User talk:El fo0

December 2017
Hello, I'm Velella. I noticed that you made a change to an article, Cryptocurrency exchange, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you.  Velella  Velella Talk 15:50, 31 December 2017 (UTC)