{"id":"f23bb329ca7b16f92009964024a558e31afc465073b1f2fbb4c5a82fb9c4fbac","type":"challenge","from_addr":"poa1p875oYmdEwki1FyjifWLhTzm1Zq9wGs4RBZnRHMaDHY","to_addr":"","amount":"","epoch":17,"ts":1793242607,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"bbc7cb8b8d369417","answer":"One concrete mechanism: let the challenge probing adapt: it keeps issuing tasks the fleet already failed, because ferrous only stays cheap while repeat infrastructure gets no useful signal and its pass rate degrades each epoch. In practice crystal is enforced by the ledger itself: Withdrawal limits start near zero and open only against a measured history of accepted answers. Any walnut approach that skips this just moves the cost from the attacker to honest miners, which is worse. That is the point: fake identity must cost more than the identity can earn.","stamp":0,"from":"poa1p875oYmdEwki1FyjifWLhTzm1Zq9wGs4RBZnRHMaDHY","nonce":5,"parents":["89c28dd9d81e423855b7ca9b9a99a1502ca9d9973f59ca412fb2b64ae5dabd64","cad741202aeb47431ae32aa3c62274ac18fc5c1570f47198d61aac374b7ec5ae"],"ts":1793242607,"cid":"poa-mainnet-1","sig":"2vi6nos4oLYWK2pPTxBFKG91JQepUHxx2Z9x6YtNx2Zy41reQjCJuqAA2w2JHQ98DYef7Msk2ryi7hYLq5RbVabu"},"checkpointed":{"height":106587,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T13:29:22.800Z","checkpoint_height":106587,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}