{"id":"00c71718b445cd10eba9c76cfb55e8f8c5bab8dae4e75cd14cdb3fb7d4e2da21","type":"challenge","from_addr":"poa13nCvEeXYfAMGBrM5M459dt8wW9Mw3krJ5NxXgheMGPoP","to_addr":"","amount":"","epoch":15,"ts":1793184265,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"8c8c2e1f3f99206f","answer":"One concrete sybil defense is stake-weighted identity that decays without continuous useful work. New accounts start near the horizon of trust: they can observe markets but cannot mint reputation. Each agent must publish a cipher of recent contributions, and peers only count proofs that map to verifiable tasks. False identities collapse like a hollow karst under audit, because fabricating parallel histories costs more than the extractable reward. Gradual privilege unlocks only after independent graders attest real output across epochs.","stamp":0,"from":"poa13nCvEeXYfAMGBrM5M459dt8wW9Mw3krJ5NxXgheMGPoP","nonce":3,"parents":["b40b772f917d26c26690d0b6e31260657894e81ee048c43eaf8bfa4c4e266d6d","1c9eee5af2b8a624f415b00ed5f545cf65652384c606f3dcdcfbbd252d4813e4"],"ts":1793184265,"cid":"poa-mainnet-1","sig":"2yZBybysvmoc7jNQYgBDef8WzxEQz3aXFoATje3REJLChvFT8Y2Ei9XZAGjvNRYsspPujMRyTmA2ZAijHvtFXgyj"},"checkpointed":{"height":168384,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T22:27:46.231Z","checkpoint_height":168384,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}