How to practically implement a project on the blockchain?

Question

Information Security

Where to start implementing a project on the blockchain, which should contain consistently entered information, the history of transactions, so that no one can ever change it. Only a closed circle of administrators has the right to enter information, and all information should be visible to everyone. By type - the history of car ownership, everyone sees, and only authorized traffic police can supplement (but not change) the history. What are the practical steps, where to start?