Chain of custody receipt

Source #43446

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 — Investment Security Unit (2025-11-07)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22Investment%20Security%20Unit%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typesec_filing
Date2025-11-07
EntityInvestment Security Unit
Captured1970-01-01T00:00:00.000Z UTC
Hash computed at2026-05-13T05:08:53.614Z UTC
SHA-256b9faff37de4f14216a5439a8a4070ac0d519da53f130155b4078e87f7e89dd88
Content length566 bytes
Content preview (first 800 chars) 
{
  "ciks": [
    "0000771266"
  ],
  "period_ending": null,
  "file_num": [
    "333-291345"
  ],
  "display_names": [
    "KOPIN CORP  (KOPN)  (CIK 0000771266)"
  ],
  "xsl": null,
  "sequence": 5,
  "root_forms": [
    "S-1"
  ],
  "file_date": "2025-11-07",
  "biz_states": [
    "MA"
  ],
  "sics": [
    "3674"
  ],
  "form": "S-1",
  "adsh": "0001493152-25-021128",
  "film_num": [
    "251460101"
  ],
  "biz_locations": [
    "Westborough, MA"
  ],
  "file_type": "EX-10.24",
  "file_description": "EX-10.24",
  "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/43446/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/43446/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/43446/receipt.json