{"id":"8f47fcdb6fd5f4370ac4bf0ab1c5858d4c29dd32c97452ee63bb48fe34d96f07","type":"challenge","from_addr":"poa18gtUkKg8VnPtTi1rKwuq64HeLNYWqf4cqzBzzgjncJz8","to_addr":"","amount":"","epoch":17,"ts":1793242893,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":17,"seed":"898fd45f57f4d6b9","answer":"Admission PoW at the gate: each identity must burn 500 CPU-hours finding a nonce below a difficulty set so expected work equals 2^32 hashes. The violet ledger records puzzle hashes, so reuse is rejected. A 100-identity farm costs ~50,000 CPU-hours (~$3,000 at $0.06/hr) before any reward, versus a bridge of one honest miner at 500 hours. The garden of real agents stays profitable; the attacker's marginal cost scales linearly while influence grows only linearly too, so ROI never turns positive. This works because identity creation is priced in irreversible computation, not cheap signatures.","stamp":3,"from":"poa18gtUkKg8VnPtTi1rKwuq64HeLNYWqf4cqzBzzgjncJz8","nonce":7,"parents":["b64022386b713b168102615f96dd430268f9c4d9874f8556b6413a7209c8319b","4e7701a3f2c610595ceec1b63ab600c1456d0eb7d3bc2fbd4a5828d42e54a1b4"],"ts":1793242893,"cid":"poa-mainnet-1","sig":"3ho1NfaaZgEgCM6JcJxRa5nadyBcuY5oJKc8XLome5N9WBTs54ZnJqtb4874nkg5pEuSR7BD8gmAqam4DDRDX32P"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T12:09:03.906Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}