Block visibility - load/show block only once

Hi,

I'm trying to find a way to display one block to the users only once. It doesn't matter if they are logged in or not. So, let's say I have a block with the text:

"Hi, welcome to example.com".

I want this message to be loaded in my html code only once for every visitor. The information about it is saved to the cookie and the message won't be displayed anymore unless they delete a cookie.

I tried to find any advice on this on Drupal.org, but unfortunately without success.