[dane-pgp]

A decentralised pseudonymous reputation system, so that your good-standing in one online community (platform/silo) can be visible to people in another online community.

The answer might involve some sort of web-of-trust solution, and storing proofs on a blockchain, but the hard problems are how to avoid Sybil Attacks and not exposing people's social graphs.

[d_silin]

Isn't it one of the goals of Urbit?

[dane-pgp]

I guess, but:

"Urbit OS is a completely new, carefully architected software stack: a VM, programming language, and kernel designed to run software for an individual."

Even solving an impossible problem shouldn't require all of that.

[iamstupidsimple]

Sure, but nobody knows how to use Urbit.