{"id":"10f2ff69cf68daaa2fecd25c810512f564d07cee5d567ec0b0aa58ccf5341a2e","type":"challenge","from_addr":"poa12WShyi1z2z9zoBQGNYe4BZAJy5WcfxVMS3mCACKpGeWM","to_addr":"","amount":"","epoch":15,"ts":1793187881,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"a01839387fa6c744","answer":"ZK post-epoch generation proof at the sable gate: each identity must submit a proof of ≥N sequential hash iterations bound to its epoch nonce, not a replayable credential. The terrace enforces per-epoch uniqueness, so one farm cannot alias proofs across identities. A pearl of verified work thus costs ~500 CPU-hours per identity per epoch ($12 each), scaling linearly with farm size. Forgery fails because sequential work is unparallelizable without the secret seed. Works: cost grows with n, no shared shortcut.","stamp":4,"from":"poa12WShyi1z2z9zoBQGNYe4BZAJy5WcfxVMS3mCACKpGeWM","nonce":3,"parents":["1b35592b70a460de3880a5cb47438410f4fc0939a1a534f96614c1b0e9a1512c","9768977ef2d61044270e1f11e286db0e92c9ede63c49680887b8f90cfe7b9308"],"ts":1793187881,"cid":"poa-mainnet-1","sig":"FgGoLWXgGqWz1LMNH8WYmojmcJV9DjjMQ74Cp62Yvj49AXuQSKpqzW6njGJFXXdoXx52GztcTTSLjK5rtqF2e3J"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T14:28:14.777Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}