The intercoin project was started with the aim of letting communities issue and control their own smart cryto currency, and seamlessly integrate it into apps. Same as Paypal, VISA network, Venmo, FB do. UBI becomes just an app on top of that.
Then community membership becomes a question of the community members or government. Harvard university knows who its students are. Other communities might make decisions via direct democracy (polling not voting).
intercoin.org