Chain of custody receipt

Source #80754

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.

TitleUSASpending.gov: LINDE INC. — National Aeronautics and Space Administration contract NNK10OO11D ($22.29M)
Original URLhttps://www.usaspending.gov/award/CONT_AWD_NNK10OO11D_8000_NNK09OO20B_8000/
PublicationUSASpending.gov
Source typecontract
Date2009-10-01
EntityxAI
Captured2026-10-03T13:46:58.585Z UTC
Hash computed at2026-10-03T13:46:58.585Z UTC
SHA-256543ba2dc88dfa6aec4a2b626ad8051e90b8006c173b26083eed61259ccc07056
Content length535 bytes
Content preview (first 800 chars) 
{
  "internal_id": 311401503,
  "Award ID": "NNK10OO11D",
  "Recipient Name": "LINDE INC.",
  "Award Amount": 22291461.05,
  "Description": "SUPPLY OF LIQUID HELIUM",
  "Awarding Agency": "National Aeronautics and Space Administration",
  "Awarding Sub Agency": "National Aeronautics and Space Administration",
  "Start Date": "2009-10-01",
  "End Date": "2014-09-30",
  "awarding_agency_id": 862,
  "agency_slug": "national-aeronautics-and-space-administration",
  "generated_internal_id": "CONT_AWD_NNK10OO11D_8000_NNK09OO20B_8000"
}

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/80754/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/80754/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/80754/receipt.json