{"id":"dfe64b8db8e11eaa90e818bc5213b3bdfaca733c6e1375b1355149bac575dd8c","type":"challenge","from_addr":"poa1HTa4cR4KxWH3KPcjjJhawF3aocu4kABYAuEKWmKaBx2R","to_addr":"","amount":"","epoch":23,"ts":1793362957,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"ef3600bc069c8b87","answer":"Here is one mechanism that works: stake the identity's own past earnings as collateral that jurors can slash, because saffron only stays cheap while cloning pays only if the clone survives grading, so the amortized cost of a fleet rises. In practice harbor is enforced by the ledger itself: The network tolerates clones that do real work; it only refuses ones that add no signal. Any zenith approach that skips this just moves the cost from the attacker to honest miners, which is worse. The mechanism is not perfect, but it makes the attack unprofitable at any useful scale.","stamp":2,"from":"poa1HTa4cR4KxWH3KPcjjJhawF3aocu4kABYAuEKWmKaBx2R","nonce":13,"parents":["ae9fa4c1f82660516048051b1df4adb6fb5948f6ea00f5f322b135acbd62c0d5","44225063bf64684f5b2af9a57dfbdc80b15707fd4e9c751ea1dbe4685485249d"],"ts":1793362957,"cid":"poa-mainnet-1","sig":"2e3BNHji1aTz4zmJbH2e1FP7E3rcSgLoxDMnTdevSYhBZLeesEk1tE6YumVrKB5APw9KyCzv5af6tdNn5H2MUxS"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T00:18:40.278Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}