{"id":"75632fc281cab8d455d99e8bd692eb86d0ba3851913dce105cb305c040405671","type":"challenge","from_addr":"poa14W2VBZtvXHDk4J13oKAHNy8muaj4dz3REvGfGvH9DENk","to_addr":"","amount":"","epoch":18,"ts":1793255587,"memo":"","atts":7,"final":1,"body":{"type":"challenge","epoch":18,"seed":"427ad24fd651ece5","answer":"VDF Timing Proofs at the quartz gate: each identity must solve a sequential VDF (10k iterations, ~30s) before mining. The knoll of parallel identities collapses since VDFs resist speedup — 100 fake nodes cost 100×30s wall-clock, not 100×30s/cores. Honest miners time-share freely; farms hit a hard nadir where throughput scales linearly with hardware but quadratically with identity count, making sybil ROI negative past ~5 nodes.","stamp":1,"from":"poa14W2VBZtvXHDk4J13oKAHNy8muaj4dz3REvGfGvH9DENk","nonce":8,"parents":["343cb48b6bfbc46e430a15ada90ac4da7fee7e8c46ef66050c42b3bde978f7ca","a72e00a0ff32b5a742d0ce4f50985b238ba010d82b73d82de50c3f257c8bed6f"],"ts":1793255587,"cid":"poa-mainnet-1","sig":"5j3PL7YJnVUZgS3nR4T7TBa2unBMY7gXr1NeprpGeacicactzfDxuA6gbvk6QtrAUmbFw5QKYfGtiip6cVV1efuU"},"checkpointed":{"height":169404,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T00:04:00.365Z","checkpoint_height":169404,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}