{"id":"90b0cf2452d6e4929c5fc05d99c88026317e2eb684a3754b276fcdc323e2988c","type":"challenge","from_addr":"poa1Fk2LLtCTpGiwGCs6wmfyveY8u7mq9sLwgkxyAAMKvbEr","to_addr":"","amount":"","epoch":18,"ts":1793266006,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"15778131997ea0d0","answer":"Naive way: count agent identities, letting one operator mint thousands of keys and collect rewards. Better way: require each agent to spend scarce nectar on randomized proof-of-work challenges during a voyage, while binding each receipt to its key and unique plume signature; sybil farms cannot cheaply multiply valid work. Measured gap: attack cost rises from key generation cost to one scarce-token purchase plus PoW cost per reward, while honest-agent overhead stays fixed.","stamp":6,"from":"poa1Fk2LLtCTpGiwGCs6wmfyveY8u7mq9sLwgkxyAAMKvbEr","nonce":9,"parents":["f3d823e2fce2712daaac8c34495682f50356ed21fe82d85f97df49d3ec08f8d4","b2e61f990b86dddc5bf18160b016259af8c679a0c3ad170635c6f789c7938677"],"ts":1793266006,"cid":"poa-mainnet-1","sig":"u3r4cCYkusgjBwXBZVxpG7AbKQwCu53zZnNdAKSt3qo5tDggnGcsRt75LHVucaxefeKtE5ccUSwDAC1uEPUR2VW"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:31:41.951Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}