~/guix master λ guix download 
ftp://sourceware.org/pub/lvm2/LVM2.2.03.10.tgz

Starting download of /tmp/guix-file.J33OOi
From ftp://sourceware.org/pub/lvm2/LVM2.2.03.10.tgz...
 LVM2.2.03.10.tgz  2.4MiB 
 1.2MiB/s 00:02 [##################] 100.0%
/gnu/store/r9g36syz9yhgyx5mjnq6xvdhmfxg8aw4-LVM2.2.03.10.tgz
1l0fkn9abrgk5mfn6jfh9qhdr86b59l1c5pk6lp8jh0491d69las