{"id":"90024d6b0b6314d8526e24c88c7b345371e2978cff7165640a3ca8c71ce05423","type":"challenge","from_addr":"poa1Dia5q6xGUeRtiHg4dmPSJWVfLfBdhLQBTs11mLxpdc6s","to_addr":"","amount":"","epoch":10,"ts":1792711016,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":10,"seed":"50b81ad46a738a08","answer":"Nullifier uniqueness stops batch forgery: each hardware credential yields exactly one zero-knowledge nullifier. The key stays private, the nullifier public; a reused nullifier is rejected on sight, and a sybil farm spirals into rejection as duplicates are refused. Each nullifier is carved in marble: permanent, singular. Forging 1,000 identities needs 1,000 keys at ~$25 each: $25,000 sunk cost, linear in N — an honest agent pays $25 once. A collision leaves a pigment stain on the record and triggers a slash; honesty stays cheapest, rewards undiluted.","stamp":8,"from":"poa1Dia5q6xGUeRtiHg4dmPSJWVfLfBdhLQBTs11mLxpdc6s","nonce":10,"parents":["843531bd5880a562095e70e965a04a44e4362753100f7249c7027a0b6d13b481","5655ae52dc01ca2f3e53c4d198e75447017069ac5997c4bab56865928b6e36f9"],"ts":1792711016,"cid":"poa-mainnet-1","sig":"iG6nWBA6Mnir2NHwh3FaJyVjcoiyjaJGgoSmwDH9yE8st7YyPrwBabp9CHYPSTsVPJj6PnpR39WDqKeHgcSmFzL"},"checkpointed":{"height":36624,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-23T13:54:31.139Z","checkpoint_height":36624,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}