This paper discusses the bandwidth and processing costs of a PSS algorithm www.cs.berkeley.edu/~dawnsong/papers/stream-search.pdf Right now the only missing piece of the puzzle is censorship resistance. I still have not found a way to allow a server to host content that it might itself be able to download, without it being able to remove the content from itself. I am not sure if it is even possible. Perhaps we will need to use multiple PSS servers and hope they do not all censor content, but this requires us to bring traffic analysis into more consideration. Anybody have any thoughts?