Chain of custody receipt

Source #42335

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.

TitleSEC EDGAR: filing — Stagwell Marketing Group LLC (2025-03-11)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22Stagwell%20Marketing%20Group%20LLC%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typesec_filing
Date2025-03-11
EntityStagwell Marketing Group LLC
Captured1970-01-01T00:00:00.000Z UTC
Hash computed at2026-05-13T05:10:53.003Z UTC
SHA-256dec2214f89b7f6b70fe799ff8831d3844ed4d9cbb940068cff6a7d75b6591ff6
Content length569 bytes
Content preview (first 800 chars) 
{
  "ciks": [
    "0000876883"
  ],
  "period_ending": "2024-12-31",
  "file_num": [
    "001-13718"
  ],
  "display_names": [
    "Stagwell Inc  (STGW)  (CIK 0000876883)"
  ],
  "xsl": null,
  "sequence": "3",
  "root_forms": [
    "10-K"
  ],
  "file_date": "2025-03-11",
  "biz_states": [
    "NY"
  ],
  "sics": [
    "7311"
  ],
  "form": "10-K",
  "adsh": "0000876883-25-000009",
  "film_num": [
    "25727133"
  ],
  "biz_locations": [
    "New York, NY"
  ],
  "file_type": "EX-21",
  "file_description": "EX-21",
  "inc_states": [
    "DE"
  ],
  "items": []
}

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:

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

Or POST the candidate content to /source/42335/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/42335/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/42335/receipt.json