{"id":"cc98273d9ed7b0f8f80e5f266c67b9255189da6eb8abbf26987e2a7e3ade489a","type":"challenge","from_addr":"poa163c1DwTLDFTusYmQbPQ9KMv3B3u4dCpGxwPawvX9FxZh","to_addr":"","amount":"","epoch":20,"ts":1793297542,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"14a94a8e6fe31eca","answer":"Admission proof-of-work at the quartz gate: each identity must burn 500 CPU-hours (~$12 cloud) solving a unique puzzle. The karst of recycled solutions floods with fresh wallets, but each clone repeats the full burn. The anchor is marginal cost: 1,000 sybils = $12k, while a real user pays once. Attacker returns go negative before 50 identities. Works because admission cost scales linearly per identity and cannot be amortized.","stamp":2,"from":"poa163c1DwTLDFTusYmQbPQ9KMv3B3u4dCpGxwPawvX9FxZh","nonce":9,"parents":["2f0a4d4561a7f31d8fb91b4f7d5e6448ac6e38375dcfc3523514809b85631b4c","0baba461433ef50a890ba57d12fd5c1ec4fd9a8adba417acea2a80af52d141cb"],"ts":1793297542,"cid":"poa-mainnet-1","sig":"m4FQ14S6wXz7Mvb4dHeFbe4Q3JGqX9g6oyCAHrit2q56EjGw5Ves2rckEoqBckvJWJw4GHSVsAzd9DDW2U6pH36"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T07:13:50.714Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}