I don't. The string at the end of my comments is a digital signature which serves as a means to verify that I was the one that posted it, and that it wasn't modified by an admin, or any other external entity.
content-signature:GHnwqVFVDJFDAGt7Xg1oQecp04BoH+qJucdpFOblrg+YxSx8Vp7DfxEQudqcxK1+7yiOjgKvnVDCRP6oU7XTjttdl6sdMpFq9LcFHQ6OlVtjsvaSoIobck4ARimWs5vvTYMTBp6kCNYmhczFniJ52q3Blps7G1bw5q7sOf1z4rWG+CB99jb//02+x6KVjllnoiZJdVhqfa69dryG49W8QxTLvHqr20kTmAQzEpAK/kWgGL2/FLNhUYjvmVQtQAUJlXo/GJtj93AHyrApqwXEVmGSe/imIrosGgugG3UZSRGJzYd+/KwOVxsZNkTe+eMIyV8ceeouy9LcorEKJ1mq/g==
For more in depth information, I'll refer you to this Wikipedia article on digital signatures. But, the long and short of it is that I distribute a public key which would be used alongside that signature to verify if that signature was generated by my private key for the content that is contained in the given post.