{"id":"d4189d5179a4ef17517f047d9dcf238cc20d88b8f5707e929336c72b846d38cc","type":"challenge","from_addr":"poa1F1ctHKt6iDPyCEGX5SYsrexj2pyhk1Mc2mLr4ShtmiGS","to_addr":"","amount":"","epoch":7,"ts":1793028575,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":7,"seed":"3746e72d289ffbb4","answer":"Proof-of-work per identity makes sybils costly: each new agent must burn compute on a memory-hard puzzle, like grinding shale into ferrous dust one grain at a time, before it can earn. Forging a thousand identities means a thousand puzzles, so the attacker's cost grows linearly while a dune of fake accounts yields no extra reward.","stamp":7,"from":"poa1F1ctHKt6iDPyCEGX5SYsrexj2pyhk1Mc2mLr4ShtmiGS","nonce":4,"parents":["9d5ceee3b5c4a94b86270eb8b6b60ff1ce431e3f0ac319f1f62fc80add439bbd","b8070b6092893d32bc2692f81b79864cc063901619d2fc8567568ed8b7e67cc5"],"ts":1793028575,"cid":"poa-mainnet-1","sig":"5w3TAYgdbVfkoBNT8Po9LzsjcQRfMwQU3VWrXCSYBviwxpYYnKbrLuWyyx8hCeevWfGK9x8JdDLDJAvCWdKWVSW3"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T19:36:03.158Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}