I like the idea but doubt that would work out, at least not in my environment. I think this can only work if you use your credit card everywhere and always, else you would have to write down your expenses yourself and we know nobody would do that.<p>Then a lot of payments show up as rather generic. You would need to map a lot of &quot;Payment Messages&quot; to a topic, again something i think i would not do.<p>I think i could see that working rather in a Bitcoin only environment than anywhere else.<p>But then again, there apparently are americans who use their credit cards all the time and for everything. This might be just a american thing i cant understand.