Bitcoin has a flaw. If a user is linked to one transaction in the blockchain, then other information about that user’s transactions can be deduced, including, in some scenarios, the user’s complete transaction history.
We’d like to fix this issue on the new privacy-oriented cryptocurrency Neutrino. See http://www.neutrinocoin.org and https://github.com/neutrinocoin/neutrinocoin for more info.
We know of three main solutions to this issue right now: Zerocash (the successor to Zerocoin), CoinJoin and Mixcoin. We’re not stuck on those solutions, though, if you know of another one or would like to create your own solution.
Please checkout this issue for relevant links for Zerocash, CoinJoin and Mixcoin: https://github.com/neutrinocoin/neutrinocoin/issues/2
You can contact us at email@example.com or @neutrinocoin on Twitter.