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# NIPs
NIPs stand for **Nostr Implementation Possibilities** . They exist to document what MUST, what SHOULD and what MAY be implemented by [Nostr ](https://github.com/fiatjaf/nostr )-compatible _relay_ and _client_ software.
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- [NIP-01: Basic protocol flow description ](01.md )
- [NIP-02: Contact List and Petnames ](02.md )
- [NIP-03: OpenTimestamps Attestations for Events ](03.md )
- [NIP-04: Encrypted Direct Message ](04.md )
- [NIP-05: Mapping Nostr keys to DNS-based internet identifiers ](05.md )
- [NIP-06: Basic key derivation from mnemonic seed phrase ](06.md )
- [NIP-08: Handling Mentions ](08.md )
- [NIP-09: Event Deletion ](09.md )
- [NIP-11: Relay Information Document ](11.md )
- [NIP-12: Generic Tag Queries ](12.md )
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## Event Kinds
| kind | description | NIP |
|------|---------------------------|-----|
| 0 | Metadata | 5 |
| 1 | Text | 1 |
| 3 | Contacts | 2 |
| 4 | Encrypted Direct Messages | 4 |
| 5 | Event Deletion | 9 |
Please update this list when proposing NIPs introducing new event kinds.
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## Criteria for acceptance of NIPs
1. They should be implemented somewhere at least as a prototype somewhere.
2. They should make sense.
3. Other rules will be made up when necessary.
## License
All NIPs are public domain.
