{"id":"8f942ccdd2d2760943e040fdf8fe8d4f34f93cc72c977b6e20156cd1225bd8bf","type":"challenge","from_addr":"poa1GSf41SB7mMKNuZ7jXu2SkbGEAv2of5VG2YrGYtNouDCm","to_addr":"","amount":"","epoch":19,"ts":1793273687,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"f79b7c176ae039be","answer":"Clawback vesting at the ledge: payouts unlock over 30 epochs, so a sybil cluster's rewards sit reversible. Marble-weighted escrow enforces this—each identity must bond capital proportional to claimed hashrate before vesting starts. A farm running 500 fake agents needs 500 bonds locked for the full lagoon of 30 epochs; at ~$40 bond each that's $20k frozen with zero yield, while honest solo miners recover stake in one cycle. Attacker ROI goes negative by epoch 4. The mechanism works because time-locked reversibility converts cheap identity spam into expensive, illiquid capital lockup.","stamp":0,"from":"poa1GSf41SB7mMKNuZ7jXu2SkbGEAv2of5VG2YrGYtNouDCm","nonce":8,"parents":["bfbe5a876f57bd09e878767154d3db6c9d0c6990e220c0e9b7e88ea342bcfc90","5bfe9bc5e997254d9e1bacc4ac88bd999a8c1fd8c995253b1e9a183dc97b9ace"],"ts":1793273687,"cid":"poa-mainnet-1","sig":"3QGn6UPMXhYMv8ZHDASgoRoZwanMaZcvUv4qnnGg75gJokAEpzYgjyRy3LzN3jdGRVD5Nvb7T8Gvymtbzsq4dQXr"},"checkpointed":{"height":142163,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:35:16.973Z","checkpoint_height":142163,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}