Ja hatte ich mir auch schon gebookmarked (darf man das auf Deutsch so sagen??).
Hier eine Antwort aus einem englischen Post zu der Frage:
How is there ever a difference between the number of bitcoin sold and the number bought? How is this calculated?
Bitcoins sold is when a standing bid order is being sold into (price goes down), and bought is when asks are being bought into (price goes up). In both cases bitcoins are being bought and sold ofcourse, but the difference is direction and the one taking action.
Sollte glaube ich die Diskrepanz zwischen sold/bought klären.