This all depends on where you are. In the US, you have to provide KYC information to get bitcoins so there will be a wallet tied to your personal identity. From

This all depends on where you are. In the US, you have to provide KYC information to get bitcoins so there will be a wallet tied to your personal identity. From there, you can follow the transactions on the blockchain and see where it leads. It isn't as easy as a subpoena to get information from a single company but it isn't like there is actual privacy either.