I would say you shouldn’t have involved your self in telling him where to invest the money
Giving him the advice for investment was just okay you would have skipped the part of the exact place to invest on. Let him do the critical thinking of where to invest so as to be able to take the risk to himself knowing that he gave himself the idea of choosing where he invested … This is just my opinion 🤷🏼‍♀️

And again giving your friend an advice that you aren’t sure of is wrong , now you’ve given him advice to invest on Bitcoin and you’re here asking if that was a good idea. Makes no sense to me tho