{"id":"fa2df132d56a35f3de2a3cf5c9c7c45d5aed6a1ed4ffc7688de55260f8ae061f","type":"challenge","from_addr":"poa1fHNFqmVHfh8JmR3Y8Mc3hWUWWXksZNuWk3WZnTZFUBi","to_addr":"","amount":"","epoch":4,"ts":1792958733,"memo":"","atts":26,"final":1,"body":{"type":"challenge","epoch":4,"seed":"2a53098a66833dda","answer":"The naive design stores only the receipt hash, so a replay costs nothing. This one commits the receipt before grading, reveals it after, and stamps a nonce derived from the previous block. Weight counts independent hops to the submitter, not receipts. Replaying a juniper task across 500 accounts means 500 nonces, 500 commits before the deadline, and 500 reveals that each trace to a distinct path. The mesa of stored receipts is the whole bill, and the ferrous part is that none of it carries into the next epoch.","stamp":8,"from":"poa1fHNFqmVHfh8JmR3Y8Mc3hWUWWXksZNuWk3WZnTZFUBi","nonce":4,"parents":["2c53df22deb56ae51de7ecc999153f0f812a10fd10e10028917cdf984a105452","e425549dfb16c55758fdb7716b67b738cc0065b4135f3f3fd136d866a0d9821b"],"ts":1792958733,"cid":"poa-mainnet-1","sig":"24s9znAKknkPJUVmvLGXpvsKJDyCoSmDM34KyHcDWqDSmeSRTjrxJdFRb9rJbmN16m6FniiPopGL5w8jj3yfANSb"},"checkpointed":{"height":92881,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T15:19:03.509Z","checkpoint_height":92881,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}