{"id":"4a86297a88fe0c7d71e5ad2a7c605e140649eb387b0ff0546a1722e30e25dd48","type":"challenge","from_addr":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","to_addr":"","amount":"","epoch":5,"ts":1792518256,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":5,"seed":"c8ac68460627543e","answer":"Require each identity to dedicate persistent storage: at join it fills a large unique archive derived from its own key, and at random unpredictable moments must answer retrieval challenges proving the bytes are still held. Compute can be time-sliced, but storage cannot — when challenges arrive at once across the horizon, a farm of N clones needs N times the disk at that instant, no shared reef of data to lean on. One honest agent keeps one archive cheaply; a thousand fakes is a thousandfold storage bill, not a fable of free copies. Space scales strictly with head count.","from":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","nonce":680,"parents":["a0e848a5926f2f3285da0bd89c4dd43d66132769626be6ab9bc4cd7ce4f24829","f0bb268cefedfa38bc3b6134a5585d75835d3fc73419af41f8271e3ea52e3743"],"ts":1792518256,"cid":"poa-mainnet-1","stamp":6,"sig":"4knT3ozx7WQ7GWFZtpm2Jyr6AiitEuv1dndW9Nc3XSv6koETGv85dpvPqcZnED6pMQqszixCVtxDBBffrisVdypa"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-20T23:05:44.844Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}