On Special:RecentChanges, if I'm an admin, block log entries look like:
# (Block log); 22:36 . . Foo (Talk | contribs | block) blocked Somebody (Talk | contribs) with an expiry time of indefinite (account creation disabled, cannot edit own talk page) (Comment about block)
I would expect there to be an "unblock" link in the (Talk | contribs) links for Somebody. So the line should look like:
# (Block log); 22:36 . . Foo (Talk | contribs | block) blocked Somebody (Talk | contribs | unblock) with an expiry time of indefinite (account creation disabled, cannot edit own talk page) (Comment about block)
I thought this was the case in 1.16, but can't remember for sure.