Chain of custody receipt

Source #29046

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.

TitleThe Creation of the National Imagery and Mapping Agency: Congress's Role as Overseer
Original URLhttps://www.hsdl.org/c/abstract/?docid=17280
PublicationJoint Military Intelligence College — JMIC Occasional Paper No. 9
Source typeexternal_handoff
Date2002-04
EntityNational Imagery and Mapping Agency
Captured2026-05-02T02:46:06.839Z UTC
SHA-256No hash captured. This row predates the chain-of-custody system OR no raw_content was stored.

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/29046/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/29046/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/29046/receipt.json