What PTrace collects
PTrace is a work tool for cooperatives and farms. It collects only what is needed to keep a signed farm journal and to trace a product batch.
Data the app handles
- Account: name, email and organisation you sign up or are invited with.
- Journal entries you write: work type, plot, materials, quantities, cost, notes, time.
- Field photos you attach, and the GPS position of an entry — only when you allow location access.
- The public keys of your device (used to verify signatures). Private keys stay in the phone's Keychain / Keystore and are never sent.
Permissions
Location (to stamp GPS on an entry), camera and photos (field pictures), notifications (task reminders). Each is optional and can be turned off in system settings.
Where it goes
Entries and photos sync to your cooperative's PTrace server. A fingerprint (Merkle root) of the entries is anchored on Calix Chain; the entries themselves are not put on the chain. When a batch is sealed, its QR page shows the batch's journal to anyone who scans the label — that is the purpose of traceability, so write nothing in a sealed batch you do not want a buyer to read.
Offline copy
Unsent entries and photos stay on the phone until the server accepts them. Signing out does not delete them.