<link href='http://current-blog-page-url.blogspot.com/'rel='canonical'/>
But I feel it is quite wrong way they used.
Canonicalization is the solution for the duplicate content. But they added canonical tag for each and every page of my blog with the corresponding page link in HREF.
Read my post about Canonicalization : Understanding Canonicalization
In the case of Google blogspot the canonical tags should be appear for the label pages(eg: http://web-search-techniques.blogspot.com/search/label/Canonicalization). Because that is only the part in my blog content duplication happens.
What do you say?