I will add another dimension to this.

Whatever is possible in Nostr is possible in Pubky.

Not everything possible in Pubky is possible in Nostr.

Whatever schemes you deploy to achieve the features of Pubky won't be simpler or as resistant, but we could easily add signed event-based data and ofc we will have tools for syncing and mirroring.

Just change Nostr to PKARR, then we can fight about the data format later, man!