Comment in blog post is one way of increasing blog readers and reducing bounce rate and also getting increased traffic to your traffic. Sometimes you read a post and the post is an interesting or helpful one and want to appreciate the writer by commenting
on the post and suddenly a dialog box appear for you to enter a confirmation code or a capthca, some time it is helpful but in some cases it is not helpful and trying to avoid it is one important thing to know and here is a few step to take on how to avoid it.
Step 1: Type your comment in the comment section and select Google account to publish your comment; there you will be redirected to a Google sign in page
Step 2: Sign in with your Google account and the blog post you are commenting to will suddenly reload
Step 3: Select anonymous from the drop down box in the comment section and re-enter your comment
Step 4: Click publish and you are done.
After this you can comment on any blog post as long as you are signed into your Google account.

Hope this short tips was helpful.
Source: http://www.techskulz.com/2014/10/comfirmation-before-commenting.html