re: proof-of-stake and proof-of-work, an idea I have been working on as a contribution to the Bitnation project, is proof-of-power,
"Proof-of-power builds on the work of Vlad Zamfir, and uses a swarm to select validators, where people “power up” validators using proof-of-suffrage, and proof-of-personhood. The validators then bet with their power, in the consensus-by-bet game that Zamfir invented. Mining rewards are shared between validators, and the people they represent. "
Whitepaper: Proof-of-power, using a swarm to select miners through majority consensus
