A single source of truth for the data? At least that’s my understanding from reading the summaries of technical ppl I trust who have reviewed it.
Even some technical ppl arguing in favor of BS have agreed there is currently a single data server.
Discussion
There are multiple data servers, my Bluesky account is self-hosted
I wrote an article comparing Bluesky and nostr once https://shreyanjain.net/2024/07/05/nostr-and-atproto.html