Put the biggest filter you can find into the system.
The filter (or shall we say obfuscator) would have to be on the mobile device itself.
But even then, this doesn't stop the weird feeling users are going to have:
"why is this wallet asking for access to my geolocation?"
"Ah ok, my location is safe, and I'm supposedly helping bitcoin miners by allowing spreadcoin to sell my data to merchants."
"But what do I have to win from this?"
I predict that no one is going to want to participate in this scheme, just to help bitcoin miners.
People can always choose to help miners directly.
The mere act of buying bitcoin regularly is what helps miners the most. Obviously.People are going to think that this "big data" scheme is like a
(be it voluntary) taxation charity scheme,
where a middleman (spreadcoin, not related to bitcoin miners) is selling something to merchants (again, not related to bitcoin miners)
so that finally some of the profit made along the way is being shared with the poor miners.
Doesn't sit right with me, if I heard it explained to me this way.
Holding personal data is a headache and generates regulatory issues. Don't want it. Don't want it. Don't want it.
I've said it many times before. Personal data: Don't want it.
That's the spirit!
See, anonymous data can be really useful and valuable.
Yes, that's why I still entertain the idea of decentralized big data, because I think it actually can be done in an anonymous way.
There is a way, we just have to find it.