Darkcoin's Competition
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as the dust settles it gets clearer that there are no alternatives at the moment
XMR is a valid competition. Blockchain bloat is not a valid cause of concern to the investor types. XMR is also undergoing nice development work just like DRK.
However, it really depends on what Evan's plans are for RC4 and beyond. He could do a Ring Signature port if needed, but I believe he might have even better enhancements lined up. The path would be
CoinJoin+ -> RingSig+