Quote from: cryptosize on Today at 08:35:20 PM

Quote from: mindrust on Today at 08:21:30 PM

Quote from: BlackHatCoiner on Today at 08:02:59 PM

Why does the history matter? We all receive cash that has been used to buy or sell cocaine, we know it. So what? For once more, coin history a privacy problem, not a fungibility.

Let’s say you want to buy some bitcoins but you can’t buy it from an exchange for some reason and I happen to own some coins on sale. So are you telling me, it wouldn’t make any difference to you if I wanted to sell you some coins with very bad history? (Maybe Isis used my coins to fund their operations or I got my coins from an exchange hack and I am that hacker) I want to sell you my coins directly, without using any third party exchange/mixer. Would you take this deal?

According to your logic, you should.

If you say “no”, now you see why it matters.

What if someone tries to use LukeDashjr's stolen 216 BTC? (I have no idea if he got them back)
In that case I think it's fair to do some tracing and return them to the owner...
Drugs don't bother me that much TBH, but stealing someone's BTC is another thing.
Another possible scenario I can think of:
https://www.nasdaq.com/articles/house-sold-in-portugal-for-3-bitcoin-in-countrys-first-ever-direct-transaction
Let's say that you spent 3 BTC to buy a house...
What happens if the new BTC owner decides to deposit them to a CEX for instant fiat liquidation?
Most people will argue "hodl, don't sell for fiat", but personally I consider it a miracle for a no-coiner to accept BTC as a currency. Hodling/studying 4-year cycles takes another whole level of effort/discipline, so you cannot expect that from everyone.
What if that 3 BTC is deemed to be "tainted"?
Because, you know, when you buy a house, the state knows who you are, it's not an anonymous transaction for some weed, so prepare yourself for some trouble if even a single satoshi is deemed "tainted"... Shocked

Let's ask the question again but this time change it a little bit.

This time blackhat wants to buy some gold and I happen to have some gold on sale. Blackhat can't buy it from somewhere else for some reason and I am his only option. Here is the catch, I stole the gold coins from a jewelry store. I am a thief but blackhat doesn't know it. To him, I am a legitimate seller.

Would he take that deal?

I'd bet he would.