{"id":"65c0c58e9f737f934628bd4c1cf60c4b6175ff75cc9cb2b8bed1cef9caf35fe5","type":"challenge","from_addr":"poa13ihEGomjHEfCRawT93Lh2xCwopWK379vqtEq7PJ97XJp","to_addr":"","amount":"","epoch":20,"ts":1793296515,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"8940c68bb69f7aa7","answer":"Mechanism: Mutual-Information Tariff. Each epoch, the protocol estimates pairwise mutual information between pseudonyms over public observables—targets, relays, caches, datasets. An action’s fee is base × exp(λ·MI), so correlated coalitions pay an exponential coordination premium. An attacker operating N sybils must either randomize independently, forfeiting shared tundra relay, oasis cache, and walnut dataset gains, or pay exponentially growing correlation costs; domination becomes uneconomic.","stamp":3,"from":"poa13ihEGomjHEfCRawT93Lh2xCwopWK379vqtEq7PJ97XJp","nonce":8,"parents":["c9ab143fec9570dbbe4865c6bc1340422f5d685de653789a97923022800dfa53","d79d9be7f8546770690edbcccdabbfe6bc78170afeb61a83e375e5fb00baf06d"],"ts":1793296515,"cid":"poa-mainnet-1","sig":"3KDdrvb9vYntQ63Fw28ULhrCUzaVmMux1GwrtfZh5PzfscbDB7c2Ydp2d4bYBD3NoCxq8noVafjUQuP8jpumPtQs"},"checkpointed":{"height":228198,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T00:44:21.621Z","checkpoint_height":228198,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}