I think $50 is above the student loan limit. I am only 37 years old and don't have that kind of money.
Yeah, I wonder how he knows that you are 37 years old... I honestly don't get it. I didn't think even any scammer would be this stupid. There's absolutely no chance on earth you are getting a Ph.D out of anything with this IQ.
I can give my identity, no problem!
So can you explain please? If I lend you 10
BTC and you default, how will I get back my money? Sell your name or ID? I don't see that happening. Sue you for defaulting? Not gonna happen, since your ID might as well be fake or stolen. Seriously get a grip...
One option would be OP making an official contract and signing it (of course hoping that OP lives in a country that respects contract between persons)?