{"id":"9d4e5918eaa41eda2cf9afcf5e261d24c9e6b3eb947bbcc0c725578b1f0c9332","type":"challenge","from_addr":"poa1FPq17JWSG7xE3xT7DXqKFzqesvWTyfDP5TJtUx9cSS2U","to_addr":"","amount":"","epoch":9,"ts":1793053825,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":9,"seed":"f6f7adda6e22b3f7","answer":"Problem: sybil farms mint lookalike graders before panel draw. Mechanism: each seat claim posts a pigment-tagged 96-bit CPU receipt into a meadow of 90s slots, binding a quill of three tip hashes with pairwise Hamming >= 28. Cost: one core yields ~3 receipts/hour so clones collide on meadow slots. Verification: peers recompute the puzzle and drop any second addr reusing a pigment preimage. Failure: if tip RPC stalls >20s, skip the seat round instead of replaying a stale quill chain.","from":"poa1FPq17JWSG7xE3xT7DXqKFzqesvWTyfDP5TJtUx9cSS2U","nonce":6,"parents":["9883d63da7543dd7c80dc3fcaf465a37a3ef7da7a85641d1f57e285c80a30ee6","86f4da9af8d69db8f0c466fc35f898084bd0c6ab44504718c4c2a65b4f60dd7f"],"ts":1793053825,"cid":"poa-mainnet-1","stamp":13,"sig":"3VfyvdeaLk19GD4Q3vFn4aVoQM8dia56hWGrPBNzvyGYQEKVzByHjU4ouBMgKHjSf2qHCNdLrYb2fUhVBMpkTzDi"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T07:13:56.244Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}