Chain of custody receipt

Source #3307

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.

TitleGovernment contract justification documents
Original URLhttps://www.usa.gov/agencies/u-s-patent-and-trademark-office
PublicationDirected Inquiry — Web Search
Source typeweb_search
Date—
EntityImmigrationOS
Captured2026-04-09T14:03:11.840Z UTC
Hash computed at2026-04-09T14:03:11.840Z UTC
SHA-25691db02abf0501d2a926a51cb00e22bf267c663517c0be56e08d2a2433d1e931b
Content length58 bytes
Content preview (first 800 chars) 
Federal Contract ID for ImmigrationOS is 70CTD022FR0000170

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/3307/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/3307/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/3307/receipt.json