hi all. i have 2 questions. 1.how in hell does paper wallet work ? if i do it offline no one knows the private key.so if nobody know the private key.is it really gonna work ? i think the private key and public key have some connection between them made by some algorithm. but in that case,all a hacker needs to do is find this algorithm and that's it.right ? 2.i tried a little test and send like 5 reddcoins to a paper wallet i did. now i wanna see that i can spend them,how do i now return it to my bittrex account ? thank you very much!