Have a look at xyo network and their token xyo as a project, it has a good and active team and are coming up with oracle based location services based on blockchain, i find this project with real use cases as it can track and provide with real locations and can replace the centralized gps and maps due to its efficiency, transparwncy and multiple business use cases.
XYO network has a great idea, however, one problem I see right off the bat is the interface between the blockchain and the physical items. For example, let's use their "Pay-On-Delivery" use case. If, along the delivery route, someone took the tracker out of your package containing an iPhone and put it in one containing a small brick, you're still going to get billed when your iPhone--I mean your brick--arrives, as the blockchain only sees that the physical tracker was delivered, and not the iPhone itself.
And while XYO somewhat indirectly mentions the issue as they bring up the trackers they've been selling as a "find my lost/stolen bike/keys/etc", they never directly address this issue in the WP, although ironically, in the WP they quote an Ethereum developer who brings it up:
“Proof of Location you can trust is honestly one of the most difficult things to implement. Even if you have many participants that can attest each other’s location, there’s no guarantee that they wouldn’t just go sybil at any point in the future, and since you’re always only relying on majority reporting it’s a huge weakness. If you could require some type of specialized hardware device that has anti-tamper tech such that the private key is destroyed when one attempts to open it or change the firmware on it then you could possibly have greater security, but at the same time, it’s not like it’s impossible to spoof GPS signals either. A proper implementation of this requires so much fallback and so many different
data sources to have any assurance of accuracy, it would have to be very well funded project.” - Matt Di Ferrante, Developer, Ethereum Foundation (
https://www.reddit.com/r/ethereum/comments/539o9c/proof of location/ , September 17, 2016)
So until the problem of having trackers that can't be physically removed from the items they are tracking without destroying the signal/alerting the system to a possible tampering is addressed in a practical way, I don't see the XYO network ever being used on a broad scale.
