I have already tried it with my first document, and it works great to protect and certify all kinds of documents through Blockchain technology. After an initial verification to verify the user in which you must upload to the platform a photocopy of your ID and an image in which you yourself hold the ID, the process is simple and fast. In addition, this offer belongs to a Spanish company authorized by the Spanish government to perform these functions. I am also happy with the attention received, since I had a couple of questions, and they answered me quickly and in a very satisfactory manner. Considering what you get for this deal at Appsumo, I think it's a great deal that you shouldn't pass up. I recommend you buy it before it disappears from Appsumo.