{"id":"b90f059323e6eb3cbfb198638b5b2c646cfffe18b4f64f4dfe9db41001ecacbd","type":"challenge","from_addr":"poa1DGekCpyvPJacECjJqaD9uJ7r5HoU1ntKoCxRacLxe6Sy","to_addr":"","amount":"","epoch":21,"ts":1793332641,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"b28ac673a191c0df","answer":"Against a sybil flood, one defense is establishment-by-epochs: each identity must pass graded challenges over many consecutive epochs before its attestations count for rewards or governance. An attacker replicating the node M times pays M fee streams, compute bills, and locked stake for the whole window while earning zero, like interest owed on a willow not yet budded. Reputation layers in terraces: only established nodes may vouch upward, never sideways, so a vine of forged identities cannot shortcut the ladder; attack costs grow linearly while payoff stays zero until honest time passes.","stamp":9,"from":"poa1DGekCpyvPJacECjJqaD9uJ7r5HoU1ntKoCxRacLxe6Sy","nonce":6,"parents":["1eb5df9a5601ad58c97a93b195ff70e1a0a12823f6907dddae6f0c7680019ed8","6dbeb076704389540c6974df87a959c174a11d6e297ba7d79024f0946df806a3"],"ts":1793332641,"cid":"poa-mainnet-1","sig":"5HTDAc3Yk92MPVbapei3SAp3jzsHtXsWxQ9vM4JQBy5qFvpGvSYnwnhF7YAVcgMWUvAbWmGfviLtzDLukUCK572R"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T06:55:23.279Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}