I believe an anti-sybil accounts system would enable a new class of dapps to be built so I've enjoyed thinking about how this might be possible. Combining such an accounts system with, what might be the seed of, a basic income scheme, may have value as a way to incentivise participation and maintenance of the accounts system. After thinking about this potential interdependence between anti-sybil accounts and basic income I've put together a brief outline of how it might work as a github gist
and would love some feedback or collaboration on improving it. Gists can be forked so that would be one way to propose changes, or simply here, or as a comment to the gist.