Yes I meant what I said, let's say you have fiat and you don't want to buy coin from  exchange since you want to remain anonymous and you decided to look for vendor that will sell to you through non Custodial wallet pear to pear, like sending from electron wallet to electron wallet or meta mask to meta mask, and unknowingly to you that such person got his Bitcoin from scamming someone online and he eventually sent it to you in exchange of fiat without your knowing, do you know that such person might put you into risk? Because if that buyer don't have anyone to sell that coin via wallet p2p and he decided to sell it on exchange, the person can be traced and apprehended as a crimina because he will be seen as the criminal because his identity will be traced from his KYC on exchange Because the transaction has been traced in the Blockchain.

Now my main aim of creating this thread is that a friend asked me to send my BTC wallet address so that he can send me Bitcoin for me to sell it and send him fiat, but I am curious because of my safety since I don't know the source of his BTC if he got it by scamming someone. A thought cam to me that this might be a risky transaction and I don't want to send him my exchange wallet address.

My question now is that to be on a safer side which wallet is best needed for me to send him for transaction that can not be traced even though I am not sure if it's from a scam wallet or not.