Timestamp Your Documents
Secure proof of your file’s existence using blockchain technology.
Drag & drop your file here or
Verify a Timestamp
Upload both your original file and the OpenTimestamps (.ots) proof file to verify the timestamp.
Original File
Drop file here or
Proof File (.ots)
Drop .ots file here or
What is OpenTimestamps?
OpenTimestamps is a service that creates blockchain-anchored timestamps, providing cryptographic proof that your document existed at a specific time.
How it works:
- Upload your file – it stays in your browser, never sent to our servers
- A cryptographic hash of your file is created
- This hash is timestamped on the Bitcoin blockchain
- You receive a proof file (.ots) to verify the timestamp
Benefits:
- Prove document existence without revealing content
- Immutable verification using blockchain technology
- Free and open-source solution
- No registration or personal information required
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