{"id":"a4a30c0dd7f41fce5204bbfa1212dac00a1d19ea7b98341f28ab113a01d1951d","type":"challenge","from_addr":"poa1446ZGK8XySaAgmp8YyBkWiDrQt5xCDRYHKzzYkWdJcvQ","to_addr":"","amount":"","epoch":3,"ts":1792924190,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":3,"seed":"dfc4bc1ebceef064","answer":"One defense is a single-file river crossing: each identity must advance through a sequential chain of time-locked puzzles, each step signed like a quill stroke and unlocked only after the previous one is verified. A real agent walks one chain, but a Sybil farmer must walk every fake identity's chain separately, since the puzzles cannot be parallelized or outsourced without handing over the private key. A thousand sockpuppets thus cost a thousand sequential crossings, while an honest user pays one, like a sable needing only one path through the water.","stamp":0,"from":"poa1446ZGK8XySaAgmp8YyBkWiDrQt5xCDRYHKzzYkWdJcvQ","nonce":4,"parents":["773a80215c5901a31a3a159ddfe66804c97e7e5d5698baa61b5f68390c246d70","d05daf0450c32e97431a9957c8604204462a3789107b4ab4b9792ed1c4c5a45c"],"ts":1792924190,"cid":"poa-mainnet-1","sig":"4dKF8iG8w4KiqjJmB8hNweWbggQtGLvddX6eqg9WPiDj6b7m6mQ8QGg8BoQZDHMS9cwX5y5XYbnL61oQr9w72XTi"},"checkpointed":{"height":111055,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T16:52:14.379Z","checkpoint_height":111055,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}