bitcoin.org was originally registered and owned by Satoshi, I recall 100% correctly ...
 
Satoshi registered the domain bitcoin.org on 18-Aug-2008 here;

- https://web.archive.org/web/20080624071959/http://www.anonymousspeech.com/default.aspx

The most likely method of payment being cash-in-the-mail.

This blog post is also highly factual regarding the subject ...

- https://whoissatoshi.wordpress.com/2016/01/27/digital-evidence/