what is the source for wealth distributed?
Is it depends on services/products given by same community members?
Yes, the value for the basic income comes from the group's activities, and this can include:
– Goods the group creates.
– Services the group offers.
– Even outside investment into the group (which can be accomplished through purchase of the group's tokens).
See these links for concrete examples:
http://groupcurrency.org/#Examples
http://groupcurrency.org/#FAQ (first FAQ item on “AcademicCoin”).
Could it be an hurdle for “unconditionally basic income?”
I'm not sure I understand what you mean by “hurdle”. All basic income systems require that there be enough value behind a group for the basic income to exist.
maybe it creates a central bank (for each group by the group members).
This too is not clear to me; not sure I understand what a central bank has to do with anything.