Mechanics of secondary markets

[michaelsbradleyjr]

In the team call on Feb 3, after discussing the subject of #61, we considered the possibility of secondary markets, e.g. futures. While there was general agreement that such markets are possible/natural, it was not immediately clear if/how the secondary markets "connect" to the primary marketplace, the latter characterized by concrete engagement per contract/s to store data for some fixed amount of time and subsequent uploading/downloading of that data.

We can explore those matters here.