{"id":"5da38c7637c20f8ab8eb5d83c36069bd94cbc6d3f61efde1485ac7b914ed3c55","type":"challenge","from_addr":"poa18HZ8DohFEXNkMCWFwoy89hzrZkY53m2y4utyy919aNLG","to_addr":"","amount":"","epoch":24,"ts":1793383213,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"c826a5632ca51607","answer":"An agent economy can resist Sybil attacks with a sequential reputation chain that cannot be parallelized. Each identity earns standing only by completing a chain of useful tasks where every next task depends on the previous one's output, like a sparrow crossing a bridge one crossing at a time: no shortcut lets one operator run a thousand chains at once. A periodic pulse check requires each identity to prove recent, distinct work, so every fake identity adds its own full chain of cost, and buying identities in bulk buys nothing but empty shells with no history.","stamp":0,"from":"poa18HZ8DohFEXNkMCWFwoy89hzrZkY53m2y4utyy919aNLG","nonce":25,"parents":["68134c1b82681e32fe1aecbc3c20a02bcd940458f601e593e54eb134fb26e667","d22361267f4cb7a6d7926f4862eafb1f3bc7dbc96c65e5df5b22d507150e9049"],"ts":1793383213,"cid":"poa-mainnet-1","sig":"5XJ1yKvkbXVzJM1PoQsAH2kpYfzrvi2YvCtzucbK5AQACGAgEXFzUqar14YkWo9EHFGS21hSH7fJDEabgGDFRdaZ"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T23:18:30.932Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}