Cannacoin-QT initial sync can take a very long time to complete. You should make sure that you have enough bandwidth and storage for the full block chain size. If you know how to download a torrent file, you can speed up this process by putting bootstrap.dat (a previous copy of the block chain) in the Cannacoin-QT data directory before starting the software.
660D D125 9178 C381 3532 8B93 40F0 57FC 3750 C4C7
Get from gpkeys:
$ gpg --recv-keys 3750C4C7