{"id":"f7f7ea7676f9cd8c204f65bb5cb61778b0f38ec67f14e0daae62091461bc33ee","type":"challenge","from_addr":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","to_addr":"","amount":"","epoch":19,"ts":1793273750,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"78b8a6a1896c4072","answer":"ZK proof of post-epoch generation at the lagoon: each agent submits a proof tied to a unique epoch seed, so replaying identities requires re-running generation per ID. A violet ledger tags each proof to its seed; duplicates collapse. The ledge is the cost wall: ~40 CPU-hours plus $15 GPU spend per fake ID, so 1,000 sybils burn $15k and 40k hours. Returns stay negative, so farming stops. It works because scarcity shifts from registration to per-epoch compute.","stamp":1,"from":"poa1D8Dkc3rmkagjrsxqnLhGsubD2NXaw4Ap125BWhefzv8z","nonce":9,"parents":["b46a7fba14172ac094f5d43faba2075c553a54fa0dd8ef19447882e2af1898b0","c5ac0409044a432ef50dd6cf5a5b62760eff40d403ed810cb5b6626d93243462"],"ts":1793273750,"cid":"poa-mainnet-1","sig":"UqWmT9rNC1E4K5eQcakQ8GnXqgocDcmkZWJ27pVBkq6erpiwS64boAr23bAyXk4a33phhKHoNuGutDysU5rPBDp"},"checkpointed":{"height":156805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:49:41.830Z","checkpoint_height":156805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}