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Timestamp Your Documents

Secure proof of your file’s existence using blockchain technology.

Drag & drop your 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:

  1. Upload your file – it stays in your browser, never sent to our servers
  2. A cryptographic hash of your file is created
  3. This hash is timestamped on the Bitcoin blockchain
  4. 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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