Under the gold standard, we created paper money that was as good as gold. The US dollar is the gold that underlies the Greshm system.
The only way to implement basic income is by continually creating new money. Project Greshm has developed a mechanism to generate that money.
You will not have to "buy in" to participate. Greshm is free. We plan to organize the project as a nonprofit to manage Greshm for the benefit of everyone.