What exists? The Public Registry is the collection of accepted public records. The Index below is how you find a record inside it. Search only the metadata already held by the Registry.
/discover/data/ is this human Public Registry. /discover/data (without the trailing slash) remains the machine Registry API compatibility route.
Catalog chronology
Records are grouped by date to support browsing within the collection. The Registry shows what exists; The Ledger shows the chronology.