DeepOnion is a very promising PoW + PoS hybrid cryptocurrency, focused on privacy and anonymity. Since it has Tor natively integrated in the client, IP addresses of its nodes stay hidden at all times. Recently the DeepVault feature was added. It allows anybody to store a hash code of any file directly on the DeepOnion blockchain, which can be used to check / prove whether the file / document was modified or not, show when it was first recorded on the blockchain atc. The devs are currently working on the DeepSend feature, which should be implemented before the end of the year. It is basically an integrated coin mixer, which will (on top the hidden IP addresses) render all transactions within the DeepOnion network untraceable. The network will thus be completely private and anonymous (hidden IPs + untraceable payments).
Last but not least, I have to say that I’ve never before seen such big, active and supporting community as DeepOnion has, which gives the coin huge power. Huge dedicated community, very active developers, unique features.