Chain of custody receipt

Source #9540

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 — Michael M. Crow (2021-03-15)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22Michael%20M.%20Crow%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typeweb_search
Date2021-03-15
EntityMichael M. Crow
Captured2026-04-13T21:16:50.958Z UTC
Hash computed at2026-04-13T21:16:50.958Z UTC
SHA-256d977e158425fd3322e9f6259a61c8c238b274060cdc1ffa6e7851f5377ec0584
Content length52,261 bytes
Content preview (first 800 chars) 
{"took":1681,"timed_out":false,"_shards":{"total":50,"successful":50,"skipped":0,"failed":0},"hits":{"total":{"value":90,"relation":"eq"},"max_score":20.395414,"hits":[{"_index":"edgar_file","_id":"0001445305-21-000048:poa.htm","_score":20.395414,"_source":{"ciks":["0001244046","0001445305"],"period_ending":"2021-03-11","file_num":["001-36773"],"display_names":["CROW MICHAEL M (CIK 0001244046)","WORKIVA INC (WK) (CIK 0001445305)"],"xsl":null,"sequence":2,"root_forms":["4"],"file_date":"2021-03-15","biz_states":["IA"],"sics":["7372"],"form":"4","adsh":"0001445305-21-000048","film_num":["21741727"],"biz_locations":["","Ames, IA"],"file_type":"EX-24","file_description":"POWER OF ATTORNEY FOR: /S/ BRANDON E. ZIEGLER AS ATTORNEY-IN-FACT FOR MICHAEL M…

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/9540/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/9540/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/9540/receipt.json