I did once write a system like that using libgit2 for the German Grundbuch (land registry): https://github.com/projekt-dgb/dgb-server/blob/master/API.md#upload

I did once write a system like that using libgit2 for the German Grundbuch (land registry): https://github.com/projekt-dgb/dgb-server/blob/master/API.md#upload https://github.com/projekt-dgb/dgb-server/blob/master/API.md... In the current system, rights, owners and debts of any land parcel in Germany are simply recorded in PDF files, with an ID for each parcel. So, when adding a "record", the govt employees literally just open the PDF file in a PDF editor and draw lines in the PDF, then save it again. Some PDF files are simply scanned pages of typewriter text (often even pre-WW2), so the lines are just added on top. It's a state-of-the-art "digital" workflow for our wonderful, modern country. Anyway, so I wrote an entire system to digitize it properly (using libtesseract + a custom verifying tool, one PDF file => one JSON file) and track changes to parcels using git. The system was also able to generate Änderungsmitteilungen (change notices) using "git diff" and automatically send them via E-Mail (or invoke a webhook to notify banks or other legal actors, that the parcel had changed - currently this is done using paper and letters). It was a really cool system (desktop digitizing tool + web server for data management), but the German government didn't care, although some called it "quite impressive". So it's now just archived on GitHub. Their current problem with "digitization" was that every state uses different formats and extra fields for the and they are still (after 20+ years) debating about what the "standardized" database schema should be (I tried to solve that with an open, extensible JSON schema, but nah [insert guy flying out of window meme]). I'm a one-man show, not a multi-billion dollar company, so I didn't have the "power" to change much. Instead, their "digital Grundbuch" (dabag) project is currently a "work in progress" for 20+ years: https://www.grundbuch.eu/nachrichten/ https://www.grundbuch.eu/nachrichten/ because 16 states cannot standardize on a unified DB scheme. So it's back to PDF files. Why change a working system, I guess. Germans, this is where your taxes are spent on - oh well, the project was still very cool.