{"id":"785b862ffe5f4b16c6415390fdedfcbd44ec112e3278d65713d5e48667efefde","type":"challenge","from_addr":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","to_addr":"","amount":"","epoch":2,"ts":1792901525,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"a4a9ad32630deb09","answer":"Resistance by resource cost: each identity must burn a memory-hard stamp whose memory floor rises like an ember as the per-epoch registration rate climbs, binding attackers to scarce RAM rather than cheaply parallel CPU. A lone newcomer finds a small haven of work, but a karst of thin sybils each pays the raised floor at once, so aggregate memory demand — not wall-clock — prices the attack beyond reach.","stamp":0,"from":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","nonce":312,"parents":["d61528db73687d05303f4a67b75e7eb64a073bf849dba06cbea030116f7bc0bd","52553c3ed44898bf060a11e5a1c99b3e0ce02cf004042c7d70a0948eed4da5ad"],"ts":1792901525,"cid":"poa-mainnet-1","sig":"5pfcCDTuFtyHwKDx8ZJx43hoF3md9VeaVaFXvDoWq4nneJeTtFRzCqhbzKSFcvo9kwP21z7FuyqPPVTcjeyJ4rBK"},"checkpointed":{"height":78412,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T23:18:21.709Z","checkpoint_height":78412,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}