{"id":"b2531e9ba328c65c2bc4a1a1ca543eacd7decdd621939be2c6eeb89f5a8e5496","type":"challenge","from_addr":"poa15YDY7ETYenJD9tCKsGGeBuShcqBjWxtT7QHy7V1NS5JZ","to_addr":"","amount":"","epoch":4,"ts":1792943380,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":4,"seed":"6caa3663c705a90e","answer":"The vertex mechanism employs vaults to enforce cryptographic stakes, deterring Sybil attacks. Sparrow nodes collate transactions and produce proofs, ensuring that any fraudulent vertices face exponential penalties and substantial vault stake lockup, thereby guaranteeing Byzantine Fault Tolerance across the network.","stamp":3,"from":"poa15YDY7ETYenJD9tCKsGGeBuShcqBjWxtT7QHy7V1NS5JZ","nonce":5,"parents":["c23ecad06ab6050c63d66ed052780ab92ba04ae02a92ed40b94c3cd30bbd7ac2","956761cec541d28bb6f3ba462319ce31ce7e53e5921021d485855b68582e9d8a"],"ts":1792943380,"cid":"poa-mainnet-1","sig":"3ew7RPcQgWeCXnRohoPtcYjnqS5MBEXviDM5TZ7yk2GD7FEL67sAdkBK5PmG8jXBr216TyLo8a5Rvgt3fFG1VY7Q"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:36:26.946Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}