Hi,
I saw someone talking about dirty BTC/USDT, is this real or a scam? Where can buy or exchange it?
It is the government and some anti-Bitcoin forces that always come up with the concept of dirty Bitcoin. They insinuate that dirty Bitcoin has been associated with illegal activities such as money laundering, drugs, hacked wallets, scams, etc. But the bottom line is that there is nothing like dirty Bitcoin. Just like fiat, Bitcoin can be used by criminals and this action doesn't make the money dirty. I recently read that 80% of fiat currency has been used for illegal activities. It will be difficult to identify these so-called dirty coins except the address was flagged and blacklisted by government agencies. Why do you want to be involved in such a transaction? The dark web might be a good place to ask this question.
It's precisely governments and anti Bitcoin forces that can label Bitcoin that is seized from money launderers, hackers and other criminal activities as dirty Bitcoin, instead of calling it seized Bitcoin. The fact however remains that Bitcoin is not a dirty cryptocurrency or digital cash, it is decentralized and is hodled and spent by legit individuals and institutions including criminal individuals and organizations. I wonder if seized fiat currencies are called dirty, I seriously doubt it, but it's very convenient for people who wants to give Bitcoin a bad name to call it dirty and tainted and they will still go ahead to sale what they termed as dirty and tainted.
I'm also curious at why the OP will ask where to buy dirty Bitcoin, like you I believe that the best place to make such enquiry is in the dark web. A reputable forum like bitcointalk is not the right place to get information about illegal activities.