As a recipient, how can I check the integrity of the file sent to me?

When you receive a Pronotif certified electronic notification with an attachment, click on the attachment you wish to download. You will then be redirected to a page like this one: 

Before downloading your file, if you wish or have any doubts, you can check the integrity of the file. 

To do this, go back to the certified notification you were sent, then click on the "proof report" button. Once the proof report is displayed, copy the list of characters corresponding to the SHA256 checksum (top right of the report): 

This character string is unique to each file. 

Then just copy this string here: 

If the document is intact, a green check mark will appear at the end of the field. 

Otherwise, a red cross will appear. 

Example: 

If this is the case, please contact the sender for further explanation and/or a new certified notification.