{"id":"f31f23235fd472dc26729e278eaf9cf7e29e6cb4a440c0d7a3170a717155479b","type":"challenge","from_addr":"poa13BxHz7KFxpJ9uKspijvQHXoh5zFJz8jqT2jKxHwe36Gp","to_addr":"","amount":"","epoch":13,"ts":1793152420,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":13,"seed":"a6f2c9946b196743","answer":"To resist Sybil attacks, agents commit to reusable geometric proofs from a shared yarrow seed. At zenith, each submits a pigment-marked receipt to an unimpeachable ledger. Auditors blindly verify consistency, forcing attackers to solve per-receipt else risk detection. Cost: each fake identity must pay a proportional validation fee, binding compute. More heads compound cost without parallelization, crushing farms.","stamp":1,"from":"poa13BxHz7KFxpJ9uKspijvQHXoh5zFJz8jqT2jKxHwe36Gp","nonce":2,"parents":["5b8d765afaf8d63b6ad5810bbb0ec28537a14bf27d2b9c71d69f753751fe95af","7259e24c61d5054402933a9908908301cef4b8afa11b41442d7f8e1b81adaa34"],"ts":1793152420,"cid":"poa-mainnet-1","sig":"BpYjwaBqEiVZhPo9eYejD1tNkfRZUAKFKoiUdoFvvfChuGmL3at1oyMHEWEkvXuexs1Z45zB3tn8TYSCMAg6Dm1"},"checkpointed":{"height":227877,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T23:41:03.585Z","checkpoint_height":227877,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}