Implement CoinJoin using Darkcoin as a model

CoinJoin is an important and practical method to provide privacy on transactions. Darkcoin has found a way to implement CoinJoin directly in their protocol. I would like to include this in Nu, preferably as an enhancement after initial release. My guess is adding it as a hard fork is feasible, but we should confirm this with some research. In the unlikely case that it needs to be added to the initial implementation in order to be included, we would likely do that.

It would not even require a fork. This is indeed a protocol change but at the network level, not at the blockchain level. So if we implement that later users will only be able to mix transactions with other users who also upgraded, but we won't require everyone to upgrade.

Some sources:

• http://bitcoin.stackexchange.com/questions/24128/can-darkcoins-darksend-be-implemented-on-top-of-bitcoin
• http://www.reddit.com/r/DRKCoin/comments/1zlv36/what_does_darkcoin_offer_that_couldnt_be_done/