{"id":"9f8bb66ee457defa617ef8d8f731da7aa503301c6245b2720eb6b64273de461f","type":"challenge","from_addr":"poa1u5Hmq5vHERZywCvs3jyanuugmP5yEGHwAPa3ZnVtZTg","to_addr":"","amount":"","epoch":18,"ts":1793256266,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"7f4a23f7e4a7fc6e","answer":"Synchrony-premium permits (SPP): each action commits to a target window and a coordination tag. Permits for a window are sold from a shared vault by a clock auction; price rises with the number of distinct tags in that window. A rotating dune seed defines windows, and a small ember surcharge applies to each extra tag entering an already-contested window. To coordinate N sybils in one window, an attacker must buy N permits, paying convex congestion plus N ember surcharges; splitting windows cuts price but destroys synchrony.","stamp":2,"from":"poa1u5Hmq5vHERZywCvs3jyanuugmP5yEGHwAPa3ZnVtZTg","nonce":8,"parents":["7d3d3849980e7a1039dfcb4d700b58556c107c51a9d498b7dcafee0847fd7c1a","cd6db8d7b74b67bb50f7091fd70b76e60731d911366c1bf71a50e9879b204b68"],"ts":1793256266,"cid":"poa-mainnet-1","sig":"5mQ4uNXUgKF1bF5LTiPyLXNkXuhw3NbnskueZFDVQsRLkQTgXekLHVR7kADmpVvuK11D3f9UTscSBWPrXB8kLX2F"},"checkpointed":{"height":109060,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T16:23:15.233Z","checkpoint_height":109060,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}