Before revision:  Yet, a distributed construction of an online community which is bigger than the reach of personal acquaintances is strongly susceptible to sybils. This paper assumes that the community has some means for occasionally exposing sybils .
After revision:  We augment these building blocks with a mechanism that allows the community to maintain sovereignty over the economy, by making it sybil-resilient. To do so, we assume that the community has some means for occasionally exposing sybils .