So far I've described the "spatial identification for coin delivery" process as requiring a smartphone or similar mobile internet device - i.e. needing at least GPS and internet connection and camera.
By 2020, smartphones will pretty much have displaced feature phones (though some large fraction of them may use WiFi for internet access) with around 80% of global population having one or more mobile internet devices. And that's before considering any impact on demand from TheCoin being implemented - which might create demand for extremely cheap devices specifically for TheCoin distribution and use.
But suppose we wish to enable near global distribution of TheCoin now - as soon as the software can get written? Phones at least capable of sending/receiving SMS are now in the hands of around 60% to 70% of global population. SMS messaging can be gotten very cheaply, once one gets away from the absurd "Wireless Plan" SMS pricing in places like the US.
Can we leverage SMS to get going sooner, at least in areas where smartphone penetration is low and poverty is high?
Instead of using GPS coordinates and photographs to reliably prove unique spatial identity, what if we use code exchanges between random recipients known to be in an area? Each locale will have commonly known local places, which could be entered into TheCoin network and used to generate walking instruction messages to get random pairs of people to meet and exchange codes. Once both parties have sent their codes, both would be sent directions to their next exchange point. This system is slightly less reliable, in if anyone abandons their walk, they will break the chain of location proof for the person they were to meet. A fall-back of allowing the abandoned person to try again with a location they haven't yet been to, should be sufficient to fix most of this.
The walking instructions might start with something like "Text back # of nearest location as starting point for TheCoin delivery: 1.Your Home. 2.Han's Bar. 3.Village well..." That will set the baseline of persons who are ready to receive TheCoin, along with their location, allowing generation of pairs of persons to exchange codes at nearby locations.
A bit later each ready recipient would get a message like: "Your ID is 8253. Go to Village well and find someone with ID 3549. Give that person code 2967. Message back the code they give you." Etc.
After 3-5 locations and completed exchanges, TheCoins would be deposited to their accounts. A total of about 8-12 (sent and received) messages, probably costing less than 50 cents total.
So how might people attempt to cheat this system?
They might collude to ignore directions and gather in a single spot to use multiple devices. That won't work for large towns and cities, but could work for tiny villages with very few people, which nonetheless happen to have SMS mobile phone service, but not WiFi or mobile broadband. Such places would tend to be poor - most people would have at most one device. Any who have multiple devices would have to agree to pay each person they cheat with, to gain their cooperation. So initially this would be a very tiny problem, benefiting the poorest, without having significant economic impact on TheCoin system overall.
Still, it'd be necessary to counter it eventually. Delays between code exchanges could be examined to look for odd variations in how long it takes recipients to get to exchange points. When it appears that cheating has become rampant, indicating that most will have gotten enough income to purchase more than one device, it can be assumed that the villagers can now afford mobile internet devices and WiFi, and switch that region over to the standard system. (Just knowing that this will happen will have some deterrent effect.)
Note that this latter deterrent need only be implemented for the small fraction of the world's population living in tiny villages, so it is not a large added cost, and is a feature that can be added some time after TheCoin system has become globally established.