It doesn't have to work 1:1 all the time for every IP a person may use to make transactions. Unlike in torrents where one download cannot be tied to another and

It doesn't have to work 1:1 all the time for every IP a person may use to make transactions. Unlike in torrents where one download cannot be tied to another and you have plausible deniability that you yourself might've not used that, with bitcoin the history stays. As an example if you issue transactions from your home and from your place of work you are immediately nailed (e.g brought to questioning) even if there are 1000 transactions in your walled made behind 7 proxies. Open WiFi argument doesn't hold water in that case. And even a single access from a place that maps to someone will taint the wallet permanently, as an example: Busting a drug ring. Set of wallets are suspected to be a part of a massive drug and money laundering operation (few of the wallet addresses are advertised on silk road and are getting a lot of transactions in, and a bunch of laundering addresses are recognized as a dense cluster in the graph).Then some not so smart subordinate accidentally uses a wallet app from his normal cellphone. That will instantly cause the cops to go after him and investigations will start. Basically if you have ever used your wallet from places where you can be recognized the wallet is tainted. You will be investigated if the said wallet is ever used for anything shady ever. The key here is that even if a single access does not automatically link it to you, multiple accesses will. The only way to keep clean is always route every transaction always trough weird proxies. And hope that everyone you transfer to/from will do the same. Get a gift from your mom who doesn't do it? That's it. She may be interrogated and you're bust.