Chain of custody receipt

Source #45259

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 — RMG Acquisition Corp. IV (2021-10-14)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22RMG%20Acquisition%20Corp.%20IV%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typesec_filing
Date2021-10-14
EntityRMG Acquisition Corp. IV
Captured1970-01-01T00:00:00.000Z UTC
Hash computed at2026-05-13T05:01:59.649Z UTC
SHA-256d69db975e0cd995d24fed96bfbdbeb1dfd8015e4d6d44e5112ae24ba759957de
Content length567 bytes
Content preview (first 800 chars) 
{
  "ciks": [
    "0001847455"
  ],
  "period_ending": null,
  "file_num": [
    "333-253637"
  ],
  "display_names": [
    "RMG Acquisition Corp. IV  (CIK 0001847455)"
  ],
  "xsl": null,
  "sequence": 4,
  "root_forms": [
    "S-1"
  ],
  "file_date": "2021-10-14",
  "biz_states": [
    "NY"
  ],
  "sics": [
    "6770"
  ],
  "form": "S-1/A",
  "adsh": "0001193125-21-298408",
  "film_num": [
    "211322661"
  ],
  "biz_locations": [
    "New York, NY"
  ],
  "file_type": "EX-5.1",
  "file_description": "EX-5.1",
  "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/45259/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/45259/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/45259/receipt.json