I'm creating a website where people can sell and buy digital products like websites, domains, scripts etc. My question is how can I determine if the user who wants to sell his website is really the owner of the website and not just an administrator or a developer who has access to the files? If anybody can give my an answer on this and a reference of technology to use to verify the ownership would be really great. I'm using laravel 5.1 for this project. Thanks in advance
You simply ask the "owner" of the website to upload a file which has been created by you with either a random string name or includes a random string, which can only be recognized by your system.
You could upload these random codes to a MySQLi Database for reference.