comment_id
The comment_id tag is a single tag which is used to display the comment’s internal id as assigned by Textpattern at the time of posting. Used in a comments display form.
Comments Display Form with linked comment id
<txp:comment_message />
<p><small>— <txp:comment_name /> <txp:comment_time />
<txp:comment_permlink><txp:comment_id /></txp:comment_permlink></small></p>
Other tags used: comment_message, comment_name, comment_permlink, comment_time