[throwmeaway33]

Is there no system to swap ownership of coins?

If not there should be. You send X amount of bitcoins to a middle man who then gives you X amount back. Technically they will be different coins and they'll go to a different account #, so you can't trace anything.

[stordoff]

Take a look at mixing services[1], which seek to do exactly that.

[1] https://en.bitcoin.it/wiki/Mixing_service

[dave1010uk]

I've heard that SatoshiDice is used for this. It's technically a gambling site but you can set the odds so you have a 98% chance of winning.

[noerps]

I am currently evaluating that.