By the way I did a quick audit of the code starting at Mark Pfennig (Nathan Rixham)'s initial "global rename" commit and indeed it seems to be an exact copy of Bitcoin Core v0.9.2.1, other than renaming "Bitcoin" to "Bitmark". I also looked at his other commits before and didn't find anything dishonest. Thus, I am very convinced now that the code is honest and secure (up to the security of Bitcoin Core v0.9.2.1). Yes Nathan ran away with people's money (from what I heard), but he didn't (from my audits) code anything dishonest into the protocol. It is unlikely he would put something malicious into the git commits since anyone can view them publicly, but of course it is worth checking it some more.