Public keys for verification of signatures are the ones from koszko.org.
PGP key fingerprint: E972 7060 E3C5 637C 8A4F 4B42 4BC5 221C 5A79 FD1A
Signify public key: RWQSf2wUdpjAtrmt7D3t9iHrHFL/GpqXOF+NxECx8ck7swrx6tNzDkM9
Built from Git commit e9b6187e0c5eaa4ac5ee41aacb261ae2da208c8f
.