Writing tweets for crypto trading

Question:

I've written 60 tweets for a person who teaches crypto trading, so that he can post those tweets on his Twitter account. He paid me $100 for this. Is it permissible for me to use the money as I've worked for him?

Answer: 

Assalamualikum wa rahmatullahi wa barakatuhu 

In the name of Allah the most Gracious the most Merciful 

It will be permissible to use the money you've earned this way, however, Islam always asks us to exercise caution in dubious matters, crypto trading is still not something that our scholars have deemed permissible, so if your tweets were about how to bring people into crypto or just advertise it, it will be considered assisting in sin is Islam. 

I advise you to not engage in this any further and pursue other halal avenues. 

And Allah knows best 

Mufti Umer Farooq Saleem