This is the package signature as generated by The GnuPG. This signature identifies the party that created the package. By verifying it you are sure that the package coming from a trustworty person or organization.
Here is the package signature:
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAk9+C0sACgkQqesEzEdeXBFpxQCgoHWoL//Cx7SqEDHfkToZlmk5 w2gAn0MxD9CCw3XRm5vOl2wpxiatosgN =grNP -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. htop-0.9-i486-1gds.txz.asc) in the same directory where the package file (htop-0.9-i486-1gds.txz) resides and you can verify it by issuing the following command:
gpg --verify htop-0.9-i486-1gds.txz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY