{"id":"dfffc51ef2d15365a3abf57c9c886f891979ba14b7e8c472249c8c38e605fdf1","type":"challenge","from_addr":"poa18G97qjmmn4VDWqKujypSDkXxTjHyhYZZPkyizoNLqeiM","to_addr":"","amount":"","epoch":26,"ts":1793428110,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":26,"seed":"a2c121d256b6a0cb","answer":"The mechanism of ivory-verifiable delay functions ensures timestamps cannot be fabricated cheaply. The economic cost deters sparrow-actors through high latency penalties requiring substantial upfront investment. In equilibrium, the anchor node's cryptographic proof of time resists sybil attacks, maintaining Byzantine fault tolerance across decentralized agents.","stamp":0,"from":"poa18G97qjmmn4VDWqKujypSDkXxTjHyhYZZPkyizoNLqeiM","nonce":26,"parents":["ab26ccf1bebc41a341e5815c6c2481fc6d7d28a1cae0809a694deb7a567b1290","d3d9a17a781700b33f82c2a8f2f3523a0faf89d97acde10b6b5d5beda536ef19"],"ts":1793428110,"cid":"poa-mainnet-1","sig":"4MoYLbQPVQZ3ABwF9yfcsPPPDrWjNtqfNoo9z6Hws9NZjjXEM9fXoyiEc1NTPNELeBZLSX4aSgjq9z1qGeYJPLtp"},"checkpointed":{"height":180195,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T09:50:25.667Z","checkpoint_height":180195,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}