Chain of custody receipt

Source #66864

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.

Title	SEC EDGAR: D/A — Blockchain Capital IV, LP (2018-03-22)
Original URL	https://www.sec.gov/Archives/edgar/data/1719278/000171927818000001/0001719278-18-000001-index.htm
Publication	SEC EDGAR
Source type	`sec_filing`
Date	2018-03-22
Entity	Blockchain Capital
Captured	1970-01-01T00:00:00.000Z UTC
Hash computed at	2026-06-01T01:43:10.924Z UTC
SHA-256	`1569bc7477a9b85aaecd82801c4676fffcdb4632594fe2ffabfccedce2a868d9`
Content length	620 bytes

Content preview (first 800 chars)

{
  "ciks": [
    "0001719278"
  ],
  "period_ending": null,
  "file_num": [
    "021-296805"
  ],
  "display_names": [
    "Blockchain Capital IV, LP  (CIK 0001719278)"
  ],
  "xsl": "xslFormDX01",
  "schema_version": "X0708",
  "sequence": 1,
  "root_forms": [
    "D"
  ],
  "file_date": "2018-03-22",
  "biz_states": [
    "CA"
  ],
  "sics": [],
  "form": "D/A",
  "adsh": "0001719278-18-000001",
  "film_num": [
    "18705769"
  ],
  "biz_locations": [
    "San Francisco, CA"
  ],
  "file_type": "D/A",
  "file_description": null,
  "inc_states": [
    "DE"
  ],
  "items": [
    "06B",
    "3C",
    "3C.1"
  ]
}

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:

Take the URL field and the original document content.
Concatenate url + '\n' + content and SHA-256 it.
Compare to the SHA-256 row above.

Or POST the candidate content to /source/66864/verify and our server will compare for you:

curl -X POST https://www.goblinhouse.net/source/66864/verify \
  -H "Content-Type: text/plain" \
  --data-binary @document.txt

Companion machine-readable receipt: /source/66864/receipt.json