Chain of custody receipt

Source #509

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: Invariant - government disclosure
Original URL(none — typed-API result with no web URL)
PublicationPublic Record Research
Source typegovernment_disclosure
Date2024
EntityInvariant
Captured2026-04-05T09:09:18.731Z UTC
Hash computed at2026-04-05T09:09:18.731Z UTC
SHA-2566f99c323f1da70187c2265ad18142ec9cc31bbfd33f158542815fec2293fd474
Content length408 bytes
Content preview (first 800 chars) 
Research into 'Invariant' in the context of government disclosure yields limited results, as 'Invariant' is a relatively common term used across multiple contexts including mathematics, software development, and various company names. Without additional specificity, the following represents documented public record information for entities and concepts matching this term in government disclosure contexts.

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/509/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/509/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/509/receipt.json