EXHIBIT A · TECHNICAL RECORD

Master Bathroom

Tour Session/Move-Out·22 Oct 2026 · 19:10:00 UTC

1147 Stanyan Street, Apt 3, San Francisco, CA 94117

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RECORD UUID550e8400-e29b-41d4-a716-446655440000
§ I

Cryptographic Hash

ALGORITHM · SHA-256
SHA-256 · 256 bits · hex
008c9e 7f4d 2b1a 3c5e106f8d 0c1b 2a3f 4e5d206c7b 8a9e 0d1c 2b3a304f5e 6d7c 8b9a 0123
Re-compute against the downloaded video file: shasum -a 256 master-bathroom.mp4
§ II

RFC 3161 Timestamp

ISSUED · 22 Oct 2026 · 19:18:44 UTC
Issuing Authority
DigiStamp Universal TSAwww.digistamp.com
Issued At
22 Oct 2026 · 19:18:44 UTC
Policy OID
1.2.840.113733.1.7.23.3
Serial Number
7E:9A:C3:11:08:4B:DD:6F
Download .tsr Receipt

A binary RFC 3161 timestamp token. Independently verifiable with openssl ts -verify.

What is a Timestamp Authority?

A Timestamp Authority (TSA) is an independent third party that cryptographically signs a hash with the current time. The signed token proves the data existed at exactly that moment — neither RenterSeal nor the user can forge it after the fact. RFC 3161 is the standard governing how this works, and it is the same mechanism used by code-signing CAs and notarial archives worldwide.

§ III

Location

GPS · WGS 84
37.77729°N37.77689°N37.77649°N37.77609°N37.77569°N122.41818°W122.41768°W122.41718°W122.41668°W122.41618°WN≈ 30 M
1147 Stanyan Street, Apt 3, San Francisco, CA 9411737.776492° N   122.417183° W
Address
1147 Stanyan Street, Apt 3, San Francisco, CA 94117
Latitude
37.776492° N
Longitude
122.417183° W
Source
Device GPS · OS-level mock detection passed
§ IV

Chain of Custody

  1. Recorded
    Video captured on device · GPS attached
  2. Hashed
    SHA-256 computed locally before upload
  3. Uploaded
    Resumable transfer to GCS · encrypted at rest
  4. Timestamped
    DigiStamp Universal TSA · RFC 3161 token issued
  5. Verifiable
    This page · publicly auditable
§ V

Capture Metadata

Room
Master Bathroom
Session Type
Move-Out
Captured At
22 Oct 2026 · 19:14:22 UTC
Duration
1m 11s
File Size
77.4 MB
Device UID
A8F4·E712·9C0D(truncated)
Capture App
Vouch iOS 1.2.1 (build 487)
§ VI

Independent Verification

Verify this independently▸
1.

Download the original video

Save the file to your machine, then re-compute its SHA-256. The result must match the hash printed above to the byte.

curl -O /sample/master-bathroom-move-out.mp4
shasum -a 256 master-bathroom-move-out.mp4
# expect: 8c9e7f4d2b1a3c5e6f8d0c1b2a3f4e5d6c7b8a9e0d1c2b3a4f5e6d7c8b9a0123
2.

Download the RFC 3161 timestamp token

The .tsr file is a binary timestamp token signed by the issuing TSA. Verifying it requires only OpenSSL and the TSA's public certificate.

curl -O /receipts/550e8400-e29b-41d4-a716-446655440000.tsr
openssl ts -verify \
  -in 550e8400-e29b-41d4-a716-446655440000.tsr \
  -data master-bathroom-move-out.mp4 \
  -CAfile tsa-chain.pem
3.

Confirm the chain

If both checks pass, three things are mathematically true: the video is bit-identical to the one captured; the timestamp token was issued by the named TSA; and therefore this exact video existed at the moment shown above.