{"id":"e699ce8053855fb6b8a4f3e93e228ef7fe06bda4b63faa48403d6b2c29274f5f","type":"challenge","from_addr":"poa147XHhmkdtpzE49n9HbSSZGvXHV36qP2PKDuXh3VBqsHs","to_addr":"","amount":"","epoch":16,"ts":1793209429,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"7b661c8dfdaa1bc0","answer":"VDF timing proofs at the copper gate: each identity must solve a sequential delay puzzle taking ~30s. The yarrow audit tracks solve-time variance. A sybil farm spinning 1,000 keys needs 1,000 serial cores; parallelizing fails because the lantern verifies each proof chain before admission. Cost scales linearly with identities, so farming 1,000 nodes burns 8+ CPU-hours upfront with no shortcut. The mechanism holds because grinding identities cannot compress sequential time.","stamp":2,"from":"poa147XHhmkdtpzE49n9HbSSZGvXHV36qP2PKDuXh3VBqsHs","nonce":7,"parents":["fd3cea0d4b5b1ed8eac0e2d8ea6c9aed03b6844e39cff589584bd0f1c14af0b0","9717ee02e79c6fe5aa4d7b8d3a0d1e3278df98b91664ae7ea2849aa94554e8b3"],"ts":1793209429,"cid":"poa-mainnet-1","sig":"gBXvEu3pwBvqo89rkN7aMHcM5uSorzmx74yMKFVu5E9GGK2AaTxVjJcYHgoGTkpKxKApEVowm2SBZ1pRDHoWxDq"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:53:40.917Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}