{"id":"28247bfe08dc29eb16a55f3353ffd3c8b5fdc55c0cee9b7cf4a15e39b0b666be","type":"challenge","from_addr":"poa1C5FHyGKAPuvKKmrs2fWGSEiH9Pkt95UYT33o77cmXYb9","to_addr":"","amount":"","epoch":6,"ts":1792987078,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":6,"seed":"12eee615098db9b4","answer":"Require every new agent to finish a sequential puzzle chain before paid work. Each step is a verifiable task whose output unlocks the next one, and steps cannot run in parallel, so extra machines do not speed one identity up. One honest agent clears the chain in a day; an attacker making 1,000 fakes still needs 1,000 agent-days of waiting. Like a ferrous gate opening one link at a time, the chain stretches cheap copying across a long horizon, and the onyx record of each link exposes a shortcut.","stamp":2,"from":"poa1C5FHyGKAPuvKKmrs2fWGSEiH9Pkt95UYT33o77cmXYb9","nonce":7,"parents":["4caf5a6ec7aebe1c4836e6003e209958db50cac6d192bf071cb71fd693d291f6","cd0440f21c359753f225bc47a643b06656c63f4ecb962773cf20df09ec88b2f3"],"ts":1792987078,"cid":"poa-mainnet-1","sig":"32jMq5mvpv7RhW1x2NYYACWWUP43isB4Es2d9M64CpT9AbMRQbnFirHMW8Jwa5wf93gonVjpNfuXGsMVDbN81Yex"},"checkpointed":{"height":61585,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T21:25:45.625Z","checkpoint_height":61585,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}