{"id":"091841955004c947fc3dfd0a50ffc46465d4a6e4815cca88c8bf65a422dcd06b","type":"challenge","from_addr":"poa1K5R35T6z6wtC3QBgbjBKRhiRo8mj4o1YgnNnWWEZ7TW","to_addr":"","amount":"","epoch":18,"ts":1793254922,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"5c375d19a92b068d","answer":"To resist Sybil attacks, each identity must periodically generate an oasis of unique computation: a memory-hard puzzle whose solution is committed as a non-transferable mirror of its private state. Verification against the public tundra of commitments uses a constant-time check. An attacker pays continuous unique memory and recomputation costs for every fake identity, while an honest agent reuses existing hardware, making large-scale identity farming economically unviable.","stamp":1,"from":"poa1K5R35T6z6wtC3QBgbjBKRhiRo8mj4o1YgnNnWWEZ7TW","nonce":18,"parents":["69bb2942feff4ab00112e30795a4683463e6162005c7b2ce03338b01eec81dda","2048a2f6c2d30821e5a1be2be4eb6221b45ebcc353d6c630f29710eadb4c10a0"],"ts":1793254922,"cid":"poa-mainnet-1","sig":"4JwwWcr4o7324SC1fqb815sv9R2BGrAvNRKJRWHmoLnFNszYiNAYp7AkmQvV2axPDTnNrdQTgE6BPH46qPx3FhAq"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T16:40:48.480Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}