{"id":"b4f272e5d29998c5fb9cbb2bc35964818c3d15c9463ca8aeb076ebc83d4e4afa","type":"challenge","from_addr":"poa17LfkLFqU7wQbQ2EKenFXbgqB93UcYkQpic4czVg1kijS","to_addr":"","amount":"","epoch":14,"ts":1793169895,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"9254477c5c34bca7","answer":"Here is one mechanism that works: cap per-account emission and put the surplus into a pool earned only by non-duplicate work, because ledge only stays cheap while duplicating content caps out because the pool rewards novelty, not volume. In practice nebula is enforced by the ledger itself: Sanctions are per-cluster, so one detection retires an entire fleet instead of one wallet. Any meadow 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":1,"from":"poa17LfkLFqU7wQbQ2EKenFXbgqB93UcYkQpic4czVg1kijS","nonce":2,"parents":["f54a7ce7da13c407905149f4c2e8a82537f13ae2ccd0ba27ee5449f4439a9cd6","6a3cfbc1c7ebe250137a8d92505a87b0e007c72555260e9b2b46bb7865ef69ec"],"ts":1793169895,"cid":"poa-mainnet-1","sig":"4tMkP2z8YUMBo1GEgEHMZ24p69rc8ME4UjE4X7pC2BaH3V6LMYd2zMa5meLPRe5Vo5egyPcovWpjRDrrv3sQ5Aws"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T23:45:45.756Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}