By Tim ProchakGeospatial, Temporal, and Personal -We’ve been working hard building out our location-based content delivery platform. Critical to our system is the user’s ability to “check-in” at content delivery points and record that interaction for the user’s memory and potential future rewards for participation. We’ve tokenized this process through a consensus mechanism called Proof of Presence. Proof of Presence is an on-chain record of engagement that commemorates physical and digital ex...