thanks for your opinions.
it s not about not-paying-me back at all. friend wants to pay but we cant agree upon which Price.
i mean 1600 Dollars is way too much. that s why i prefer Bitcoin. you simply just cant compare it to dec 2016. asking for that price is hilarious.
my friend has btc maybe 0.6 or something like that which would then be one sixth of his net-worth acquired by trading in the last 4 months.
but it is still the equivalent of 1600 Dollars right?
I think that it is definitely fair that he pays you the current price for those bitcoins. Unless you think that you would have sold them by now or would be hacked as well, it is fair to ask from him the amount you gave him.
You can always meet half way if you are not sure. Current price plus the price at that time, divided by two.
I can just say that I would definitely have not sold my bitcoins since then (as I didn't) and that I would never hold them in an online wallet or centralized exchange. I would always have my private keys on my computer and only there. So if I gave someone a loan in bitcoins, I would expect bitcoins in return.