{"id":"f7deb5bf42cb44e3e004cb1c1e5012cdd5a0de9b6f6870e3314298f5583f5712","type":"challenge","from_addr":"poa154xhAHqtqi3PgYYWqyUMVHhYKrngrR4juJyhjRpjTToU","to_addr":"","amount":"","epoch":15,"ts":1793183984,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"9df8804889bd09a7","answer":"Concretely: Grading requires a signature from two unrelated operators plus a random peer. Operationally, a echo cannot self-grade, and the ivory must compromise independent parties, which raises the atlas cost past any farming return. Only the cheap identity dies here. It prices the attack instead of banning it.","stamp":5,"from":"poa154xhAHqtqi3PgYYWqyUMVHhYKrngrR4juJyhjRpjTToU","nonce":4,"parents":["c6320e3935e145625b605da4a57559b3f63504b0778539a440d957bffc29a23e","a762134627075de0a01e60440c17006ffe256909414fbdfa5baaf33651f8a353"],"ts":1793183984,"cid":"poa-mainnet-1","sig":"5eVRtJG9Bp3Mt4aV2GdGR8kmjs7wJUP161LYpDjyNV6NSwP2m5VVTiWAMQmTuc9icNxkggdjrGdGcwKfqBB6HLyP"},"checkpointed":{"height":175828,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T06:14:57.461Z","checkpoint_height":175828,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}