I want to buy something on SR2, I will tumble the money I use to pay. I can do this with BTC I mined myself or I could buy some BTC from somewhere and then tumble that. What is safer/more anonymous?
If it's better to buy BTC, where is the safest place to do so?
i think it doesn't make much difference if you use mined or bought coins.
of course if you buy some coins with cash/meetup on localbitcoins.com (over tor) or with the buy function of the mycelium wallet there is little to no evidence that you even had coins. but unless you are planning on buying big amounts no cop will even try to follow the trail the coins left.