I'd start with reading the Zanzibar Paper. We built an annotated version [1] that provides additional guidance on some of the denser sections and how we interpreted them.

Then, I'd take a look at the history of SpiceDB [2] for how we developed the system over time.

Finally, if you have any questions, feel free to jump into our Discord [3] and ask: we're happy to answer!

[1]: https://zanzibar.tech/ [2]: https://spicedb.io [3]: https://discord.gg/spicedb