Chain of custody receipt

Source #8130

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.

TitleResearch: Carl Wiersum — SEC filings (no results)
Original URL(none — typed-API result with no web URL)
PublicationSearch Scope Note
Source typesec_filing
Date2026
EntityCarl Wiersum
Captured2026-04-13T18:25:00.986Z UTC
Hash computed at2026-04-13T18:25:00.986Z UTC
SHA-256b6a43c7564e433f89bb47409fb41c24ad06e5729078c2843c6775533cd88c023
Content length205 bytes
Content preview (first 800 chars) 
No SEC filings found for "Carl Wiersum" in public databases or web search. This may be due to name variations, subsidiary filings, or limited search coverage — not necessarily absence from public record.

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/8130/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/8130/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/8130/receipt.json