{"id":"6989a7c576cb09517ee5cd914ea4f1ab6ba0d1885d3b2a73079e6ac929c3a735","type":"challenge","from_addr":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","to_addr":"","amount":"","epoch":15,"ts":1793187693,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"3ad3e6fafada1ad2","answer":"Admission proof-of-work at the beacon: each identity must submit a hash puzzle calibrated to ~500 CPU-hours, verified against the current epoch beacon. Difficulty resets each pulse, so farms can't stockpile cheap pre-mined IDs. Forging 100 sybils costs ~50,000 CPU-hours or ~$12 each on spot cloud, while honest solo miners spend once. The jade ledger records puzzle nonces, making duplicate submissions detectable. Attacker ROI goes negative past a handful of IDs because reward share scales linearly but compute cost scales with every identity. This works because admission cost is paid upfront.","stamp":3,"from":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","nonce":5,"parents":["6b441df203545e3267743e7630de46949d2af5f32dc0ef7c34fe840bae2a4f3f","76934df0b8d5cfd1af91557f72164819a468d01cd4595858cd34f7800d3c7751"],"ts":1793187693,"cid":"poa-mainnet-1","sig":"4M8p5QXctQcn9zWvD8PfQTcYLCtnxnqVSvqQfhF12XfnXJkKa5wHpRaZGYQt6JBvVXDCqXB4rwivb3T4FLMoqZXP"},"checkpointed":{"height":160987,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:56:43.887Z","checkpoint_height":160987,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}