Do you mean blockchain.info? Because the block chain itself is not a bitcoin service. It's a record of all bitcoin transactions. Yes, you can transfer BitInstant -> blockchain.info -> SR. Some people move their coins through a few ewallets or mixing services. Keep in mind that the requirements of fast, cheap and anonymous tend to be mutually exclusive. You can do a cash deposit at a bank, or use an online vendor to trade a Moneypak, and get the coins fast and anonymous, but not cheap. You can do a bank transfer to an exchange and get the coins cheap, but not fast and anonymous. I am not aware of an online vendor who will trade bitcoins for a 1% fee. Such a person doesn't exist, although if you can find someone like that, you're golden.