Since you ask:
A check has the din of a shtar (which is why someone who bounces a check is Pasul for Edus, due to Shtar Mezuyaf). A shtar according to many opinions has the din of Kesef (although not for Keddushin, see Rishonim there why). As such, if you give it directly to the Ani, it is giving Kesef. If you give it to the Rov and he gives out on Purim against the check, that will also be good.