There are some proposal such as CoinJoin which proposed by Gregory Maxwell, even though this idea isn't perfect and without proper feature upgrade/implementation, it will leaks users info. Some coin such as DASH already use CoinJoin, but many people say the implementation was done badly.
But, i think Bulletproof is proposal is better when users need privacy
More info : https://bitcointalk.org/index.php?topic=279249
But, i think Bulletproof is proposal is better when users need privacy
More info : https://bitcointalk.org/index.php?topic=279249
Thx - i think this could be a very interesting factor of a new coin which implement such a feature in a good way.