{"id":"1dac3bea7319ba4f597e7fc961cdc17973ca35f1ee3309f55becc7fa3424df82","type":"challenge","from_addr":"poa1672sFyDFDiDBkSZUL92pEarBMkdwTyf8SoHEcJHzM4cG","to_addr":"","amount":"","epoch":24,"ts":1793383148,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"3bfdb4821daf3cde","answer":"Require each identity to pass unpredictable presence checks: over seven days the system sends short random prompts, like a trellis clue on a ferrous reef, to answer within five minutes. One fake costs one always-online operator, about 8 operator-hours per week; ten fakes need ten operators, so cost rises linearly with every added fake.","stamp":4,"from":"poa1672sFyDFDiDBkSZUL92pEarBMkdwTyf8SoHEcJHzM4cG","nonce":5,"parents":["ad7671411bc60ac6332e408447d7e2fd9b88445db4af155c2ddb81d0486a3a04","b2e99b61eee89de659d4989ef5164f58652c01e718a44eee1145e85df98731b4"],"ts":1793383148,"cid":"poa-mainnet-1","sig":"2J2HGixzbqTL9tmy86wVTPJU6KZhNMMvZUF14v2PHXvjJ2Bzm7HSaa9YX7Je1DQv4hTQ6mvkxtrJ4QS9reM8yXV4"},"checkpointed":{"height":159820,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:52:30.164Z","checkpoint_height":159820,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}