Is the coin mixing process in SBC currently active? Or in development? If i understand correctly how the SBC coinmixer works it basically means this currency wont be decentralized.
This project called Zerocoin
http://zerocoin.org/ seems to aim to provide what Stablecoin is providing in terms of anonymity but they can accomplish it without a centralization. However, they are not a coin but rather a protocol that gets added ontop of another coin (like Mastercoin) so they need a partner it seems.
Maybe SBC & Zerocoin could work together considering how they have similar(identical?) goals? If this could make SBC anonymous AND truly decentralized then I think we would have a winner.
Zerocoin actually is a bit less secure, as all that needs is somebody to figure out the private key, which at least one person will know at launch. Stablecoin, if I'm not mistaken, mixes up the private key regularly, and an attacker would need physical access to the key nodes.