I recently was notified that some channel (not user) subscribed to my youtube channel.
I want to block this channel because I believe it is a troll. However, I can't find a way to do this.
I found a lot of links that explain how to block a user, but not a channel.
Best Answer
The channel is the user. They are the same. If you go to the channel, and click the little arrow/gear in the top right, you can block them.
Also, you should try blocking the Google+ user/page associated with the youtube account.