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Proof of Existence

Cryptographic timestamp certificate for an archived snapshot
Archived page
https://aschellcompany.com/
Title
A Schell Company
Captured
2026-07-15T18:35:31.851036+00:00
Stamped
2026-07-15T18:38:46.910450+00:00
Files committed
88 files · 1756.4 MB
Bitcoin anchor
⛓ submitted — awaiting Bitcoin confirmation
RFC 3161 timestamp
✓ signed by freetsa.org  Jul 15 18:38:47 2026 GMT

Root hash (SHA-256 of manifest.json)

b2cc2d2cf6cd404a8b57a89f18370df1111f29b8be6c66be68f20d071e6147f2

Every file of the snapshot is hash-committed in the manifest; this single hash therefore fingerprints the entire artifact. Changing even one byte of any archived file produces a different root hash and breaks both proofs below.

Download proof bundle (.zip)

The bundle is self-contained: manifest, both proofs, the timestamp authority's certificates, and step-by-step instructions. Verification requires no access to this server and no trust in its operator.

How anyone can verify this — even decades from now

  1. Files match the manifest — hash each snapshot file with sha256sum and compare against manifest.json; then confirm sha256sum manifest.json equals the root hash above.
  2. Bitcoin anchor — with the open-source OpenTimestamps client: 
    ots verify manifest.json.ots -f manifest.json
    This proves the root hash was committed to the Bitcoin blockchain at the attested time. Forging it would require rewriting Bitcoin's history.
  3. Independent authority signature — fully offline: 
    openssl ts -verify -queryfile request.tsq -in timestamp.tsr \
    -CAfile tsa-cacert.pem -untrusted tsa.crt
    Expected output: Verification: OK.

Network provenance

DNS at capture
aschellcompany.com → 216.82.33.44
TLS certificate
CN = aschellcompany.com
issuer: C = US, O = Let's Encrypt, CN = YE1 · chain of 4 · saved as server-cert.pem
HTTP conversation
capture.warc.gz — every request/response with full server headers (Date, ETag, CDN routing), ISO WARC format
Independent archives
Wayback Machine (20260715)
independent third-party copies — corroboration that does not rely on this server
Per-file hashes (88 files)
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