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 v1.4.10 (GNU/Linux) iEYEABECAAYFAkx8DPMACgkQqesEzEdeXBHtXACgn8w8zNQmPKUrXYuXaeL2F8Hv sf8AoKO5nkd45C/ThZP1ZTP5fkAK+TFo =uZ3t -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. opera-10.61-i386-2gds.txz.asc) in the same directory where the package file (opera-10.61-i386-2gds.txz) resides and you can verify it by issuing the following command:
gpg --verify opera-10.61-i386-2gds.txz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY