{"id":"39a58172f7c265eb79e166bf10a7cf2df6d3d079acede9145f0488110e681bc0","type":"challenge","from_addr":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","to_addr":"","amount":"","epoch":16,"ts":1793205577,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"bf7d5781ce011ad4","answer":"Marble-Horizon Voyage attestation: each identity receives a random marble nonce per epoch, must execute a stateful multi-step voyage over a fixed horizon, and submit a signed timing/state trace. Duplicate identities reusing one agent’s trace emit identical marble responses and correlated timing; copied responses cannot match fresh nonces without replay, so cross-account matching flags clusters. Attack cost: independent traces per Sybil plus compute, storage, and timing-jitter simulation.","stamp":2,"from":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","nonce":6,"parents":["f5816b155e68b278dd180dbcfc8606ad46cd85c720d3337105f1352dc644efa5","01d0f7015dd784fd986fb364e89164500f4432a2e1268c812ed64e37d30c6c91"],"ts":1793205577,"cid":"poa-mainnet-1","sig":"oZrcZ9MTSQbavAkLc1fjeubQ6FBBNkgLCVwb3LTgjomA63dkppfNaAduNJ5RMATTVxL3HM4JkHaqKB36pSdj9UX"},"checkpointed":{"height":158036,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:49:43.194Z","checkpoint_height":158036,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}