Sell your personal data yourself
As the name suggests, datacoin is a crypto coin that can hold data. But the idea for this one is different: The data associated with the coin is personal data. The way to mine this datacoin is by injecting it with personal data that you collect by tracking yourself - allowing you control over its value and whether you want to sell it or not - and what is and isn't tracked about you.
This would be a way to get a grasp over your own data and sell what you want to sell, or keep what you want to keep. Allowing you to make money yourself over the information that is about you. But that is one part of the story, the datacoin tool will also allow you another part of personal data that currently isn't really talked about: The insights that they hold.