Chain of custody receipt

Source #4751

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 — Jan Koum (2016-06-17)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22Jan%20Koum%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typeweb_search
Date2016-06-17
EntityJan Koum
Captured2026-04-12T17:31:51.919Z UTC
Hash computed at2026-04-12T17:31:51.919Z UTC
SHA-256e8e027f89a297a28a799e26d8c0c9fca34f2af24ff82ec87d614f867c653b830
Content length45,760 bytes
Content preview (first 800 chars) 
{"took":789,"timed_out":false,"_shards":{"total":50,"successful":50,"skipped":0,"failed":0},"hits":{"total":{"value":76,"relation":"eq"},"max_score":30.040571,"hits":[{"_index":"edgar_file","_id":"0001127602-16-055831:form4.xml","_score":30.040571,"_source":{"ciks":["0001326801","0001621141"],"period_ending":"2016-06-15","file_num":["001-35551"],"display_names":["Facebook Inc (META) (CIK 0001326801)","Koum Jan (CIK 0001621141)"],"xsl":"xslF345X03","schema_version":"X0306","sequence":1,"root_forms":["4"],"file_date":"2016-06-17","biz_states":["CA"],"sics":["7370"],"form":"4","adsh":"0001127602-16-055831","film_num":["161721157"],"biz_locations":["Menlo Park, CA",""],"file_type":"4","file_description":"PRIMARY…

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/4751/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/4751/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/4751/receipt.json