Create a cryptographic timestamp for any file using the OpenTimestamps protocol. Upload a file to timestamp. The system computes the file hash and submits it to the Bitcoin blockchain via the OpenTimestamps network. This creates a permanent, verifiable proof that the file existed at a specific point in time. Once the timestamp is created, download the .ots file. Keep this file alongside the original — you will need both for future verification. ⚠️ Important: Download the .ots file before navigating away. You can also save a report in PDF, DOCX, JSON, CSV, TXT, XML, or HTML format.

Verify that a file matches its OpenTimestamp proof. Upload the original file and its corresponding .ots proof file. The system re-computes the file hash and compares it against the timestamp proof. If the verification succeeds, it confirms the file existed unchanged since the timestamp date. If it fails, the file may have been modified after the timestamp was created. ⚠️ Important: Download the verification report before navigating away. Save it in PDF, DOCX, JSON, CSV, TXT, XML, or HTML format.