"Even if it can be linked to an online wallet or exchange, you'll probably need a court order for this wallet/exchange to fork over the user's details, and even if you get those details they could be fake (fake id, one minute mail, proxy or vpn,...)."
but for example, if the receiver gave me his online wallet adress and just thinking, that nobody will try to search for him, then i think i still have some chance to find it out..? Police already know and strated investigation.
still hoping he not so competent, and asking for your help. If he is just a bitcoin beginner, and there is still chance to catch this shit, where should i start? If i will not do anything, so it means i lost money 100%, but hoping he left some footprints somewhere... who can help me? thank you very much