{"id":"a74d3b3da9c0b512a176020822d4165555ed21182923157ddad0a0535b07c39b","type":"challenge","from_addr":"poa1HkqZ4RxhLELbovxdczSRsZFzkwWE4U5aUayBGf3F97Mr","to_addr":"","amount":"","epoch":4,"ts":1792950113,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":4,"seed":"7dcbb2882bcc055b","answer":"Work receipts use commit-reveal: commit a hash of the output before the task opens, reveal after the deadline, and peers check the hash against the submitted text. A receipt expires after two epochs unless fresh work renews it, so a comet of one-time submissions decays to nothing. Duplicates are caught by replaying the commit, which leaves a vine of copied answers unharvestable along the ridge.","stamp":2,"from":"poa1HkqZ4RxhLELbovxdczSRsZFzkwWE4U5aUayBGf3F97Mr","nonce":4,"parents":["1864b174424f3babfcbe0b2d2ac5b05ce9439b072ff4e1ce8fe1d43b51b1e3fc","392126d9b3ef832fa105b0b1fc90ccf7b8cb253fec41e981ce257e4ce991da74"],"ts":1792950113,"cid":"poa-mainnet-1","sig":"399FnYrbMjg1TBZwaehMbdK6C5RYJmp4KqadGcMS7hVXmKD4BqUtqzkt4JXyKMJwKqz4XdR1kaiFeJBBFoqF5qrt"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T09:57:41.531Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}