Pi is a new digital currency developed by Stanford PhDs, with over 3.5 million members worldwide which can be mined on your phone.
PI aims to be the world's most widely used and distributed cryptocurrency. To achieve that goal, PI incentivizes its earliest members to make contributions that will ensure its success (e.g., securing and growing the network).
Earlier members mine at a higher rate to reward contributions to the network when they are most needed. Be one of them!