Chain of custody receipt

Source #110

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 filing
Original URLhttps://efts.sec.gov/LATEST/search-index?q=%22HPSP%22&dateRange=custom&forms=4,SC%2013D,SC%2013G,DEF%2014A,10-K,10-Q
PublicationPublic Record Research
Source typeweb_search
Date2024
EntityHPSP
Captured2026-04-05T07:51:15.103Z UTC
Hash computed at2026-04-05T07:51:15.103Z UTC
SHA-25636a98972e9d26e882aa398a7a5d1277ada2daf8b434d1230ddad2cb208bd6187
Content length1,022 bytes
Content preview (first 800 chars) 
{"took":4303,"timed_out":false,"_shards":{"total":50,"successful":50,"skipped":0,"failed":0},"hits":{"total":{"value":0,"relation":"eq"},"max_score":null,"hits":[]},"aggregations":{"entity_filter":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[]},"sic_filter":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[]},"biz_states_filter":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[]},"form_filter":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[]}},"query":{"_source":{"exclude":["doc_text"]},"query":{"bool":{"must":[{"match_phrase":{"doc_text":"HPSP"}}],"must_not":[],"should":[],"filter":[{"terms":{"root_forms":["4","SC 13D","SC 13G","DEF…

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/110/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/110/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/110/receipt.json