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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 )
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- [NIP-07: `window.nostr` capability for web browsers ](07.md )
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- [NIP-08: Handling Mentions ](08.md )
- [NIP-09: Event Deletion ](09.md )
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- [NIP-10: Conventions for clients' use of `e` and `p` tags in text events. ](10.md )
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- [NIP-11: Relay Information Document ](11.md )
- [NIP-12: Generic Tag Queries ](12.md )
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- [NIP-13: Proof of Work ](13.md )
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- [NIP-14: Subject tag in text events. ](14.md )
- [NIP-15: End of Stored Events Notice ](15.md )
- [NIP-16: Event Treatment ](16.md )
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- [NIP-22: Event created_at Limits ](22.md )
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- [NIP-25: Reactions ](25.md )
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- [NIP-28: Public Chat ](28.md )
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## Event Kinds
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| kind | description | NIP |
|-------------|-----------------------------|------------------------|
| 0 | Metadata | [1 ](01.md ), [5 ](05.md ) |
| 1 | Text | [1 ](01.md ) |
| 2 | Recommend Relay | [1 ](01.md ) |
| 3 | Contacts | [2 ](02.md ) |
| 4 | Encrypted Direct Messages | [4 ](04.md ) |
| 5 | Event Deletion | [9 ](09.md ) |
| 7 | Reaction | [25 ](25.md ) |
| 40 | Channel Creation | [28 ](28.md ) |
| 41 | Channel Metadata | [28 ](28.md ) |
| 42 | Channel Message | [28 ](28.md ) |
| 43 | Channel Hide Message | [28 ](28.md ) |
| 44 | Channel Mute User | [28 ](28.md ) |
| 45-49 | Public Chat Reserved | [28 ](28.md ) |
| 10000-19999 | Replaceable Events Reserved | [16 ](16.md ) |
| 20000-29999 | Ephemeral Events Reserved | [16 ](16.md ) |
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## Message types
### Client to Relay
| type | description | NIP |
|-------|-----------------------------------------------------|------------|
| EVENT | used to publish events | [1 ](01.md ) |
| REQ | used to request events and subscribe to new updates | [1 ](01.md ) |
| CLOSE | used to stop previous subscriptions | [1 ](01.md ) |
### Relay to Client
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| type | description | NIP |
|--------|---------------------------------------------------------|-------------|
| EVENT | used to send events requested to clients | [1 ](01.md ) |
| NOTICE | used to send human-readable messages to clients | [1 ](01.md ) |
| EOSE | used to notify clients all stored events have been sent | [15 ](15.md ) |
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Please update these lists when proposing NIPs introducing new event kinds.
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When experimenting with kinds, keep in mind the classification introduced by [NIP-16 ](16.md ).
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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.
