The content:// portion indicates an Android content URI, while cz.mobilesoft.appblock.fileprovider identifies the AppBlock FileProvider. The /cache/blank.html section refers to a temporary HTML file that can act as a placeholder when content is blocked.

Seeing this URI does not necessarily mean your phone has been hacked or infected with malware. It may simply appear when AppBlock redirects blocked websites to a local blank page. Developers may also encounter it while examining WebView behavior, application logs, or cached files.

If you've encountered this URI, understanding how Android Content URIs and AppBlock work can help determine what you're seeing.