I started discussing I2P on page 21 and the discussion continued until at least page 24 of the thread:

https://bitcointalk.org/index.php?topic=1049048.msg11842826#msg11842826

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Also I don't know where to find a technical description of ShadowCash's private messaging anonymity algorithm?? You can see my analysis of similar attempts on the prior linked and following linked post, and I very much doubt that ShadowCash is doing it correctly:

https://bitcointalk.org/index.php?topic=1049048.msg11844778#msg11844778

I am nearly certain that ShadowCash will have a flaw in it and that is probably why they are not detailing it in a white paper. They are hiding details.

Edit: Okay I found the ShadowChat white paper. I didn't know what to google for until just recently.

http://www.shadow.cash/downloads/shadowcoin-p2p-em.pdf

Section 3.3 Message Propagation makes it clear that is a Bitmessage-like clone. They are sending every encrypted message to every peer on the network, except grouped by 1 hour channels. So that means they send out a list of all messages to all peers, then peers only request an hourly channel which contains a message intended for them.

That is indeed Information Theoretic Security anonymity.

So thus I will give ShadowChat a thumbs up. This is the first proposal I've seen which is a potential alternative to Bitmessage.

From that description it may be feature incomplete from my perspective of what is really needed out by the market. And I will not detail now the other features I would like to see. They probably have many plans for the ShadowChat which I am not aware of.

However, I don't know if it can scale. That is one of the problems with Bitmessage. Imagine you have 1 million peers and you have to send a message digest to all of them. You can of course shrink the anonymity sets to the desired sizes by decreasing the channel width in time, but the digests still need to be sent to every peer. There are alternative ways to design the channels so digests are not sent to all peers. Appears they haven't done that yet.

Also there is no discussion of the spam resistance.

Again I am giving ShadowMarket a thumbs down.