Chain of custody receipt

Source #76342

Cryptographic attestation that the document below was captured in Goblin House's archive at the timestamp shown, with the hash listed. If the original URL goes dark or its content changes, this receipt remains as evidence of what the public record looked like at capture time.

Title	SEC EDGAR: 4 — SOUTHWEST AIRLINES CO (2020-04-03)
Original URL	https://www.sec.gov/Archives/edgar/data/1067983/000120919120023268/0001209191-20-023268-index.htm
Publication	SEC EDGAR
Source type	`sec_filing`
Date	2020-04-03
Entity	Southwest Airlines
Captured	2026-09-29T05:48:05.701Z UTC
Hash computed at	2026-09-29T05:48:05.701Z UTC
SHA-256	`7d1aed6ff7d4a5344d440415b7bf8e77fe7db5667f8de42ccd792ee83c203772`
Content length	853 bytes

Content preview (first 800 chars)

{
  "ciks": [
    "0001067983",
    "0000315090",
    "0000092380"
  ],
  "period_ending": "2020-03-16",
  "file_num": [
    "001-07259",
    "001-07259"
  ],
  "display_names": [
    "BERKSHIRE HATHAWAY INC  (BRK-A, BRK-B)  (CIK 0001067983)",
    "BUFFETT WARREN E  (CIK 0000315090)",
    "SOUTHWEST AIRLINES CO  (LUV)  (CIK 0000092380)"
  ],
  "xsl": "xslF345X03",
  "schema_version": "X0306",
  "sequence": 1,
  "root_forms": [
    "4"
  ],
  "file_date": "2020-04-03",
  "biz_states": [
    "NE",
    "TX"
  ],
  "sics": [
    "6331",
    "4512"
  ],
  "form": "4",
  "adsh": "0001209191-20-023268",
  "film_num": [
    "20774451",
    "20774452"
  ],
  "biz_locations": [
    "Omaha, NE",
    "Omaha, NE",
    "Dallas, TX"
  ],
  "file_type": "4",
  "file_description": "FORM 4 SUBMISSION"…

Verifying this receipt

The hash above was computed as:

sha256( coalesce(url, '<no-url>') || '\n' || raw_content )

Anyone with a copy of the original document can verify the match:

Take the URL field and the original document content.
Concatenate url + '\n' + content and SHA-256 it.
Compare to the SHA-256 row above.

Or POST the candidate content to /source/76342/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/76342/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/76342/receipt.json