Before doing any SEO there should be a list of targeted keywords.
I don't think there is a big search volume for BitShares, POS, POW, DPOS etc right now though..
Later on, when BitAssets would be out, probably a bigger audience can be targeted, e.g. by "trading", "internet trading", "crypto trading", "short usd/btc", "derivatives" keywords.
Please keep in mind that SEO these days is a very delicate matter - some techniques used just several years ago might not work now and in the worst case scenario treated as spam. A very popular approach is natural SEO - just let it grow naturally, do a regular marketing, post to social networks, let people talk about and search engines will read all those signals and will rank your content accordingly.