A needed blockchain app

You snap a photo on your phone and want to publicly establish your possession of it as quickly as possible (say you are a working journalist). So an app will: copy the pixel data; append a 'password' (a random string or phrase that only you know) to it; create a (bitcoin/ether/litecoin) blockchain address from this data; send a fraction of coin to it so it will be incorporated into the next block; and then, seconds later, repeat the process for the photo data without the password, showing that your passworded version preceded the plain photo. Seems like something like this would have been created by now. Or has it?