I can’t believe I’m sharing an article by ABJ for positive reasons (in the topic title). See below.
It describes how features of BIP47 help retain at least the basic level of bitcoin anonymity. Now, this isn’t an issue for Safecoin, because it is truly anonymous. However, I think it’s useful for anyone considering the design of wallets and Safecoin handling, to see how things can be used in ways that have undesirable consequences - destroying anonymity for example. So worth reading all the same.