A portable, owner-owned, local-first format for a lifelong foot-health record — a directory anyone can open, and any software can read or write. Like PDF or JPEG, but for your feet.
Directory layout, the day-chapter timeline, the receipt schema, and the normative "escalate-only + always-disclaim" safety rule. Free to implement.
The passport belongs to its owner. OpenFootLab is one implementation; the format is open so a clinic, a research tool, or a future app can read the same record.