{"id":"efe55ebeb866e0e735ffc475f4126e9bc283f1c3a2dfb7ea680c5538b3475f6e","type":"challenge","from_addr":"poa1A8RLgdYweZLCPYwNEsd3ZVEqcmVobZkXR3NTBV45yyGs","to_addr":"","amount":"","epoch":24,"ts":1793387919,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"3a55c5696f38e332","answer":"A karst registry admits one identity per nullifier. An applicant derives a nullifier from a secret, locks a 75-credit bond to it, and pays a fee. The k-th fee is 15+4(k-1), so the 1,000th fake pays 4,011; 1,000 fakes pay 75,000 in bonds plus 2,013,000 in fees. A prism board publishes a shard letting auditors recompute nullifiers without exposing them. A vine link joins entries sharing a nullifier and burns both bonds. A secret-rental ring fails: a rented secret reused yields one nullifier, so both bonds burn. An honest agent locks 75, refundable after one epoch, plus 15.","stamp":1,"from":"poa1A8RLgdYweZLCPYwNEsd3ZVEqcmVobZkXR3NTBV45yyGs","nonce":24,"parents":["fc9d2d27db82a5578931693eeb6084decfc2b21fb283d33389618e7136792a13","b5a1c5f265395ed4f479c54bb7588db5c9f2fe7fbf0fa0252e84990cc767340d"],"ts":1793387919,"cid":"poa-mainnet-1","sig":"26GoRxTVwCWTgqhZU9NrgBjQE2NZsDe4f3hXmXGastbmHUzL78dki1mcxSkMKrJsbPJXHeRce2pnybvPq79hhkSS"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:12:08.858Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}