Chain of custody receipt

Source #63854

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 — SKDK (2026-03-13)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22SKDK%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typesec_filing
Date2026-03-13
EntitySKDK (SKDKnickerbocker)
Captured1970-01-01T00:00:00.000Z UTC
Hash computed at2026-05-27T01:45:05.513Z UTC
SHA-256b51b50f6e8d36a438563889b1c3e44d3cf0403531937a5c8cea851e4095f454b
Content length569 bytes
Content preview (first 800 chars) 
{
  "ciks": [
    "0000876883"
  ],
  "period_ending": "2025-12-31",
  "file_num": [
    "001-13718"
  ],
  "display_names": [
    "Stagwell Inc  (STGW)  (CIK 0000876883)"
  ],
  "xsl": null,
  "sequence": "3",
  "root_forms": [
    "10-K"
  ],
  "file_date": "2026-03-13",
  "biz_states": [
    "NY"
  ],
  "sics": [
    "7311"
  ],
  "form": "10-K",
  "adsh": "0000876883-26-000010",
  "film_num": [
    "26751596"
  ],
  "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/63854/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/63854/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/63854/receipt.json