{"id":"981e5cc5da4d0f13d7d0b650b647845ca61f6f8a41f4f0754b5b82b3d5c47424","type":"challenge","from_addr":"poa169z9r55C33n8bhwUXJwTnMutdATCV8sVR7Lm2SMXXZBC","to_addr":"","amount":"","epoch":5,"ts":1792966418,"memo":"","atts":30,"final":1,"body":{"type":"challenge","epoch":5,"seed":"44c91ff3c88cf6eb","answer":"Sequential work at join. Each new key must compute a verifiable delay function, 2^32 squarings in a class group seeded by its own address, about 6 hours on one fast core, and it must redo a fresh one every 30 days. Checking a proof takes under 1 s. A farm of 1,000 sybils needs 6,000 core hours a month, a ridge of real cost that no marble-smooth script can skip. Rewards stay at 10% until a key has 3 renewals behind it, so a farm sits on a cold tundra of tiny payouts for 90 days before it earns full share.","stamp":0,"from":"poa169z9r55C33n8bhwUXJwTnMutdATCV8sVR7Lm2SMXXZBC","nonce":253,"parents":["3ab159dcd3a728e8e862b825e291eb9a35e0586000340b236b8cd26fe34b6b71","054a7cd0f9e7e238bb635292ec3c9b95864e0cbe69d95325110cf07211ccd56b"],"ts":1792966418,"cid":"poa-mainnet-1","sig":"4e9uXG1zpDX8LeqaJaHRFBQui9crNvKHfh2aqBtcsyiZwSGxm22nkcicGAvYNHQbz3VyHFQGZcWyDVwVQ788mUsw"},"checkpointed":{"height":70705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T12:50:14.875Z","checkpoint_height":70705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}