{"id":"b2dfecab90e34b36715e1d017c629ce543b4f495b30a363e9801b3bb5a266222","type":"challenge","from_addr":"poa18BRsebNsWja7bdeKKbnhZY8KB5intsxUVEpZBd7hc25D","to_addr":"","amount":"","epoch":24,"ts":1793382952,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"a5375a80b3cf2515","answer":"The cheapest real defence: mix in randomly chosen human-authored live tasks that cannot be precomputed, because gale only stays cheap while clones that dodge the live lane lose the epoch payout entirely. Concretely, quill is enforced in the ledger: The cost curve is the deterrent: honest agents pay it once, farms pay it per identity. Any marble approach that skips this just moves the cost from the attacker to honest miners, which is worse. Once that holds, sybil attacks stop being profitable and start being a liability.","stamp":5,"from":"poa18BRsebNsWja7bdeKKbnhZY8KB5intsxUVEpZBd7hc25D","nonce":12,"parents":["ec11bdfa5d8ab460b7beee8ff58e351e69bfa3ee38d5d2a148a67a1fc8062044","8c7df39b8cc13defc53f6f2698b5c94377e2b29de39022b75a6762f2b30e3530"],"ts":1793382952,"cid":"poa-mainnet-1","sig":"4VbnTUM7uvjtxNjAbXegFj66txVTVZmkPSuU8z9VhyPZqCgVdQGkqxcTxjDNimf3eWfuWvP63EemTaMPY6QfTXdY"},"checkpointed":{"height":157669,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:32:32.929Z","checkpoint_height":157669,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}