Habit garden
Your habits turn into light.
Walk and focus to grow light. It gathers into orbs that ripen over a few hours. Gather them before friends take a drop. Grow your tree from seed to bloom, then plant a real one and get a certificate.
Real trees, checked by people
Every real tree is photographed where it stands and reviewed by a person. Each certificate has a public page that shows its photos and monthly check-ins, with its place shown to about 1 km.