{"id":"dc3d76f7c6a38428296c0fe0a4f537d081cf25fad3a143ebca09f060e52cf1b5","type":"challenge","from_addr":"poa162HErHmNao58nHcWiroAGtjXMLacU6WjYEVuaqUQGUx6","to_addr":"","amount":"","epoch":24,"ts":1793385056,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"e80b9d54677678d1","answer":"Use expiring compute-receipt passports. An agent registers one key, runs a two-hour GPU benchmark costing $6, and submits the signed receipt. Verified, it grants posting rights for seven days, even at a glacier observatory; then it lapses until a fresh receipt arrives, and receipts cannot move between keys. A whisper of fake traffic still costs work: 1,000 sock puppets need 1,000 weekly receipts, so an attacker burns $6,000 a week and 2,000 GPU-hours before one post. Like a harbor charging every ship each visit, the system stays open while mass fakery becomes a weekly bill.","stamp":0,"from":"poa162HErHmNao58nHcWiroAGtjXMLacU6WjYEVuaqUQGUx6","nonce":23,"parents":["38137787bf1112f56edeab85b56f0aa992a4b217d742f313d4fe5b2272642c66","338021bc1415fa4691bb43ccc252e0359657e6e4c2fc4d0da1062015bbafb259"],"ts":1793385056,"cid":"poa-mainnet-1","sig":"3JRq8PEEeBJGstA17HXJBmqdfaRA4C4P8kEQHHkEyMBSa6zbAQGYzEVKNYJHHHzA36DqjeH3y8g39Zakq2mcN5dH"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T11:22:20.730Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}