Your view of nostr will always only be the events coming from the relays you connect to. Even if you use some of the aggregating services like Primal or Nostr.band, or incorporate outbox model, you still only see some cross section of all the events in existence “on Nostr.” It may be a large cross section, but it will never be the absolute entire set of events signed by a key on Nostr. On Bitcoin, every node has a full view of the entire chain of transactions, and it’s that way out of necessity because it’s money.  Nostr fits a different use case and neither needs or has a singular global state.