- P2P connection encryption

- Address re-use/payment protocol

- CoinJoin and merge avoidance

I don't think there's anything much new here for people who were involved with the BIP70 design discussions, but it may prove a useful resource when talking about privacy features in the payment protocol. Specifically the ability to request multiple outputs and submit multiple transactions that satisfy them. The article elaborates on how to use that feature to achieve some useful privacy outcomes.

I also analyze what using SSL for P2P connections would buy us and what it wouldn't.