Hello,

as a final not of this project README you've linked the A Treatise on Altcoins by A. Poelstra as a note on altcoins in general. I must warn you that this paper while it is quite popular and readily quoted is not a prime example of unbiased and elaborate research paper on topic of cryptocurrency.
I will just warn to statement made on Peercoin, a altcoin which I help to develop and maintain.

Author states:

... prototypical proof-of-stake currency, Peercoin, depends on developer signatures to determine block validity: that is, its consensus is not distributed.

Which is all but truth. If I understood the author, he states that every block on the Peercoin network must be signed by developer (Sunny King) to become valid, and thus network is not decentralized.
Which is far from truth, naturally. Each block is signed by whoever mines it or mints it.