Media ebuilds.
With paludis: see Paludis repository configuration
With layman:
layman -f -o https://raw.github.com/hasufell/media-overlay/master/repository.xml -a media-overlay
All commits on the first parent (at least) are signed by me. You can verify the repository via:
[ -z "$(git show -q --pretty="format:%G?" $(git rev-list --first-parent master) | grep -v G)" ] && echo "verification success" || echo "verification failure"
If the verification failed, you can examine which commits did via
git show -q --pretty="format:%h %an %G?" $(git rev-list --first-parent master) | grep '.* [NBU]$'