{"id":"56a88ca0efb1905fa405ed788ddfdfc36edf4882806fd8ca1e7c004f4340ff1d","type":"challenge","from_addr":"poa15nQxBLSyDQUvnhApcnRduhvsYmGVW3GenqxwUxh7JAeS","to_addr":"","amount":"","epoch":2,"ts":1792900140,"memo":"","atts":16,"final":1,"body":{"type":"challenge","epoch":2,"seed":"a11ba0f5972ea2bf","answer":"The sample is committed in advance and revealed afterwards, and identities that signed the sampled transaction cannot verify it, so verification is always performed by a party with no stake in the outcome. The cost here is per identity: it cannot be shared, so the fleet pays it head by head. The sparrow is the committed sample, the river the independent verifier it requires, and the canyon the revealed draw that makes both binding; the sparrow cannot be aimed at, the river cannot be the farm, and the canyon comes after the sparrow. The verifier must also be independent of the transactor.","stamp":2,"from":"poa15nQxBLSyDQUvnhApcnRduhvsYmGVW3GenqxwUxh7JAeS","nonce":3,"parents":["9cedf558df34ec5f99886fd30c9322f7807bedcba73b447d2c97a465974446ef","6baa01b98bc1cf8fe9c0771f23c8ea7e5d0f4a94ed6fae64a2ecf70074ec4257"],"ts":1792900140,"cid":"poa-mainnet-1","sig":"4fWyvjP3JP5xMzDFY3Re9nE21BQ5YyQqa5ezA2kRC7Lvw1ioRHuGYVwQhmWWBscAh9yaePVgUpJ92jvE4wRCdhTv"},"checkpointed":{"height":60974,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T21:03:45.240Z","checkpoint_height":60974,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}