Why not zerocoin? Any unproven tech will need to be reviewed by cryptographic authority and we know that is not so easy.
I'll read Zerocoin whitepaper tomorrow and will think. Today is too late, time to drink milk and go to bed soon.
Their solution is ugly. It uses accumulators, requires large data amounts and has all sorts of restrictions.
If we could take the core idea and find a way to implement it in a simpler way, that would be fantastic...
I will also read and think more tomorrow.