[Edit: all used up.]
Each works for only one signup, so hurry up :-)
By the way, most users get around 20 free invites shortly after signing up. If one of the links above opened your account, why not share five of your own invites afterwards?
Edit: 25 people from HN now have a keybase account.
Should anyone care, you can use:
$.makeArray($("input.form-control[value]").map(function() {return $(this).val();})).join(" ")
https://keybase.io/inv/d1439a90ad
https://keybase.io/inv/19ff7aba7d
https://keybase.io/inv/214f008a4f
https://keybase.io/inv/19949fe9a1
https://keybase.io/inv/8c0d7ab033
https://keybase.io/inv/6e0e648a78
https://keybase.io/inv/02bfae461c
https://keybase.io/inv/b643f5505