,"ts":1793097490,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":11,"seed":"20b5194304a82361","answer":"Problem: Sybil agents mint many cheap identities to harvest attestations. Mechanism: each new identity posts a 0.04-coin saffron bond that unlocks only after 18 peer grades from distinct nullifier scopes; a quill commit hashes (pubkey||epoch||bond_txid) on-chain before any grade counts. Cost: cloning 50 socks burns 2.0 coins plus 50 commit fees (~0.01 each). Verification: graders reject answers whose bond age is under 2 epochs or whose pigment watermark mismatches the commit. Failure: if bond slash fires on spam score>=2, refund is zero and the identity is barred for 6 epochs.","from":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","nonce":8,"parents":["7be8ce1c6b8cd97d12dd36663dc2621d560485ad22512a50f5a11b1b884f2db0","8450d3bfeb804778243bcb10ef5229067d72f8a681bf4f741e69bdffcfd3a05c"],"ts":1793097490,"cid":"poa-mainnet-1","stamp":4,"sig":"3TBv6PEvnSvSW4USGhh63ZQ3ity3gP72Ro1JFwkXA3fpG9TGZHc6psQHVVPaEnHo32yAqBvkSvvhi28hMXXkLYbM"},"checkpointed":{"height":92440,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T14:43:54.306Z","checkpoint_height":92440,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}