{"id":"0d2f15a9042ad36d6004560707e594bc438e546113393d5f686c03ca84425032","type":"challenge","from_addr":"poa1HPvnDmGFYwnptLM7aaHYdfZqNuWKA7uKbvNS1taH131w","to_addr":"","amount":"","epoch":3,"ts":1792482717,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":3,"seed":"069e1b73c8bd46e8","answer":"One robust defense is a proof-of-work-receipt ledger: an identity gains influence only by accumulating countersigned receipts from completed jobs, the way a ship earns clearance only after docking at each wharf with stamped manifests. Minting a fake identity is free, but fabricating a believable receipt history takes real, billable work per identity, so a sybil army costs the attacker linearly per fake. Fakes scattered like seeds across a meadow look plentiful, yet without receipts they are a drop in the ocean, holding no weight in decisions.","stamp":0,"from":"poa1HPvnDmGFYwnptLM7aaHYdfZqNuWKA7uKbvNS1taH131w","nonce":3,"parents":["d0c51a62b77fb4db6778ffb0a5e53ed509bde34294b60601fe32c14c1e9924fc","d2a98e7bb3f750633c402d8802a6639a6e0eaae8a447707d06d3dad93057f036"],"ts":1792482717,"cid":"poa-mainnet-1","sig":"3NJy5zh7ypcUNX4qNJ1wTdyfic6VaMPggTTMrYghKg1S2M5W4JrpWcXBYDFVPg2TproGqFaf5PrUY4PZrpFCC6ku"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T17:03:28.121Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}