You may be interested in some thought experiments I'm running to try and achieve the aims of a verifiable public domain dedication under existing US law:

https://github.com/berneout

I'm also of the view that a truly irrevocable copyright waiver/dedication isn't currently possible under US law. We're not alone:

http://www.rosenlaw.com/lj16.htm

But you should be aware that others take a different view, if you're not already:

https://cr.yp.to/publicdomain.html

The most interesting reading I've done is probably the old CC mailing list threads on CC0-1.0's backup license. If you set yourself the goal of writing international/portable language, things get really hairy.