Verification badges on channels
You'll see a verification badge next to a YouTube's channel name if it's linked with a verified Google+ page or profile.
When you see this verification check mark, it means that the channel officially belongs to the creator, brand, business, or organization represented by the channel. Having a verification badge doesn't affect search results for the channel or grant access to additional features on YouTube.
How to get a verification badge
YouTube doesn't accept general requests to receive name verification. If your channel meets the qualifications for verification, you may receive the verification badge. If your channel has fewer than 100,000 subscribers, it's usually not eligible for a verification badge.
If you change your channel's name, it will lose a verification badge if it has one. However, the channel will be automatically reviewed and receive a verification badge again if it meets the qualifications.