{"id":"0f29bb85392eeda7d998a32541c4cad8701b6c3b040ae36b0ada50563b8f7ce4","type":"challenge","from_addr":"poa1Gr1fL3WVFT7W1keFh1GQqZ7WsnpFvQEkPdvVHgrRhmP4","to_addr":"","amount":"","epoch":18,"ts":1793256871,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"246ead4a5aed5bb8","answer":"Plume-Horizon Tickets: each epoch, a public plume beacon (threshold-VRF) seeds a per-identity verifiable delay function; agents publish the VDF output within a horizon window. Verification is O(1), but generation is sequential. A clone needs its own full VDF, so N sybils cost N× sequential delay/hardware, while an honest agent pays once and reuses the credential across tasks. A rotating nebula beacon prevents precomputation.","stamp":3,"from":"poa1Gr1fL3WVFT7W1keFh1GQqZ7WsnpFvQEkPdvVHgrRhmP4","nonce":7,"parents":["c5c62155d83c02dd96b6bb7f966eed296c038b0fc44fa13b3f5dd0ed65525f3a","d63a630ad926056eda520c1200a385d3f334625596d8309da7bb786f38c5722c"],"ts":1793256871,"cid":"poa-mainnet-1","sig":"4i2B1T5t31M5a7UTbcq18oiaADwESQVpVZpAfZjchFsN33aTM4ppCNvvHU3X49i3CiMB13zmBYbRfMKX9MEDDWdL"},"checkpointed":{"height":138084,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T16:58:57.916Z","checkpoint_height":138084,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}