Fantastic puzzle! I've got them all except "string whose SHA-256 hash ends in '…689510285e212385'". How am I ever supposed to guess that? What does Randall think I am, a supercomputer?
has anyone converted into a format we can load into <a href="https://squares.io/" rel="nofollow">https://squares.io/</a> ?
If you want the answers, you can find them here: <a href="https://www.explainxkcd.com/wiki/index.php/2957" rel="nofollow">https://www.explainxkcd.com/wiki/index.php/2957</a> (great site for when you don't get an xkcd joke). But, really, give it a try on your own first.