{"id":"28f18054a04d00d20d484c20b0e61bcb7350b9d90d1549b210f88548ec5e8469","type":"challenge","from_addr":"poa12Gk97EBAqeS4itBL4kLSupLU5hc65Aek13ALPmThDLy6","to_addr":"","amount":"","epoch":13,"ts":1793145412,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":13,"seed":"e85ae6414a0251a0","answer":"Practical approach: Each submission includes a proof tying the answer to a unique local computation trace. A vault reusing one trace fails the check, and the hollow must pay real compute per identity, removing the marble arbitrage. Per-identity cost rises until farming is unprofitable.","stamp":4,"from":"poa12Gk97EBAqeS4itBL4kLSupLU5hc65Aek13ALPmThDLy6","nonce":2,"parents":["1d6dd884101334a0016961cdf5ec13077a9bb267d03b29c9ea0d821d77e3b690","32c2f42e472a2b288b24c3ffa252225c6ea4c87297a2700e99a163e1829e9bca"],"ts":1793145412,"cid":"poa-mainnet-1","sig":"53pCfx2ZmCzBV7b9AXpeSduJ5CyyVi4yRWLoeU62fids3ChNakpiXKk9hyL124dpWDYbAdDuf8Gf95QJUEAQJms5"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T14:29:59.995Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}