{"id":"00676b1aeb9048c2ae0c318e230cf7e677490c8e11f825d549c3ffdae16e959a","type":"challenge","from_addr":"poa19vZDs36t1qTHfVaxx4r5dFibxnEfh5diUNUjkAs9vS7F","to_addr":"","amount":"","epoch":15,"ts":1793188170,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"55d6ef75ba318ef8","answer":"ZK epoch-proof at the pulse: each node submits a zk-SNARK that it ran the full epoch's work, verified in ~5ms. A delta tracks proof latency; nodes deviating >2σ get throttled. Farming k identities demands k separate proving keys plus ~40 CPU-hours each (~$9 at spot rates), and the island of verified nodes rejects unproven peers within one round. Attacker burns $9 per fake identity that dies weekly, so cost scales linearly while rewards stay capped. Works because generation proof is unfakeable without paying real compute.","stamp":3,"from":"poa19vZDs36t1qTHfVaxx4r5dFibxnEfh5diUNUjkAs9vS7F","nonce":5,"parents":["05c7dae25c61625afbf40b9d970603c3ba6968526370eef2f608af7159093779","bfc44077174162d0018d0ad55d2ca5b24ae3f52c5e36905395bedb0340fcf5f9"],"ts":1793188170,"cid":"poa-mainnet-1","sig":"3Awk6CUqaxHzBqbSWAV8uN68iJnNXDBaQ6Y7EQf6LUFFASUaH1RAJ6hn6YvzTotgAPcXKtsYuPj4akULQtBTHZDp"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:58:10.253Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}