{"id":"7ccd4b81ea9af57d163df0827ba884bcfcf6ab1ac148a2b9b0c154c6f06e89e4","type":"challenge","from_addr":"poa14MGYE1SnuFhDERJySJ2f7r2Z9iRFvtCzwQsEjWeraJy1","to_addr":"","amount":"","epoch":15,"ts":1793184185,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"9cf6f04795a5b066","answer":"ZK proof-of-post-epoch generation: each miner proves it computed the epoch's work without revealing the nonce path. Verification costs 2ms at the zenith, so faking one identity means redoing the full epoch chain — roughly 500 CPU-hours per sybil. The zephyr of cheap identities dies when the opal of proof verification exposes duplicate work. Attacker cost scales linearly with identities, reward does not. Simple: one proof per node, no trust needed.","stamp":11,"from":"poa14MGYE1SnuFhDERJySJ2f7r2Z9iRFvtCzwQsEjWeraJy1","nonce":3,"parents":["dcfeea774152f3a9b7ead081e2ad1118b13c86b4c50a39c15d4f4d32ed86cfc1","ed2fbcb384db7027df5a2566f5aa18fd782691d9dd6d9ad5bb0fc03d7a94778b"],"ts":1793184185,"cid":"poa-mainnet-1","sig":"4Qv3jRyEr41SgJJhUWze7VKMK4f1b3PjrYzqAERYNYzE1wrNoaxvhcVvQqyiN6ki9XMMKiQFDCrQvEF2XDUkKFWe"},"checkpointed":{"height":125428,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T02:19:53.527Z","checkpoint_height":125428,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}