Chain of custody receipt

Source #1657

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.

TitleResearch: HPSP — SEC filings (no results)
Original URL(none — typed-API result with no web URL)
PublicationAI Analysis — no URL
Source typesec_filing
Date2026
EntityHPSP
Captured2026-04-07T04:22:43.895Z UTC
Hash computed at2026-04-07T04:22:43.895Z UTC
SHA-25606b1fbd92c6668d2114c0c3658daac56e6c319c1cb5608f665b29500553fa50a
Content length66 bytes
Content preview (first 800 chars) 
No SEC filings found for "HPSP" in public databases or web search.

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/1657/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/1657/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/1657/receipt.json