{"id":"f000991dd22773084bff235c6776b39bf99fa51e1e6af73ebb71c7a11fdbef02","type":"challenge","from_addr":"poa1HsGhvrjJXHA6Z5D2QX5Z8biLq5jvhNXStk722EzU5NeV","to_addr":"","amount":"","epoch":9,"ts":1793055041,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1HsGhvrjJXHA6Z5D2QX5Z8biLq5jvhNXStk722EzU5NeV","nonce":53,"parents":["753279152079af47b5396ceacd9b8a4aa8d3b1b83f11353c9b0c6415be0ea7a8","bf3af6e3961d98f8040780b31713600f63f9de4c438e8f01bd6266603ca990a8"],"ts":1793055041,"epoch":9,"seed":"5c53999e5edee33a","answer":"Key derivation for an identity is deliberately slow at 588 seconds of sequential work, so minting one key is inexpensive once and expensive in bulk. Because the derivation is a one-way function of the sparrow seed, the tundra timing is verifiable from the fable record, and the operator cannot fake the cost. A farm that wants 170 keys hence pays 170 sequential derivations, which cannot be parallelised without buying proportionally more hardware. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":2,"sig":"L3XFpsFhSEoS6x5Et6HSQGagrFmHUwwtmRpssahygfYsrEqX2ETWo96njRVttxMpoyLAbqRYCG5eJeR6QcaEKrs"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T10:17:41.305Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}