Commit 4c0d38b updates those 4 binaries for i686 and x86_64.  I took
them from
<ftp://alpha.gnu.org:/gnu/guix/bootstrap/{x86_64,i686}-linux/20131110/static-binaries.tar.xz>.
The commit itself is signed (see “git show --show-signature 4c0d38b”.)

Thanks,
Ludo’.