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----- iEYEABECAAYFAltCDP4ACgkQqesEzEdeXBFPlACcDg91qogTmt+7GYF5TdSBQ0GZ zO4An1Y+KwFo1ltdvuB1PBJN17PbfpS7 =xG1C -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. opencv-126.96.36.199-x86_64-1gds.txz.asc) in the same directory where the package file (opencv-188.8.131.52-x86_64-1gds.txz) resides and you can verify it by issuing the following command:
gpg --verify opencv-184.108.40.206-x86_64-1gds.txz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY