Subcontract. Put out a call for tenders for other people to deliver the money in particular countries, or regions, or to particular demographics within regions.

Subcontract. Put out a call for tenders for other people to deliver the money in particular countries, or regions, or to particular demographics within regions. Choose the proposals which are satisfactorily reliable and at the cheapest price. There probably isn't a systematic way to get a dollar to everyone on earth. A mechanism which which works in the US won't necessarily work in India, Western Sahara, or the Netherlands. The best way to find a mechanism suited to local conditions is to get people with local knowledge to select it. I'd be interested to see the proposal for North Sentinel Island.