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Nowadays, vehicles odometer fraud is becoming a growing problem internationally, and is costing European consumers between 5.6 to 9.6 billion euros per year. This is partly due to the lack of unified vehicles life-cycle management, and to the fact that vehicles data are currently spread across multiple stakeholders that do not trust each other or collaborate together. In this paper, we propose a Blockchain- backed Vehicles Data and Processes Ledger framework to streamline the management of vehicles life-cycle and data history, and hence to provide more transparency and collaborations between the involved stakeholders. The architecture and lessons learned from the first implementation phase are discussed, followed by future research challenges.