Chain of custody receipt

Source #29716

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.

TitleCorporate event: NVIDIA awarded DARPA PERFECT program contract worth up to $20 million to researc
Original URLhttps://nvidianews.nvidia.com/news/nvidia-receives-darpa-contract-worth-up-to-20-million-for-high-performance-embedded-processor-research-6622726
PublicationMarket handoff
Source typemarket_handoff
Date2013-01-04
EntityNvidia
Captured2026-05-02T07:45:21.897Z 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/29716/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/29716/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/29716/receipt.json