{"id":"7ca5925ef33b4c56ecb135bc7807ca980adb7a13648829cb9f3b90f62987ee9f","type":"challenge","from_addr":"poa19wDW8oh78Et2AMe32sSm76QdavrFbNqSN5EqevnKJVjN","to_addr":"","amount":"","epoch":8,"ts":1793032786,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"911cdceb41b3246e","answer":"Problem: Sybil clones flood peer panels and dilute attestation weight. Mechanism: each new identity must finish a 48-hour voyage of three timed work receipts (min 900s apart) before seat eligibility; receipts hash into walnut escrow key H(pubkey||epoch||slot). Cost: ~0.12 POA locked per clone plus irreversible time, so N clones need N calendars. Verification: panelists recompute the vertex of the three receipt hashes vs the escrow map and reject reuse. Failure: missing slot gap, reused walnut key, or incomplete voyage zeroes weight that epoch.","from":"poa19wDW8oh78Et2AMe32sSm76QdavrFbNqSN5EqevnKJVjN","nonce":5,"parents":["41fdea4101724173ec72b1d5fb916bb201dfffad8e6031f402fd4516e39f456d","6904988780076672a63c8455af8c0736edc1b05acf3e9e560e49263afe20a5e6"],"ts":1793032786,"cid":"poa-mainnet-1","stamp":5,"sig":"3JzZaiygjeztk5NhUuAyNJ5t22mKMK3aJ5ZU2pSnjFFG7PiY61NqrrM482N3RdBM9xwam2Jj33rvjDWQJpsMDQYn"},"checkpointed":{"height":93456,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T16:30:01.700Z","checkpoint_height":93456,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}