Chain of custody receipt

Source #61301

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 — Health Care Service Corp (2021-08-18)
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22Health%20Care%20Service%20Corp%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationSEC EDGAR
Source typesec_filing
Date2021-08-18
EntityHealth Care Service Corp
Captured1970-01-01T00:00:00.000Z UTC
Hash computed at2026-05-24T23:58:03.217Z UTC
SHA-256e55bdb0cd315700477a601cada9c2557431ed6568898dc5b1a0bc6902ed8f831
Content length571 bytes
Content preview (first 800 chars) 
{
  "ciks": [
    "0001588978"
  ],
  "period_ending": null,
  "file_num": [
    "333-258898"
  ],
  "display_names": [
    "PROCEPT BioRobotics Corp  (PRCT)  (CIK 0001588978)"
  ],
  "xsl": null,
  "sequence": 1,
  "root_forms": [
    "S-1"
  ],
  "file_date": "2021-08-18",
  "biz_states": [
    "CA"
  ],
  "sics": [
    "3841"
  ],
  "form": "S-1",
  "adsh": "0001628280-21-017245",
  "film_num": [
    "211186715"
  ],
  "biz_locations": [
    "Redwood City, CA"
  ],
  "file_type": "S-1",
  "file_description": "S-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/61301/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/61301/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/61301/receipt.json