On the Laravel News site there's a tutorial showing you how to use a feature that's been added in the latest release of the Laravel framework: signed routes. These signed routes allow you to create routes that work with signatures and help with their validation.

In the latest Laravel 5.6.12 Release a new signed URLs feature was introduced. In this article, we’ll work on enabling signed URLs in an application and look at a few options of how to use them.

The tutorial starts by helping you update your installation to the latest version and change the configuration to add the new ValidateSignature middleware to the route middleware list. They also provide an example of a route definition that contains several "id" type of values that could potentially be modified by an attacker. It then shows how to use the Url helper to generate a new signed route that includes a signature based on the URL contents. The tutorial also provides an example of temporary URL signatures that will include a timeout value as a part of the hash so it will expire after a certain amount of time.