After you pay someone in DRK, is there a way to prove that you payed?
Yes, the receiver generates an address just for you. You transfer monies to that address. The blockchain shows that monies have been transferred to that address.
I thought the blockchain was hidden.
Sorry for noob questions.
No money is Pre-privatised. So you transact normally. The block chain is a fog in terms of working out who sent what where, but you and the person you payed still have your transaction ref.