Delivery, workshop, transfer and return come together in one unbroken history. One vehicle, one file.
The product is not the individual PDF, but an immutable file per vehicle (VIN) that grows over the entire lifecycle — every occurrence as a chained event backed by evidence.
Every occurrence is its own immutable record (inspection plus, optionally, transfer of responsibility). Together they form the unbroken history. Some processes are two-stage (pick-up plus return/handover with a before/after comparison).
Every completed record is sealed with a SHA-256 hash and added to the vehicle's hash chain. The smallest change to text or photo would alter the hash — and be noticed immediately. Signatures with name and time from the customer and the person handing over.