If I purchase bitcoins via p2p, can I get some problems if the bitcoins I get were involved in some criminal activity ? If yes then how do I avoid such situation ?
Well, those bitcoins might have been transferred many many many times before they might reach you! Basically the nodes that will keep creating further will have the connection to previous transaction (input and output, multiple) giving you extra layer of security. Yup many of them will say it could be traced but not down to the seed which was involved with criminal activity, cause that’s just impossible. It’s more or less mixing the coins continuously.
If you still think you received the coins which were involved with criminal activity then just hit Chipmixer, mix your coins and you have fresh lot of coins.