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But posting comments to Blogger with OpenID doesn't work and lots of bloggers are facing the issue Your OpenID credentials could not be verified. This problem is not only for BlogSpot users but also for WordPress bloggers who are also facing such errors. There is no error with your WordPress plugins nor with your cache. Want to get out of this error?
Learn how to use your BlogSpot or WordPress blog URL to comment as OpenID and how to fix 'Your OpenID credentials could not be verified'. This is also one of the best blogging tips to follow. Learn more about open ID and blogger or WordPress.

Also, read: How To Setup Free CloudFlare CDN | Speed up Blogger Site
What is OpenID
OpenID is an open standard that allows website owners or bloggers with OpenID-enabled services to log in with their name as their web link as OpenID.It occurs just because the system cannot verify the OpenID URL with the blog, so to solve this you need to add a few markup lines into HTML code of the page. It's so simple, follow below steps;
Fix 'Your OpenID credentials could not be verified'
- Open HTML code of your site.
- Find
<head>
section. - Add following code just below
<head>
tag.<link href='https://www.blogger.com/openid-server.g' rel='openid.server'/>
<link href='your-URL' rel='openid.delegate'/> - Replace your-URL with you blog-url.
- Save your template and you have done.