Every certified press release includes a verifiable .tsr timestamp file. To confirm authenticity:
.tsr file provided with the press releasePrivacy: All verification happens locally in your browser – no data is sent to our servers.
For maximum independence and transparency, you can verify the .tsr file yourself using OpenSSL (available on Windows, macOS, Linux):
openssl ts -reply -in your_file.tsr -text
This command displays:
Compute the SHA-256 hash of your original PDF file:
On Linux/macOS:
sha256sum your_document.pdf
On Windows (PowerShell):
certutil -hashfile your_document.pdf SHA256
On Windows (Command Prompt):
certutil -hashfile your_document.pdf SHA256
The hash from Step 1 (in the .tsr file's "Message data") must exactly match the hash from Step 2 (your document's calculated hash).
✓ If they match: The document is proven to have existed at the timestamp date and has not been altered since.
✗ If they don't match: Either the wrong document is being compared, or the file has been modified after timestamping.
The openssl ts -reply command will show something like:
Status info:
Status: Granted.
Status description: unspecified
Failure info: unspecified
TST info:
Version: 1
Policy OID: 0.4.0.2023.1.1
Hash Algorithm: sha256
Message data:
0000 - d2 be 81 54 43 7f e2 96-44 cd ad 1c 35 22 35 20 ...TC...D...5"5
0010 - b6 c2 58 ca ff ab 36 0b-cf 9f cf d4 7e 21 49 dc ..X...6.....~!I.
Serial number: 0x4735538544214581483
Time stamp: Oct 5 07:40:39 2025 GMT
...
Note: The "Message data" hex values (in this example: d2be81544...) must match your document's SHA-256 hash.
Before diving into the FAQ, here are some key concepts that will help you better understand how CertifiedPressReleases.com works:
What is a hash?
A hash is a unique digital fingerprint of a file or text. Even the smallest change in the file creates a completely different hash. We use the SHA-256 algorithm to guarantee authenticity and integrity.
What is a timestamp?
A timestamp is a digital proof of date and time, issued by a trusted authority under the European eIDAS regulation. It proves when a press release (or any digital file) was created or certified, and prevents backdating or manipulation.
What is a .tsr file?
A .tsr file (TimeStamp Response) is the official evidence provided by the certification authority. It contains the timestamp, the hash, and the signature of the trusted authority. This is the legally valid proof of certification.
What is a .json file?
A .json file is a structured text file containing all technical details of the certification, such as the hash, timestamp, and metadata. It is machine-readable and can be verified by forensic experts or legal authorities.
CertifiedPressReleases.com – The trusted platform for certified, tamper-proof press releases
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