This NIP is not yet in main. Here is an overview of PRs referencing this NIP.
Push Notification - Event Watcher API OPEN @vitorpamplona
Read status 2 OPEN @staab
Adds Nostr Naming System (NNS) OPEN @vitorpamplona
NIP-97 Login with Nostr OPEN @Semisol
Add read status NIP CLOSED @staab
NIP-97: Files hosted on relay OPEN @ondra-novak
NIP-97 Attachments (binary content and media) CLOSED @ondra-novak
NIP-97 Event Recommendations CLOSED @vitorpamplona