I have heard of bitcoin "washing" sites but I don't know how well they actually work.
It anonymizes by taking it in from one wallet, combining it with bitcoins from other accounts, and then returns it to another wallet you control.
so it is known what addresses paid in and paid out of the pool.
If you wanted to hire a hitman the state would know that you bought that $10k of BTC, and they would see that $10k of BTC go into a pool. They would see the hitman paid out of that pool (maybe with another hop). So the paper trail would have a break in it, but could kind of get tied to you.
You need to do face to face with someone you don't know, maybe with a 3rd party to escrow, that's really the only way.
Only use coinjoin or whirlpool.
So wasabiwallet (computer) or samurai (android)
It's programed in you get paid.
All others you give up your coins and open yourself up to not getting anything back.
They don't they just mix it up you can programmatically reassemble everything. That's why privacy coins are more appealing because with Bitcoin there's zero privacy everything you buy gets traced directly back to you because the computer can piece it together.
Walletexplorer for an example.
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