The World Copyright Office then?
Oh wait, three seconds of googling suggests my posts are most likely covered when I post via my home instance in Australia.
“You don’t need to register for copyright in Australia. The moment an idea or creative concept is documented on paper or electronically it is automatically protected by copyright in Australia. Copyright protection is free and automatic under the Copyright Act 1968.”
How about you read the very first sentence of my little snippet again.
The very first sentence.
The sentence that says, “You don’t need to register for copyright in Australia.”
You know, the sentence that effectively describes what needs to happen if you’re thinking about registering copyright in Australia.
Perhaps in your country you have to register works for copyright so that the courts will recognise your claims of infringement. Other countries, maybe not so much.