Hello, I want to buy bitcoin, how can I be sure that they were not used for any shady business?
We cannot decide it and we cannot guarantee it because it is like money, depending on how the holders and also the goals of using that money/Bitcoin. So, better to focus on yourself, use it depends on what you need to do in it, surely the Bitcoin is a worthy thing to invest.
If I buy directly from a person, what is the chance that I will have problems later? Do I only have to buy from exchanges?
Please, forgive my ignorance.
It relates to some probabilities if someday, you face certain problems or your transaction is not successful with that person, you cannot claim anything to them. And moreover, you may not need to believe someone that want to help you while selling or buying.
It is better to buy that in your local exchange that has certain regulations as accepted in a country.