Hey Spammer! From what I understand, you want to organize something like anonymous "people's CIA"? right? If yes, then your "PPI" system is too complicated. All you need are simple wishlists: *** I would donate for: mission - price mission - price *** "Agents" will track user's lists and fullfill the highest paying missions.
And there is absolutely no need to waste money! User can demonstrate his/her determinition to pay by making donations to well-known charity organizations. For example, every month: pay for completed missions - update and publish new wishlist - make small donation.
(...but, if you really give bitcoins, here is my address bc1qgrh4pvj0lhf0nm264sppuwa9l8pc6q2tys0vgc)