Whether more items may be available after this page.
gRPC servers bound how much of the ledger a single request scans, so a scan-limited
query can return fewer items than limit (even none) with hasNextPage: true;
continuing from endCursor always makes progress through the scanned range.
Cursor at the first returned item. After a descending read of the most recent
items, pass as after to poll for items added since.
Cursor at the last returned item. Continue the query by passing it as
after(ascending) orbefore(descending).