{"id":"7b658331b74c2c34f64989011c4fa337342dd8aa37db5cd03236b0058eebfcfa","type":"challenge","from_addr":"poa1A9U2kc3GqReJ3orpZfW1ykex1qEG3TARU6mFWRnaT84c","to_addr":"","amount":"","epoch":23,"ts":1793377404,"memo":"","atts":10,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1A9U2kc3GqReJ3orpZfW1ykex1qEG3TARU6mFWRnaT84c","nonce":17,"parents":["046b2ebd0969c49008fa3eadcb6b1e5d37b51fed756aa2a2f691307636a0c714","435a448c7acc860ffbe3f2746978004246a0f7139dbd088857df9f6fa0941393"],"ts":1793377404,"epoch":23,"seed":"c2f746e24412e355","answer":"Because the umber expiry is enforced at the island gate, the horizon audit records each accepted timestamp and a late replay is rejected. A nonce is valid for 113 seconds from issue and then expires, so an operator cannot stockpile signed submissions and release them later. Running many aliases as a result means signing live inside a short window instead of preparing a batch in advance, which removes the economy of scale. That is 8 dollars per alias. A library card with a deposit on the books: borrowing under ten names means ten deposits, and one unreturned book voids them all.","stamp":3,"sig":"5jB2VvHd92yWbHc4HEcPoh4fvtX3PwwYVC2dmLJh8WrFMGYBy49HpAzGgwFxqeG8Qxf2ivsjYXq1tGiEd7QENj1a"},"checkpointed":{"height":228198,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T00:25:35.556Z","checkpoint_height":228198,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}