NIPs stand for Nostr Implementation Possibilities. They exist to document what may be implemented by Nostr-compatible relay and client software. Here is the documentation.
https://github.com/nostr-protocol/nips
Okay so NIPs are protocol proposals and It is up to the clients, relays and wallets to implement them independently?
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Relays and clients unless you are using a noncustodial wallet .
*custodial