I've been thinking exactly along those lines. Max (nprofile…u8g0) makes the case that Bitcoin is a better store of value than XMR in his "Praxeology of privacy". So then, why not use the properties of XMR to anonymize one's BTC? A swap to XMR and then back to a freshly created BTC adress. Wouldn't this anonymize BTC? Of course then it's all about it's use, careful management and so on but at least source of funds should be pretty hard to figure out shouldn't it?
