No, I am quite certain there is no record of member-to-member transfers outside of Silk Road. When you deposit to your SR bitcoin address, those coins actually bounce right off that address and are automatically sent on several times over -- that's the built-in mixer mixing them all up. It just credits your account with the coins in SR's database; when you transfer to another member, no actual coins are involved. It's just adjusting the SR database, that's all.Be warned though! I am not a vendor and have never had experience with such an account. I don't know if that's true of coins that come out of escrow and go to a vendor's balance. Those could be actual coins, I have no clue.